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^ History
^ Engine Specifications (Diesel Propulsion)
^ ^ Diesel Engine Duty Ratings
^ Engine Specifications (Gasoline Propulsion)
^ Literature & Manuals
^ Forum Posts
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^ Tech Notes
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For over 75 years, Westerbeke has been offering durable and reliable power solutions to meet the challenges of commercial and recreational marine applications. We manufacture diesel and gasoline fueled generators, diesel propulsion engines, climate control systems and specialized sound enclosures.

Our products offer quiet operation, low vibration, long service life and superb value. And our track record for delivering industry-changing innovations has resulted in important advances in safety, as well as beneficial reductions in size, weight, noise, fuel consumption and exhaust emissions for both generators and propulsion engines.

Today, Westerbeke is recognized worldwide for the quality of our products — and for the outstanding service and warranty support we provide through a network of Master Distributors and dealers, covering every ocean and sea plus all the temperate continents.

More from Westerbeke: www.westerbeke.com/pages/about.htm

ΞPIXΞ

History

In 1937, John H. Westerbeke Sr. founded the Westerbeke Corporation as a company dedicated to the development of diesel engines and generators for a variety of uses. By 1938, Westerbeke was already pioneering use of the Detroit Diesel 6-71 for marine applications.

In 1959, the company started customizing Perkins engine blocks for marine applications, creating a market for small marine diesels among sailboaters seeking reliable and practical auxiliary power. The same engines were also used in marine diesel generators. In the 1980’s the company revolutionized the marine diesel market by introducing a new line of quiet, compact, lightweight and dependable generators that were the smallest available. In 2005, Westerbeke offered the first low carbon monoxide (Low-CO) gasoline generator for the marine market.

Currently, Westerbeke uses engines from several leading manufacturers to create marine-proven diesel and gasoline engines ranging from 12 to 66 horsepower, and generators ranging from 3.5 to 33.0 kilowatts. We also manufacture Universal diesel engines from 20 to 26 horsepower, and Rotary Aire marine climate control systems that offer self-contained efficiency in 10,000 BTU and 17,000 BTU models.

More from Westerbeke: www.westerbeke.com/pages/history.htm

More about Universal Motor Co.

ΞPIXΞ

General

Specifications For Westerbeke
4-Stroke Cycle Diesel Marine Engines
(by Ascending Horsepower)

TABLE KEY: (Table still under development)
DS = Data Source: (such as Webpages, DataSheets or SpecSheets, Catalogs, Manuals,+) with Links
^ __ = Source wLink, W… = Westerbeke, Ww = Westerbeke Webpage, Ws = Westerbeke SpecSheet
^ BD = BoatDiesel.com = …B, …d = Directory, …w = Webpage, …s = SpecSheet, …c = Catalog/Brochure,
^ …o = Operator’s Manual, …m = Service/Technical Manual, …1,2,3,A,B,C,etc = Source #, Version, Revision
⊗ = Data Not Available from Data Source, ? = …? = Data Not Confirmed
CYL = Cylinder Configuration-Number−Liner: I = In-Line, U = u… = Upright (Vertical)
^ Liner: W = Wet Liner(s), D = Dry Liner(s), WD = Combo Wet + Dry Liner(s),
^ ^ P = Parent/Native Bore (Determined from Service Manual & Parts List, S = Sleeved (Press fit?)
^ …mm = Millimeters, …in = Inches, …cc = Cubic Centimeters, …L = Litres (Liters), …ci = Cubic Inches
♣ = Base Engine Manufacturer, ♣ = Engine Mariniser (Marinizer)
MODEL: EC = Engine Code
RATING: See Engine Duty Ratings at end of this table.
ASP: N = Naturally Aspirated, T = Turbocharged, S = Supercharged
^ Ta = Turbocharged & Aftercooled, Ti = Turbocharged and Intercooled
^ …S = …s = w/Seawater Intercooler, …R = …r = w/Raw Water Intercooler
^ -INJ: M = Mechanical Injection, i = Integral Injector, Cr = Common Rail, E = Electronic Injection
KW = Kilowatts, HP = Horsepower, BHP = Brake Horsepower, MHP = Metric Horsepower
@RPM = Power Ratings @ Revolutions Per Minute
YEARS MFR’D: Beginning-Ending, Trailing “–” (Dash) without an Ending Date = Still in Production.
^ Data from Westerbeke Propulsion Model History (12/8/05) updated from Westerbeke Website.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3.00in	2.25in	⊗L / 15.90ci
Base Engine	Ws	U-1−⊗	⊗mm	⊗mm	3in	2.25in	⊗L / 15.9ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
DS 5 − ⊗	Wd	N	⊗	5	⊗	3000	1972?-1976?
DS 5 − Con	Ws	N	⊗	5	⊗	3000	1972?-1976?

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3.23in	2.17in	⊗L / 17.68ci
Base Engine	Ws	U-1−⊗	82mm	55mm	3.23in	2.17in	0.29L / 17.68ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	?-?

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
7A One − ⊗	Wd	N	⊗	6.4	⊗	3000	2000-2003
7A One − ⊗	Ws	N	4.7	6.4	⊗	3000	2000-2003

NOTES: Westerbeke Webpage. SpecSheet. OpManual. Parts Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3in	2 5/8in	⊗cc / 18.5ci
Base Engine	Ws	U-1−⊗	⊗mm	⊗mm	3in	2 5/8in	303cc / 18.5ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W7 − ⊗	Wd	N	⊗	7	⊗	3600	1976-1984
W7 − Con	Ws	N	⊗	7	⊗	3600	1976-1984

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3in	2 5/8in	⊗cc / 18.5ci
Base Engine	Ws	U-1−⊗	⊗mm	⊗mm	3in	2 5/8in	303cc / 18.5ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
DS 7 − ⊗	Wd	N	⊗	7	⊗	3600	1976-1984
DS 7 − Con	Ws	N	⊗	7	⊗	3600	1976-1984

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww‚Ws	uI-2−⊗	⊗mm	⊗mm	2.56in	2.68in	⊗L / 27.52ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 10 Two − ⊗	Wd	N	⊗	10	⊗	3600	1983-1987
W 10 Two − Con	Ws	N	⊗	9	⊗	3600	1983-1987
W 10 Two − Int	Ws	N	⊗	9.6	⊗	3600	1983-1987
W 10 Two − Max	Ws	N	⊗	10	⊗	3600	1983-1987

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3.34in	3.34in	⊗L / 29.4ci
Base Engine	Ws	U-1−⊗	⊗mm	⊗mm	3.35in	3.35in	⊗L / 29.4ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 10 − ⊗	Wd	N	⊗	10	⊗	3000	19??-19??
W 10 − Con	Ws	N	⊗	10	⊗	3000	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Formerly Pilot-10

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	3.74in	2.91in	⊗L / 32.00ci
Base Engine	Ws	U-1−⊗	95mm	74mm	3.74in	2.91in	0.524L / 31.95ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	?-?

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
11A One − ⊗	Wd	N	⊗	11	⊗	3000	2001-20??
11A One − ⊗	Ws	N	8	10.7	⊗	3000	2001-20??

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Installation Drawing 44923. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.56in	2.68in	⊗L / 27.52ci
Base Engine	Ws	uI-2−⊗	65mm	68mm	2.56in	2.68in	0.45L / 27.52ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
12B Two − ⊗	Wd	N	⊗	12	⊗	3000	1983-1992
12B Two − ⊗	Ws	N	⊗	12	⊗	3600	1983-1992

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Technical Manual. Wiring Diagram rev K. Wiring Diagram rev L. Wiring Diagram rev M. Wiring Diagram rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.99in	2.76in	⊗L / 38.80ci
Base Engine	Ws	uI-2−⊗	76mm	70mm	2.99in	2.76in	0.63L / 38.75ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-?

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
12C Two − ⊗	Wd‚Ws	N	⊗	12	⊗	3000	1992-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Bulletin 2010-2: Piston Wrist Pin Size Change 6/11/2010. Service Manual. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-2−⊗	⊗mm	⊗mm	⊗in	⊗in	0.63L / 39ci
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.99in	2.76in	⊗L / 38.75ci
Base Engine	Ws	uI-2−⊗	76mm	70mm	2.99in	2.76in	0.63L / 38.75ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
12D Two − ⊗	Wc	N	9.0	12	⊗	3000	20??-
12D Two − ⊗	Wd	N	⊗	12	⊗	3000	20??-
12D Two − ⊗	Ws	N	9.0	12	⊗	3000	20??-

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Bulletin 2010-2: Piston Wrist Pin Size Change 6/11/2010. Service Manual. Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.68in	3.07in	⊗L / 37.00ci
Base Engine	Ws	uI-2−⊗	68mm	78mm	2.68in	3.07in	0.566L / 37ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 13 − ⊗	Wd	N	⊗	13	⊗	3000	1980-1984
W 13 − ⊗	Ws	N	⊗	13.5	⊗	3000	1980-1984

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.68in	3.07in	⊗L / 37.00ci
Base Engine	Ws	uI-2−⊗	68mm	78mm	2.68in	3.07in	0.566L / 37ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 13A − ⊗	Wd	N	⊗	13	⊗	3000	1984-1988
W 13A − ⊗	Ws	N	⊗	13.5	⊗	3000	1984-1988

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww‚Ws	uI-2−⊗	⊗mm	⊗mm	3.15in	3.15in	⊗L / 50ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Pilot 50 − ⊗	Wd	N	⊗	15	⊗	2800	19??-19??
Pilot 50 − Con	Ws	N	⊗	12	⊗	2400	19??-19??
Pilot 50 − Max	Ws	N	⊗	15	⊗	2800	19??-19??

NOTES: Westerbeke Webpage. SpecSheet.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	2.478in	3.50in	⊗L / 58.00ci
Base Engine	Ws	uI-4−⊗	⊗mm	⊗mm	2.478in	3.5in	⊗L / 58ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-60 − ⊗	Wd	N	⊗	15	⊗	2500	1971-1979
4-60 − ⊗	Ws	N	⊗	15	⊗	2500	1971-1979

NOTES: Westerbeke Webpage. SpecSheet. Technical Manual & Parts List.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-2−⊗	⊗mm	⊗mm	2.99in	2.76in	⊗L / 38.75ci
Base Engine	Ws	uI-2−⊗	76mm	70mm	2.99in	2.76in	0.63L / 38.75ci
Base Engine	Wo‚m	uI-2−⊗	76mm	70mm	2.99in	2.76in	0.635L / 38.75ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
20B Two − ⊗	Wd	N	⊗	18	⊗	3600	1987-20??
20B Two − ⊗	Ws	N	13.4	18	⊗	3600	1987-20??
20B Two − Max	Wo‚m	N	⊗	18	⊗	3600	1987-20??

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.40in	3.05in	⊗L / 48.00ci
Base Engine	Ws	uI-3−⊗	65mm	78mm	2.4in	3.05in	0.78L / 48ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 18 − ⊗	Wd	N	⊗	18	⊗	3300	1985-1989
W 18 − ⊗	Ws	N	⊗	18	⊗	3300	1985-1989

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww‚Ws	uI-2−⊗	⊗mm	?mm	3.35in	3.35in	⊗L / 58.8ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 20 − ⊗	Wd	N	⊗	20	⊗	3000	19??-19??
W 20 − ⊗	Ws	N	⊗	20	⊗	3000	19??-19??

NOTES: Westerbeke Webpage. SpecSheet.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.87in	3.07in	⊗L / 60.00ci
Base Engine	Ws	uI-3−⊗	73mm	78mm	2.87in	3.07in	0.98L / 60ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 21 − ⊗	Wd	N	⊗	21	⊗	3000	1980-1984
W 21 − ⊗	Ws	N	⊗	22?	⊗	3000	1980-1984

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.87in	3.07in	⊗L / 60.00ci
Base Engine	Ws	uI-3−⊗	73mm	78mm	2.87in	3.07in	0.98L / 60ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 21A − ⊗	Wd	N	⊗	21	⊗	3000	1984-1987
W 21A − ⊗	Ws	N	⊗	22	⊗	3000	1984-1987

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.19in	3.06in	⊗L / 97.60ci
Base Engine	Ws	uI-4−⊗	81mm	77.6mm	3.189in	3.055in	⊗L / 97.6ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
L-25 − ⊗	Wd	N	⊗	22	⊗	2400	1975-1978
L-25 − ⊗	Ws	N	⊗	22	⊗	2400	1975-1978

NOTES: Westerbeke Webpage. SpecSheet. Technical Manual & Parts List.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.87in	3.07in	⊗L / 60.00ci
Base Engine	Ws	uI-3−⊗	73mm	78mm	2.87in	3.07in	0.98L / 60ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
RD 60 − ⊗	Wd	N	⊗	22	⊗	3000	19??-19??
RD 60 − ⊗	Ws	N	⊗	22	⊗	3000	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
British Leyland 4-91	Ww	uI-4−⊗	⊗mm	⊗mm	2.80in	3.5in	⊗L / 91.00ci
British Leyland 4-91	Ws	uI-4−⊗	⊗mm	⊗mm	2 7/8in	3½in	⊗L / 91ci

♣ BRITISH LEYLAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣? PERKINS?
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1969-1975

NOTES: Westerbeke Webpage. ~~SpecSheet. Installation Drawing. Operator’s Manual.~~ Parts List (from L-36). ~~Parts Manual. Service Manual. Technical Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C~~.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
British Leyland 4-91	Ww	uI-4−⊗	⊗mm	⊗mm	2.80in	3.5in	⊗L / 91.00ci
British Leyland 4-91	Ws	uI-4−⊗	⊗mm	⊗mm	2 7/8in	3½in	⊗L / 91ci

♣ BRITISH LEYLAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣? PERKINS?
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 30 − ⊗	Wd	N	⊗	25	⊗	2500	1975-1981
W 30 − ⊗	Ws	N	⊗	25	⊗	2500	1975-1981

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual. Formerly 4-91.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-3−⊗	⊗mm	⊗mm	⊗in	⊗in	0.95L / 58ci
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.99in	2.76in	0.95L / 58.09ci
Base Engine	Ws	uI-3−⊗	76mm	70mm	2.99in	2.76in	0.95L / 58.09ci
Base Engine	Wo	uI-3−⊗	76mm	70mm	2.99in	2.76in	0.952L / 59.09ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
30C Three − ⊗	Wc	N	18.7	25	⊗	3600	20??-
30C Three − ⊗	Wd	N	⊗	25	⊗	3600	20??-
30C Three − ⊗	Ws	N	18.7	25	⊗	3600	20??-
30C Three − Max	Wo	N	⊗	25	⊗	3600	20??-

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Technical Manual. Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	2.87in	3.07in	⊗L / 80.00ci
Base Engine	Ws	uI-4−⊗	73mm	78mm	2.87in	3.07in	1.3L / 80ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 27 − ⊗	Wd	N	⊗	27	⊗	3000	1980-1984
W 27 − ⊗	Ws	N	⊗	30	⊗	3000	1980-1984

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.99in	2.76in	0.95L / 58.09ci
Base Engine	Ws	uI-3−⊗	76mm	70mm	2.99in	2.76in	0.95L / 58.09ci
Base Engine	Wo‚m	uI-3−⊗	76mm	70mm	2.99in	2.76in	0.952L / 59.09ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
30B Three − ⊗	Wd	N	⊗	27	⊗	3600	1987-20??
30B Three − ⊗	Ws	N	20	27	⊗	3600	1987-20??
30B Three − Max	Wo‚m	N	⊗	27	⊗	3600	1987-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-3−⊗	⊗mm	⊗mm	⊗in	⊗in	1.32L / 80ci
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	3.07in	3.62in	⊗L / 80.43ci
Base Engine	Ws	uI-3−⊗	78mm	92mm	3.07in	3.62in	1.318L / 80.43ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
35E Three − ⊗	Wc	N	20.9	28	⊗	3000	20??-
35E Three − ⊗	Wd	N	⊗	28	⊗	3000	20??-
35E Three − ⊗	Ws	N	20.9	28	⊗	3000	20??-

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	3.07in	3.62in	⊗L / 80.43ci
Base Engine	Ws	uI-3−⊗	78mm	92mm	3.07in	3.62in	1.318L / 80.42ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
35C Three − ⊗	Wd	N	⊗	29	⊗	3600	2000-2002
35C Three − ⊗	Ws	N	⊗	29	⊗	3600	2000-2002

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Callout Drawing (7/6/10). Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	2.87in	3.07in	80.00ci
Base Engine	Ws	uI-4−⊗	73mm	78mm	2.87in	3.07in	1.3L / 80ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 27A − ⊗	Wd	N	⊗	30	⊗	3000	1984-1988
W 27A − Con	Ws	N	⊗	32?	⊗	3000	1984-1988
W 27A − Int	Ws	N	⊗	30	⊗	3000	1984-1988
W 27A − Max	Ws	N	⊗	27?	⊗	3000	1984-1988

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	2.87in	3.07in	⊗L / 60.00*ci
Base Engine	Ws	uI-4−⊗	73mm	78mm	2.87in	3.07in	1.3L / 80ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
RD 80 − ⊗	Wd	N	⊗	30	⊗	3000	19??-19??
RD 80 − ⊗	Ws	N	⊗	30	⊗	3000	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Service Manual. *60.00ci Displacement appears to be an error, should read 80.00ci. 3 cyliner RD 60 is 60.00ci.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.07in	3.07in	⊗L / 91.00ci
Base Engine	Ws	uI-4−⊗	78mm	78mm	3.07in	3.07in	1.490L / 91ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 33A − ⊗	Wd	N	⊗	31	⊗	3000	1984-1988
W 33A − Usable	Ws	N	⊗	21	⊗	2000	1984-1988
W 33A − Con	Ws	N	⊗	28*	⊗	3000	1984-1988
W 33A − Usable	Ws	N	⊗	31	⊗	3000	1984-1988
W 33A − Int	Ws	N	⊗	32*	⊗	3000	1984-1988
W 33A − Max	Ws	N	⊗	33	⊗	3000	1984-1988

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. *BHP from SpecSheet Performance Curve.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−P	⊗mm	⊗mm	3.07in	3.62in	⊗L / 80.43ci
Base Engine	Ws	uI-3−P	78mm	92mm	3.07in	3.62in	1..318L / 80.43ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
35D Three − ⊗	Wd	N	⊗	31	⊗	3000	2002-20??
35D Three − ⊗	Ws	N	23	31	⊗	3000	2002-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Callout Drawing 54700. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−P	⊗mm	⊗mm	3.07in	3.07in	⊗L / 68.20ci
Base Engine	Ws	uI-3−P	78mm	78mm	3.07in	3.07in	1.118L / 68.23ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
35B Three − ⊗	Wd	N	⊗	32	⊗	3600	1987-2000
35B Three − ⊗	Ws	N	23.8	32	⊗	3600	1987-2000

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−P	⊗mm	⊗mm	3.07in	3.07in	⊗L / 91.00ci
Base Engine	Ws	uI-4−P	78mm	78mm	3.07in	3.07in	1.490L / 91.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 33 − ⊗	Wd	N	⊗	33	⊗	3000	1980-1984
W 33 − Con	Ws	N	⊗	28*	⊗	3000	1980-1984
W 33 − Int	Ws	N	⊗	32*	⊗	3000	1980-1984
W 33 − Max	Ws	N	⊗	33	⊗	3000	1980-1984

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. *BHP from SpecSheet Performance Curve.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ds	uI-?−⊗	⊗mm	⊗mm	?in	?in	?L / ?ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
LB49 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Manual. Service Manual. Technical Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
British Leyland 4-91	Ww	uI-4−⊗	⊗mm	⊗mm	2.80in	3.5in	⊗L / 91.00ci
British Leyland 4-91	Ws	uI-4−⊗	⊗mm	⊗mm	2 7/8in	3½in	⊗L / 91ci

♣ BRITISH LEYLAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣? PERKINS?
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-91 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1969-1975

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Perkins 4.99	Ww	uI-4−W	⊗mm	⊗mm	3.00in	3.50in	⊗L / 99.00ci
Perkins 4.99	Ws	uI-4−W	⊗mm	⊗mm	3.00in	3.50in	⊗L / 99ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.99 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-99 − ?	Wd	N	?	34	?	3000	1960-1963
4-99 − Con	Ws	N	?	33	?	3000	1960-1963
4-99 − Int	Ws	N	?	40	?	3600	1960-1963

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−P	⊗mm	⊗mm	2.87in	3.07in	⊗L / 79.64ci
Base Engine	Ws	uI-4−P	73mm	78mm	2.87in	3.07in	1.305L / 79.64ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
38B Four − ⊗	Wd	N	⊗	37	⊗	3600	1987-2001
38B Four − ⊗	Ws	N	⊗	37	⊗	3600	1987-2001

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗in	1.76L / 107ci
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.07in	3.62in	⊗L / 107.27ci
Base Engine	Ws	uI-4−⊗	78mm	92mm	3.07in	3.62in	1.758L / 107.27ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
44C Four − ⊗	Wc	N	28.3	38	⊗	3000	20??-
44C Four − ⊗	Wd	N	⊗	38	⊗	3000	20??-
44C Four − ⊗	Ws	N	28.3	38	⊗	3000	20??-

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Callout Drawing 54694 (7/6/20). Service Manual. Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−D	⊗mm	⊗mm	3.13in	3.50in	⊗L / 107.00ci
Perkins 4.108	Ws	uI-4−D	⊗mm	⊗mm	3.125in	3.50in	⊗L / 107.00ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.108 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 40A − ⊗	Wd	N	⊗	37	⊗	3000	1978?-1990?
W 40A − ⊗	Ws	N	⊗	37	⊗	3000	1978?-1990?

NOTES: Westerbeke Webpage. SpecSheet.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Perkins 4.?	Ww	uI-4−W?‚D?	⊗mm	⊗mm	3.13in	3.50in	⊗L / 107.00ci
Perkins 4.107?	Ws	uI-4−W	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci
Perkins 4.108?	Ws	uI-4−D	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci
Perkins 4.99	Wm	uI-4−W	76.2mm	88.9mm	3.00in	3.50in	1.621L / 99.00ci
Perkins 4.107	Wm	uI-4−W	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci
Perkins 4.108	Wm	uI-4−D	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.99 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
4.107 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
4.108 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 40 − ⊗	Wd	N	⊗	37	⊗	3000	1978-1990
W 40 − Con	Ws	N	⊗	37	⊗	3000	1978-1990
W 40 − Max	Ws	N	⊗	40	⊗	3000	1978-1990

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wm	uI-4−⊗	79.37mm	88.90mm	3.125in	3.5in	1.760L / 107.4ci
Perkins 4.107?	Wm?	uI-4−W	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci
Perkins 4.108?	Wm?	uI-4−D	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.107? 8? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
40NA − ⊗	Wm	N	⊗	37	⊗	3000	1985-1990

NOTES: Data from OpManual.
NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Manual. Service Manual. Technical Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.07in	3.62in	⊗L / 107.27ci
Base Engine	Ws	uI-4−⊗	78mm	92mm	3.07in	3.62in	1.758L / 107.27ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
44A Four − ⊗	Wd	N	⊗	40	⊗	3600	1999-2002
44A Four − ⊗	Ws	N	29	40	⊗	3600	1999-2002

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Callout Drawing 54694. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ds	uI-?−?	?mm	?mm	?in	?in	?L / ?ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.107 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
14088B Navy − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Perkins 4.107	Ww	uI-4−W	⊗mm	⊗mm	3.13in	3.50in	⊗L / 107.00ci
Perkins 4.107	Ws	uI-4−W	⊗mm	⊗mm	3.13in	3.50in	⊗L / 107.00ci
Perkins 4.107	Wm	uI-4−W	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.107 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-107 − ⊗	Ww	N	⊗	40	⊗	3000	1963-1975
4-107 − Con	Ws	N	⊗	36*	⊗	3000	1963-1975
4-107 − ⊗	Ws	N	⊗	40	⊗	3000	1963-1975
4-107 − NMI	Ws	N	⊗	45*	⊗	3600	1963-1975
4-107 − SPRM	Ws	N	⊗	47*	⊗	4000	1963-1975

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Service Manual. *BHP from SpecSheet Performance Curve.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Perkins 4.108	W?	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗in	1.760L / 108ci
Perkins 4.108	Wm	uI-4−D	79.37mm	88.9mm	3.125in	3.5in	1.760L / 107.4ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.108 − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-108 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1975-1978

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−P?	⊗mm	⊗mm	3.16in	3.50in	⊗L / 110.00ci
Base Engine	Ws	uI-4−P?	⊗mm	⊗mm	3-5/32in	3½in	⊗L / 110ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 50 − ⊗	Wd	N	⊗	41	⊗	3200	1977-1979
W 50 − Con	Ws	N	⊗	41	⊗	3200	1977-1979
W 50 − Max	Ws	N	⊗	45*	⊗	3200	1977-1979

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Technical Manual. *BHP from SpecSheet Performance Curve.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.07in	3.07in	⊗L / 90.93ci
Base Engine	Ws	uI-4−⊗	78mm	78mm	3.07in	3.07in	1.49L / 90.93ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
42B Four − ⊗	Wd	N	⊗	42	⊗	3600	1987-1999
42B Four − ⊗	Ws	N	31.3	42	⊗	3600	1987-1999

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Mitsubishi? MVXL01.8?	Ww	uI-4−⊗	⊗mm	⊗mm	3.07in	3.62in	?L / 107.27ci
Mitsubishi? MVXL01.8?	Ws	uI-4−⊗	78mm	92mm	3.07in	3.62in	1.758L / 107.27ci

♣ MITSUBISHI?
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
MVXL01.8? − ⊗	es	N	⊗	41	⊗	3000	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
44B Four − ⊗	Wd	N	⊗	44	⊗	3000	2002-20??
44B Four − ⊗	Ws	N	32	44	⊗	3000	2002-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Callout Drawing 54694 (7/16/10). Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−D	⊗mm	⊗mm	3.30in	3.70in	⊗L / 127.00ci
Base Engine	Ws	uI-4−D	⊗mm	⊗mm	3.3in	3.7in	⊗L / 128ci
Base Engine	Ws	uI-4−D	84mm	94⊗mm	3.307in	3.701in	2084cc / 127.1ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 46 − ⊗	Wd	N	⊗	46	⊗	3000	1985-1990
W 46 − CRPO	Ws	N	⊗	30	⊗	2000	1985-1990
W 46 − CRPO	Ws	N	⊗	37	⊗	2500	1985-1990
W 46 − CRPO	Ws	N	⊗	42	⊗	3000	1985-1990
W 46 − URPO	Ws	N	⊗	34	⊗	2000	1985-1990
W 46 − URPO	Ws	N	⊗	42	⊗	2500	1985-1990
W 46 − URPO	Ws	N	⊗	46	⊗	3000	1985-1990
W 46 − Max	Ws	N	⊗	64	⊗	3800	1985-1990

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram 033685 Rev B (7/12/12). Wiring Diagram 036467 Rev B (7/12/12).

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗in	2.18L / 133ci
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.35in	3.78in	⊗L / 133.00ci
Base Engine	Ws	uI-4−⊗	85mm	96mm	3.35in	3.78in	2.18L / 133.0ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
55D Four − ⊗	Wc	N	35.9	48	⊗	2600	20??-
55D Four − ⊗	Wd	N	⊗	48	⊗	2600	20??-
55D Four − ⊗	Ws	N	35.9	48	⊗	2600	20??-

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List (Parts Callout Drawing). Service Manual. Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	3.51in	?L / 134.80ci
Base Engine	Ws	uI-4−⊗	⊗mm	⊗mm	3.50in	3.51in	?L / 134.8ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 52 − ⊗	Wd	N	⊗	52	⊗	3000	1981-1990
W 52 − ⊗	Ws	N	⊗	52	⊗	⊗	1981-1990
W 52 − Con	Ws	N	⊗	30	⊗	2000	1981-1990
W 52 − Con	Ws	N	⊗	45	⊗	3000	1981-1990
W 52 − Con	Ws	N	⊗	56	⊗	4000	1981-1990
W 52 − Int	Ws	N	⊗	35	⊗	2000	1981-1990
W 52 − Int	Ws	N	⊗	53	⊗	3000	1981-1990
W 52 − Int	Ws	N	⊗	66	⊗	4000	1981-1990

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Perkins 4.154	Ds	uI-4−D	⊗mm	⊗mm	⊗in	⊗in	⊗L / 154ci
Perkins 4.154	Pm	uI-4−D	89.9mm	101.6mm	3.5in	4.0in	2.523L / 153.9ci

♣ PERKINS
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4.154 − Con	Pm	N	⊗	55	⊗	3000	19??-19??
4.154 − Int	Pm	N	⊗	70	⊗	3600	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-154 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1972-1977

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Manual. Perkins Parts Manual. Service Manual. Technical Manual. Perkins Workshop Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
? 4.154	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	4.00in	⊗L / 154.20ci
? 4.154	Ws	uI-4−⊗	89mm	101.6mm	3.50in	4.00in	⊗L / 154.20ci
? 4.154	Wm	uI-4−⊗	89mm	101.6mm	3.50in	4.00in	2520cc / 154.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 60 − ⊗	Wd	N	⊗	53	⊗	2500	1977-1980
W 60 − Con	Ws	N	⊗	48	⊗	2500	1977-1980
W 60 − Int	Ws	N	⊗	53	⊗	2500	1977-1980
W 60 − Int	Ws	N	⊗	60	⊗	3000	1977-1980
W 60 − Con	Wm	N	⊗	53	⊗	2500	1977-1980
W 60 − Int	Wm	N	⊗	60	⊗	3000	1977-1980

NOTES: Westerbeke Webpage. SpecSheet. Parts List. Service Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−D	⊗mm	⊗mm	3.38in	3.70in	⊗L / 133.20ci
Base Engine	Ws	uI-4−D	86.0mm	94.0mm	3.38in	3.70in	2.18L / 133.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
55A Four − ⊗	Wd	N	⊗	55	⊗	3600	1995-2002
55A Four − ⊗	Ws	N	41	55	⊗	3600	1995-2002

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.35in	3.78in	⊗L / 133.00ci
Base Engine	Ws	uI-4−⊗	85mm	96mm	3.35in	3.78in	2.18L / 133ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
55C Four − ⊗	Wd	N	⊗	55	⊗	3000	2005-20??
55C Four − ⊗	Ws	N	40	55	⊗	3000	2005-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts List (Parts Callout Drawing). Service Manual, Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.35in	3.78in	⊗L / 133.20ci
Base Engine	Ws	uI-4−⊗	85mm	96mm	3.35in	3.78in	2.18L / 133.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
55B Four − ⊗	Wd	N	⊗	55	⊗	3000	2002-2005
55B Four − ⊗	Ws	N	40	55	⊗	3000	2002-2005

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
? 4.154	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	4.00in	⊗L / 154.00ci
? 4.154	Ws	uI-4−⊗	⊗mm	⊗mm	3.50in	4.00in	⊗L / 154.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 58 − ⊗	Wd	N	⊗	58	⊗	3000	1981-1991
W 58 − ⊗	Ws	N	⊗	58	⊗	⊗	1981-1991
W 58 − Con	Ws	N	⊗	38	⊗	2000	1981-1990
W 58 − Con	Ws	N	⊗	46.9	⊗	2500	1981-1990
W 58 − Con	Ws	N	⊗	52.8	⊗	3000	1981-1990
W 58 − Int	Ws	N	⊗	44.8	⊗	2000	1981-1990
W 58 − Int	Ws	N	⊗	55.2	⊗	2500	1981-1990
W 58 − Int	Ws	N	⊗	62	⊗	3000	1981-1990
W 58 − ⊗	Ws	N	⊗	69	⊗	3600	1981-1990

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	3.51in	⊗L / 134.80ci
Base Engine	Ws	uI-4−⊗	88.9mm	89.1mm	3.50in	3.51in	2.21L / 134.8ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
63B Four − ⊗	Wd	N	⊗	63	⊗	3600	1990-1994
63B Four − ⊗	Ws	N	⊗	63	⊗	3600	1990-1994

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	3.51in	⊗L / 134.80ci
Base Engine	Ws	uI-4−⊗	88.9mm	89.1mm	3.50in	3.51in	2.21L / 134.8ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
63C Four − ⊗	Wd	N	⊗	63	⊗	3600	1994-2000
63C Four − ⊗	Ws	N	47	63	⊗	3600	1994-2000

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.60in	3.50in	⊗L / 144.40ci
Base Engine	Ws	uI-4−⊗	92mm	89mm	3.6in	3.5in	2.32L / 144.4ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
63D Four − ⊗	Wd	N	⊗	61	⊗	4000	2001-2003
63D Four − ⊗	Ws	N	46	61	⊗	4000	2001-2003

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.74in	4.13in	⊗L / 182.00ci
Base Engine	Ws	uI-4−⊗	95mm	105mm	3.74in	4.13in	2.977L / 182.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
64A Four − ⊗	Wd	N	⊗	64⊗	2600	2003-20??
64A Four − ⊗	Ws	N	47	64	⊗	2600	2003-20??

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts Callout Drawing. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Wc	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗	3.62L / 221ci
Base Engine	Ws	uI-4−⊗	98mm	120mm	3.86in	4.72in	3.62L / 220.90ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
65B Four − ⊗	Wc	N	49.2	66	⊗	2600	19??-19??
65B Four − ⊗	Wd	N	⊗	66	⊗	2600	19??-19??
65B Four − ⊗	Ws	N	49.2	66	⊗	2600	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing 53998. Operator’s Manual. Parts Callout Drawing. Service Manual. Wiring Diagram Rev M,

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.86in	4.33in	⊗L / 202.50ci
Base Engine	Ws	uI-4−⊗	98.0mm	110.0mm	3.86in	4.33in	3.3L / 202.5ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
65A Four − ⊗	Wd	N	⊗	68	⊗	2600	19??-19??
65A Four − ⊗	Ws	N	50.7	68	⊗	2600	19??-19??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts Callout Drawing (7/29/11). Parts Callout Drawing (6/26/14). Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	95.00*in	105.00*in	⊗L / 182.00ci
Base Engine	Ws	uI-4−⊗	95mm	105mm	3.74in	4.13in	2.977L / 182.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 70 − ⊗	Wd	N	⊗	70	⊗	3000	1982-1991
W 70 − ⊗	Ws	N	⊗	70	⊗	⊗	1982-1991
W 70 − Con	Ws	N	⊗	49	⊗	2000	1982-1991
W 70 − Con	Ws	N	⊗	59	⊗	2500	1982-1991
W 70 − Con	Ws	N	⊗	62	⊗	3000	1982-1991
W 70 − Int	Ws	N	⊗	57.5	⊗	2000	1982-1991
W 70 − Int	Ws	N	⊗	69	⊗	2500	1982-1991
W 70 − Int	Ws	N	⊗	73	⊗	3000	1982-1991
W 70 − Max	Ws	N	⊗	78	⊗	3800	1982-1991

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
? 4.154	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	4.00in	⊗L / 154.00ci
? 4.154	Ws	uI-4−⊗	88.9mm	101.6mm	3.50in	4.00in	2.5L / 154.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
71B Four − ⊗	Wd	N	⊗	71	⊗	3600	1991-1994
71B Four − ⊗	Ws	N	⊗	71	⊗	3600	1991-1994

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.50in	4.00in	⊗L / 154.00ci
? 4.154	Ws	uI-4−⊗	88.9mm	101.6mm	3.50in	4.00in	2.5L / 154.0ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
71C Four − ⊗	Wd	N	⊗	71⊗	3600	1994-20??
71C Four − ⊗	Ws	N	52	71	⊗	3600	1994-20??

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.86in	4.92in	⊗L / 230.00ci
Base Engine	Ws	uI-4−⊗	98mm	125mm	3.86in	4.92in	⊗L / 230.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 80 − ⊗	Wd	N	⊗	75	⊗	2600	1978-1982
W 80 − ⊗	Ws	N	⊗	75	⊗	2600	1978-1982

NOTES: Westerbeke Webpage. SpecSheet. Parts List.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 262.00ci
Base Engine	Ws	uI-4−⊗	105mm	125mm	4.13in	4.92in	4.3L / 262ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 80-N4 − ⊗	Wd	N	⊗	80	⊗	2500	2001-2004
Century 80-N4 − ⊗	Ws	N	59	80	⊗	2500	2001-2004

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts Callout Drawing. Service Manual. Wiring Diagram Rev A.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.74in	4.13in	⊗L / 182.00ci
Base Engine	Ws	uI-4−⊗	95mm	105mm	3.74in	4.13in	2.977L / 182ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
82B Four − ⊗	Wd	N	⊗	82	⊗	3600	1991-20??
82B Four − ⊗	Ws	N	⊗	82	⊗	3600	1991-20??

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.94in	4.33in	⊗L / 210.80ci
Base Engine	Ws	uI-4−⊗	100.1mm	110mm	3.94in	4.33in	3.5L / 210.8ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
90A Four − ⊗	Wd	N	⊗	90	⊗	3600	1999-20??
90A Four − ⊗	Ws	N	67	90	⊗	3600	1999-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Parts List. Service Manual. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
?	Ds	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗in	⊗L / 230ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
4-230 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1972-1978

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ws	uI-6−⊗	⊗mm	⊗mm	3.62in	4.00in	⊗L / 247.20ci
Base Engine	Ws	uI-6−⊗	⊗mm	⊗mm	3.62in	4in	4.0521L / 247.20ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 100 − ⊗	Wd	N	⊗	100	⊗	3000	1982-1991
W 100 − ⊗	Ws	N	⊗	100	⊗	3000?	1982-1991
W 100 − Con	Ws	N	⊗	63.8	⊗	2000	1982-1991
W 100 − Con	Ws	N	⊗	77	⊗	2500	1982-1991
W 100 − Con	Ws	N	⊗	87.6	⊗	3000	1982-1991
W 100 − Int	Ws	N	⊗	75	⊗	2000	1982-1991
W 100 − Int	Ws	N	⊗	90.5	⊗	2500	1982-1991
W 100 − Int	Ws	N	⊗	103	⊗	3000	1982-1991

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Technical Manual.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ws	uI-6−⊗	⊗mm	⊗mm	3.62in	4.00in	⊗L / 247.20ci
Base Engine	Ws	uI-6−⊗	91.9mm	101.6mm	3.62in	4.00in	4.05L / 247.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
108B Six − ⊗	Wd	N	⊗	108	⊗	3600	1991-1994
108B Six − ⊗	Ws	N	⊗	108	⊗	3600	1991-1994

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ws	uI-6−⊗	⊗mm	⊗mm	3.62in	4.00in	⊗L / 247.20ci
Base Engine	Ws	uI-6−⊗	91.9mm	⊗mm	3.62in	4.00in	4.05L / 247.2ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
108C − ⊗	Wd	N	⊗	108	⊗	3600	1994-20??
108C − ⊗	Ws	N	⊗	108	⊗?	3600	1994-20??

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts List. Wiring Diagram Rev J. Wiring Diagram Rev K, Wiring Diagram Rev L. Wiring Diagram Rev M, Wiring Diagram Rev N.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 262.00ci
Base Engine	Ws	uI-4−⊗	105mm	125mm	4.13in	4.92in	4.3L / 262ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 110-T4 − ⊗	Wd	T	⊗	110	⊗	2400	2001-2004
Century 110-T4 − ⊗	Ws	T	82	110	⊗	2400	2001-2004

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts Callout Drawing. Service Manual. Wiring Diagram 044781. Wiring Diagram Rev A.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ws	uI-6−⊗	⊗mm	⊗mm	3.96in	4.92in	⊗L / 345.30ci
Base Engine	Ws	uI-6−⊗	98mm	125mm	3.86in	4.92in	⊗L / 345.3ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 120 − ⊗	Wd	N	⊗	115	⊗	2600	1978-1982
W 120 − ⊗	Ws	N	⊗	115	⊗	2600	1978-1982

NOTES: Westerbeke Webpage. SpecSheet. Parts List.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
?	Ds	uI-6−⊗	⊗mm	⊗mm	⊗in	⊗in	⊗L / 346ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
6-346 − ⊗	Ds	N	⊗	⊗	⊗	⊗	1972-1978

NOTES: Westerbeke Webpage, SpecSheet. Installation Drawing. Operator’s Manual. Parts List. Parts Manual. Service Manual. Technical Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-6−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 396.00ci
Base Engine	Ws	uI-6−⊗	105mm	125mm	4.13in	4.92in	6.5L / 396ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 120-N6 − ⊗	Wd	N	⊗	120	⊗	2500	2001-2005
Century 120-N6 − ⊗	Ws	N	89	120	⊗	2500	2001-2005

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts Callout Drawing. Service Manual. Wiring Diagram Rev A.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 264.00ci
Base Engine	Ws	uI-4−⊗	105mm	125mm	4.13in	4.92in	4.3L / 264.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 120-T4A − ⊗	Wd	T	⊗	126	⊗	2400	2005-20??
Century 120-T4A − ⊗	Ws	T	93	126	⊗	2400	2005-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts Callout Drawing. Wiring Diagram Rev A.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-6−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 396.00ci
Base Engine	Ws	uI-6−⊗	105mm	125mm	4.13in	4.92in	6.5L / 396ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 170-T6 − ⊗	Wd	T	⊗	170	⊗	2500	2001-2004
Century 170-T6 − ⊗	Ws	T	127	170	⊗	2500	2001-2004

NOTES: Westerbeke Webpage. SpecSheet. Operator’s Manual. Parts Callout Drawing. Service Manual. Wiring Diagram Rev A.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-6−⊗	⊗mm	⊗mm	4.13in	4.92in	⊗L / 396.00ci
Base Engine	Ws	uI-6−⊗	105mm	125mm	4.13in	4.92in	6.5L / 396.00ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Century 170-T6A − ⊗	Wd	T	⊗	173	⊗	2200	2005-20??
Century 170-T6A − ⊗	Ws	T	129	173	⊗	2200	2005-20??

NOTES: Westerbeke Webpage. SpecSheet. Installation Drawing. Operator’s Manual. Parts Callout Drawing. Wiring Diagram Rev A.
++++++++++++++++

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ds	uI-⊗−⊗	⊗mm	⊗mm	⊗in	⊗in	⊗L / ⊗ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
? − ⊗	Ds	T	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
? − ⊗	Ds	T	⊗	⊗	⊗	⊗	19??-19??

Table Under Development
If you can help us add brand information, Spec Sheets, Manuals, etc. that we lack, please submit the link or PDF to Editor♣EverythingAboutBoats.org (Replace “♣” with “@”) so we can add it to the website. Thanks!

Diesel Engine Duty Ratings

Westerbeke Duty Ratings

Con = Continuous, Constant

Int = Intermittent (One Hour Rating)

Max = Maximum

Usable

NMI = Normal Max Intermittant

SPRM = Special Peak Rating Max

CRPO =

URPO =

Pleasure Craft

RATING: W = Workboat (Usually 90% of P), (6270) C = Continuous, P = Pleasure (Intermittent)
^ COM = Commercial, R = Recreational, WB = Work Boat, PC = Pleasure Craft, M = Medium
^ CON = Continuous, INT = Intermittent, PLE = Pleasure
^ CA = Continuous “A”, CB = Continuous “B”, BS = HP, BS OL = BHP in Overload
^ CON, CD, HD, MCD, MD, INT, ID, GS, HO, etc. (See Duty Ratings at end of this table)

Specifications For Westerbeke
4-Stroke Cycle Gasoline Marine Engines
(by Ascending Horsepower)

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	U-1−⊗	⊗mm	⊗mm	2.76in	2.76in	⊗L / 16.41ci
Base Engine	Ws	U-1−⊗	⊗mm	⊗mm	1.75in	2.756in	⊗L / 16.3ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
Vire 7 − ⊗	Wd	N	⊗	7	⊗	3200	19??-19??
Vire 7 − Con	Ws	N	⊗	7	⊗	3200	19??-19??
Vire 7 − ⊗	Ws	N	⊗	7.3*	⊗	3700	19??-19??
Vire 7 − ⊗	Ws	N	⊗	7.1*	⊗	4000	19??-19??

NOTES: Westerbeke Webpage. SpecSheet (*see Power Curve for HP). Installation Drawing. Operator’s Manual. Parts List. Parts Manual. Service Manual. Technical Manual. Wiring Diagram. Wiring Diagram Rev A. Wiring Diagram Rev B. Wiring Diagram Rev C.

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	2.99in	2.87in	⊗L / 60.60ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 26G − ⊗	Wd	N	⊗	26	⊗	3000	1986-1999
W 26G − ⊗	Ds	N	⊗	26	⊗	3000	1986-1999

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-3−⊗	⊗mm	⊗mm	⊗in	⊗in	⊗L / ⊗ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 26GX − ⊗	Wd	N	⊗	26	⊗	3000	19??-19??
W 26GX − ⊗	Ds	N	⊗	26	⊗	3000	19??-19??

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	⊗in	⊗in	⊗L / ⊗ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 41G − ⊗	Wd	N	⊗	41	⊗	3600	1986-1993
W 41G − ⊗	Ds	N	⊗	41	⊗	3600	1986-1993

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−⊗	⊗mm	⊗mm	3.38in	3.70in	⊗L / 133.30ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	20??-

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 70GA − ⊗	Wd	N	⊗	66	⊗	3600	2003-
W 70GA − ⊗	Ds	N	⊗	66	⊗	3600	2003-

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−?	?mm	?mm	?in	?in	?L / ?ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 71G − ⊗	Wd	N	⊗	70	⊗	3600	19??-19??
W 71G − ⊗	Ds	N	⊗	70	⊗	3600	19??-19??

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ww	uI-4−?	?mm	?mm	?in	?in	?L / ?ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-20??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
W 70G − ⊗	Wd	N	⊗	70	⊗	3600	1988-2001
W 70G − ⊗	Ds	N	⊗	70	⊗	3600	1988-2001

BASE ENGINE	DS	CYL	BORE	STROKE	BORE	STROKE	DISPLACEMENT
Base Engine	Ds	uI-?−?	?mm	?mm	?in	?in	?L / ?ci

♣ MfrBRAND
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
? − ⊗	Ds	T	⊗	⊗	⊗	⊗	19??-19??

♣ WESTERBEKE
MODEL − RATING	DS	ASP	KW	BHP	MHP	@RPM	YEARS MFR'D
? − ⊗	Ds	N	⊗	⊗	⊗	⊗	19??-19??
? − ⊗	Ds	T	⊗	⊗	⊗	⊗	19??-19??

Literature & Manuals

Catalogs

Westerbeke Product Catalog (English).
Westerbeke Product Catalog (Portuguese).
Westerbeke Product Catalog (Spanish).

Brochures

Brochures.
^ From _____

SpecSheets, etc. By Model (in Ascending Horsepower) w/Links:
Models (w/Links to Westerbeke’s Document Library Webpages), HP (w/Links to Westerbeke’s Model Spec Webpages), SpecSheets,

ΞPIXΞ

s, Installation Drawings, Operator’s Manuals, Parts Lists, Service Manuals, and Wiring Diagrams.

Westerbeke Diesel Propulsion Engines

Model	HP	SpecSheet
ΞPIXΞ
s	InstallDwg	OpManual	Parts	Service	Wiring
DS 5	5	SpecSheet				Parts	Service.
7A One	6.4	SpecSheet			OpManual	Parts		1‚A‚B‚C
W 7	7	SpecSheet				Parts	Service
DS 7	7	SpecSheet				Parts	Service
10 Two	10	SpecSheet			OpManual	Parts	Service
W 10	10	SpecSheet
11A One	10.7	SpecSheet		InstallDwg	OpManual			A‚B‚C
12B Two	12	SpecSheet		InstallDwg	OpManual		Service	K‚L‚M‚N
12C Two	12	SpecSheet		InstallDwg	OpManual	Parts	Service	K‚L‚M‚N
12D Two	12	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service	N
W 13	13.5	SpecSheet			OpManual	Parts	Service
W 13A	13.5	SpecSheet			OpManual	Parts	Service
Pilot 50	15	SpecSheet
4-60	15	SpecSheet				Parts	Service
20B Two	18	SpecSheet
ΞPIXΞ
		OpManual	Parts	Service
W 18	18	SpecSheet			OpManual	Parts	Service
W 20	20	SpecSheet
W 21	22?	SpecSheet			OpManual	Parts	Service
W 21A	22	SpecSheet			OpManual	Parts	Service
L-25	22	SpecSheet				Parts	Service
RD-60	22	SpecSheet				Parts	Service
W 30	25	SpecSheet				Parts	Service
30C Three	25	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service	N
W 27	27	SpecSheet			OpManual	Parts	Service
30B Three	27	SpecSheet		InstallDwg	OpManual	Parts	Service
35E Three	28	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service	N
35C Three	29	SpecSheet		InstallDwg	OpManual	Parts	Service
W 27A	30	SpecSheet			OpManual	Parts	Service
RD-80	30	SpecSheet		InstallDwg			Service
W 33A	31	SpecSheet			OpManual	Parts	Service
35D Three	31	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
35B Three	32	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
W 33	33	SpecSheet			OpManual	Parts	Service.
4-99	34	SpecSheet				Parts	Service
38B Four	37	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
W 40A	37	SpecSheet
W 40	37	SpecSheet				Parts	Service
44C Four	38	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service	N
44A Four	40	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
4-107	40	SpecSheet				Parts	Service
W 50	41	SpecSheet				Parts	Service
42B Four	42	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
44B Four	44	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
W 46	46	SpecSheet			OpManual	Parts	Service	B1‚B2
55D Four	48	SpecSheet
ΞPIXΞ
		OpManual	Parts	Service
W 52	52	SpecSheet			OpManual	Parts	Service
W 60	53	SpecSheet				Parts	Service
55A Four	55	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
55C Four	55	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
55B Four	55	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
W 58	58	SpecSheet			OpManual	Parts	Service
63D Four	61	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
63B Four	63	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
63C Four	63	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
64A Four	64	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
65B Four	66	SpecSheet		InstallDwg	OpManual	Parts	Service	M
65A Four	68	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
W 70	70	SpecSheet			OpManual	Parts	Service
71B Four	71	SpecSheet			OpManual	Parts	Service	J‚K‚L‚M‚N
71C Four	71	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
W 80	75	SpecSheet				Parts	Service
82B Four	82	SpecSheet		InstallDwg	OpManual	Parts	Service	J‚K‚L‚M‚N
90A Four	90	SpecSheet		InstallDwg		Parts	Service	J‚K‚L‚M‚N
W 100	100	SpecSheet			OpManual	Parts	Service
108B Six	108	SpecSheet			OpManual	Parts		J‚K‚L‚M‚N
108C Six	108	SpecSheet			OpManual	Parts		J‚K‚L‚M‚N
W 120	115	SpecSheet				Parts

CENTURY
80-N4	80	SpecSheet			OpManual	Parts	Service	A
110-T4	110	SpecSheet			OpManual	Parts	Service	A
120-N6	120	SpecSheet			OpManual	Parts	Service	A
120-T4A	126	SpecSheet		InstallDwg	OpManual	Parts		A
170-T6	170	SpecSheet			OpManual	Parts	Service	A
170-T6A	173	SpecSheet		InstallDwg	OpManual	Parts		A

Westerbeke Gasoline Propulsion Engines

Model	HP	SpecSheet
ΞPIXΞ
s	InstallDwg	OpManual	Parts	Service	Wiring
Vire 7	7	SpecSheet		InstallDwg	OpManual	Parts	Service
W 26G	26	SpecSheet		InstallDwg	OpManual	Parts	Service
W 26GX	26	SpecSheet		InstallDwg	OpManual	Parts	Service
W 41G	41	SpecSheet		InstallDwg	OpManual	Parts	Service
W-70GA	66	SpecSheet		InstallDwg	OpManual	Parts	Service
W 71G	70	SpecSheet		InstallDwg	OpManual	Parts	Service
W 70G	70	SpecSheet		InstallDwg	OpManual	Parts	Service

Westerbeke Diesel Generators

Model	HP	SpecSheet
ΞPIXΞ
s	InstallDwg	OpManual	Parts	Service	Wiring
M	H	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service

Westerbeke Gasoline Generators

Model	HP	SpecSheet
ΞPIXΞ
s	InstallDwg	OpManual	Parts	Service	Wiring
M	H	SpecSheet
ΞPIXΞ
	InstallDwg	OpManual	Parts	Service

Forum Posts

Tech Tips

Tech Notes

Related AEABoats Webpages

Related Books

*Book is currently part of our members’ Academy eLibrary. To view the entire book, click on the book’s Title above to go to the book’s AEABoats webpage and then Click the “Library” link.

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Related Websites

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just mention Title & Author in email to: Editor♣EverythingAboutBoats.org

Contact Information

Westerbeke Corporation
150 John Hancock Road
Myles Standish Industrial Park
Taunton, MA 02780
Telephone: (508) 823-7677
Fax Line: (508) 884-9688
Toll Free: 1-8
Website: www.westerbeke.com/index.htm
Contact Form: www.westerbeke.com/pages/contact.htm
Email: internet#westerbeke.com

Please contact the Master Distributor in your area for all inquiries including sales, parts, service, warranty, and technical support.

EVERYTHING ON THIS PAGE OK?
If there is anything on this webpage that needs fixing, please let us know via email To:
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Visit our FEATURED ARTICLES Home Page
to see examples of our website's comprehensive contents!

Thanks to our amazing contributors for the steady flow of articles, and to our dedicated all-volunteer staff who sort, polish and format them, everyday we get a little bit closer to our goal of
Everything About Boats. If you would like to submit an article,
See Submitting Articles.

— TOP 20 MOST POPULAR ARTICLES —

Detroit Diesel 8.2 Liter “Fuel Pincher” V8 Engine
Cummins V-555 & VT-555 “Triple-Nickel” V8 Diesel Engine
Lehman 120 (6D380) Diesel Engine (Ford 2704C & 2715E)
Ford Industrial Power Products Diesel Engines
How to Identify Ford Diesel Engines
Ford 2715E Diesel Engine
Lehman Mfg. Co.
Perkins Engines
Universal Atomic 4
Sears Boat Motors: Motorgo, Waterwitch, Elgin, etc.
Chrysler & Force Outboards
Eska Outboard Motors
Allison Transmission
ZF Friedrichshafen AG
Marine Surveyors by Country
American Marine Ltd (Grand Banks)
Boat Inspection (Types of Marine Surveys)
Boat Builders: (A∼Z) (w/Vessel Types, Locale & Years Active)
USCG NVIC 07-95 Guidance on Inspection, Repair and Maintenance of Wooden Hulls
American Boat and Yacht Counsel (ABYC)

Layout of the EverythingAboutBoats.org Website's Pages

— Types of Webpages —
This website consists almost entirely of 3 types of webpages as follows:

TOPIC PAGES (See Main Topic Pages listed on Website Contents or the Right Sidebar) ⇒
- EXAMPLE: – WEBSITE CONTENTS w/Links to MAIN TOPIC & Subtopic Pages:
- EXAMPLE: 02 – BOAT BUILDING, OUTFITTING, REFITTING & REPAIR:
- EXAMPLE: 02.06 – Boat Equipment:
- EXAMPLE: 02.06.08 – Propulsion Machinery:
- EXAMPLE: 02.06.08.01 – Engines w/Directory of Vendors.
VENDOR PAGES (Vendors of Products, Services, Events,+, Destinations & Media Creators)
- EXAMPLE: 02.06.08.01 – ^ Ford Industrial Power Products Diesel Engines.
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- EXAMPLE: 02.06.08.01 – ^ ^ Ford 2715E Diesel Engine.
- EXAMPLE: 02.06.08.01 – ^ ^ Ford OpManual - 2710 Range Diesel Engines.
- EXAMPLE: 02.06.08.01 – ^ ^ Ford Service Manual - 2700 & 2710 Range Diesel Engines.

Clickable Links that lead to other webpages appear in Blue Text and usually open in a new window.
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Vendors' Product Documentation (pDoc) are considered Media.
Destinations & Media Creators are treated as Vendors.
All Website Pages are optimized for viewing on
full-width disktop computer monitors,
but can be viewed on phones.

— Contents of Webpages —
Website Pages typically contain the following Sections:

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1. EXAMPLE:
  PATH: HOME, WEBSITE INDEX, WEBSITE CONTENTS » ∨
  ∧ BOAT BUILDING & REPAIR » Boat Equipment » Propulsion » Engines » ∨∨
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  Lees, Lehman, Mermaid, Parsons, Renault, Sabre, Thornycroft, Wortham Blake »
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2. (The "»" right pointing Guillemet symbol shows the chain through the page links.)
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  - (Manufacturers, Resellers, Refitters, Yards, Surveyors, Clubs, Schools, Authors,+).
  - (Boating & Travel Destinations are treated as Vendors on their own Vendor Pages).
3. PRODUCT PAGES (Product Features, Vendor Links, Specifications, Documentation,+).
  - (Media created by a vendor is often treated as a Product on its own Product Page).
  - (Boating & Travel Events are often treated as Products on their own Product Pages).
RELATED RESOURCES (Topics, Vendors, Products, Media: Books, Websites,+ with Links).
PAGE TAIL Contains the following Anchors Aweigh Academy & EAB Website Features:
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5. Topics of Webpages. (The very next section below ⇓).
6. What we have accomplished so far.
7. Members must Sign-In to gain full access to Expanded Pages & Programs.
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The MAIN TOPICS follow a natural progression from conception of the vessel thru its
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00 – HOME: CONTENTS, ABOUT EAB: Contact EAB, Abbreviations & Symbols, FAQ, GLOSSARY, ADs,+.
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The above MAIN TOPICS and a more detailed listing of Subtopics can
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What we have accomplished so far.
Anchors Aweigh Academy and its EverythingAboutBoats.org website.

Published over 50,000 website pages about boats and boating, bringing us closer to reaching our goal of becoming "The ultimate reference resource about boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner!"
Published over 300 website main topic webpages, many with full articles on the topic. See our Website Contents or the Right Sidebar for the listing of the main topic pages.
Published over 9,000 marine vendor webpages, all with their contact information, most with a description of their products and services, many with product documentation, specifications and independent reviews. (incl.: Boat designers, boat building tools, material and equipment manufacturers and suppliers, boat builders and dealers, yacht brokers, marine surveyors, boat insurers, boat transporters, skippers and crews, boatyards and marinas, yacht clubs, boat rentals and yacht charters, boating, seamanship and maritime schools, marine law attorneys and expert witnesses, boat refitters and repairers, book authors, magazine publishers, video producers, and website creators)
Acquired over 120,000 pages of product documentation including Catalogs, Brochures, SpecSheets, Pictures, Serial Number Guides, Installation Manuals, OpManuals, Parts Catalogs, Parts Bulletins, Shop Manuals, Wiring Diagrams, Service Bulletins, and Recalls. And have made all viewable to Academy Members through our EAB website eLibrary.
Acquired over 1,200 books and magazine back issues in our academy library and so far have made over 700 viewable to Academy Members through our EAB website eLibrary.
Published over 500 DIY How-To articles about boat design, construction, inspection, operation, maintenance, troubleshooting and repair. We are working hard to do more.

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FROM Donald: "This is an awesome website. I found the information that I needed right away from one of the over 20,000 free articles that you provide as a public service. I'm surprised that so much if this site is free. But I still signed up so I could access the thousands of expanded pages, interesting articles, and dozens of valuable programs! The member's library of books, magazines and videos that I can view online is really terrific! I understand that you and your staff are all unpaid volunteers. Please keep up the good work. And I commend you for your plans to add another 10,000 free informative articles over the next year. I'm thrilled to support you in this endeavor with my small membership donation. Thanks again for all your hard work."

FROM Huey: "I agree with my Uncle, I too have found the articles to be very enlightening. They say that it will take about 100,000 articles to cover the full scope that they have envisioned for the website. They have over 20,000 articles so far and that's doing pretty well, but it could take several years to get the rest. I also noticed that many of the Main Topic Pages and some of the article pages are still in the rough draft stage. I guess that they will fill in as they can get volunteers to work on them. But what I can't figure out is why anyone would spend the time writing informative in depth articles just to give away free to this website for publication? What's in it for them?"

FROM Dewey: "Well Huey, to me It looks like most of the articles on this website are written by very informed people, like boating instructors, boat designers, boat builders, riggers, electricians, fitters, marine repair technicians and marine surveyors. Writing such articles helps establish them as knowledgeable professionals. After all, this website was originally created by a school for marine technicians and marine surveyors. The website is growing in content every day. They even had to move to a bigger, more powerful server because the website's traffic has been growing exponentially."

FROM Louie: "I agree with everyone above. This site is quickly becoming the ultimate reference resource about every aspect of boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner. I use the topic pages on the right sidebar to browse around the website. It's like a Junior Woodchucks' Guidebook for Boaters. Their Members' Library of over 300 popular and obscure books and over 200 magazine back issues that can be viewed online is fabulous. The Academy's magazine is especially informative. On top of that, there is the "Ask-An-Expert program for members where you can get an expert's answer to any of your boat questions. And a whole years membership is only $25. What a deal! I really love being part of this "Everything About Boats" community and help provide thousands of helpful articles free to the public. I think that I'll sit down right now and write an article about my experiences boating with my uncle."

FROM Scrooge: "You rave about this website like it was the best thing since sliced bread. Well, I think it stinks. Sure, it has a lot of good information for boaters, and they're adding more every day, but it will probably never be finished. Furthermore, I don't even own a boat. And I wouldn't have a boat even if someone gave me one. Boats are a waste of money and time and energy and money! They're just a hole in the water you pour money into. If you gave me a boat, I'd sell it quicker then you could say Baggywrinkle. Then I'd lock up the cash with all my other money so I could keep my eye on it and count it every day. Bah humbug."

FROM Daisy: "I'm just so glad that Donald got the boat so we and the boys could enjoy boating — together. And of course all of the girls, April, May, and June, love to be on the water too, especially when that is where the boys are. Oh poor Scrooge, boating is more fun then you could possibly imagine."

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everythingaboutboats.org

Everything About Boats – The Ultimate Reference Resource for Boaters

Westerbeke L-25

History

Specifications For Westerbeke
4-Stroke Cycle Diesel Marine Engines
(by Ascending Horsepower)

Diesel Engine Duty Ratings

Westerbeke Duty Ratings

Specifications For Westerbeke
4-Stroke Cycle Gasoline Marine Engines
(by Ascending Horsepower)

Literature & Manuals

Forum Posts

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Tech Notes

Related AEABoats Webpages

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If you would like us to add a particular book, magazine, video, website, etc. to this page,
just mention Title & Author in email to: Editor♣EverythingAboutBoats.org

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History

Specifications For Westerbeke 4-Stroke Cycle Diesel Marine Engines (by Ascending Horsepower)

Diesel Engine Duty Ratings

Westerbeke Duty Ratings

Specifications For Westerbeke 4-Stroke Cycle Gasoline Marine Engines (by Ascending Horsepower)

Literature & Manuals

Forum Posts

Tech Tips

Tech Notes

Related AEABoats Webpages

Related Main Topic Page Links

Related Articles

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Related Magazines

Related Videos

Related Websites

If you would like us to add a particular book, magazine, video, website, etc. to this page, just mention Title & Author in email to: Editor♣EverythingAboutBoats.org

Contact Information

Specifications For Westerbeke
4-Stroke Cycle Diesel Marine Engines
(by Ascending Horsepower)

Specifications For Westerbeke
4-Stroke Cycle Gasoline Marine Engines
(by Ascending Horsepower)

If you would like us to add a particular book, magazine, video, website, etc. to this page,
just mention Title & Author in email to: Editor♣EverythingAboutBoats.org