British Leyland 4-91

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^  History
^  Engine Specifications (Diesel Propulsion)
^  ^  Diesel Engine Duty Ratings
^  Engine Specifications (Gasoline Propulsion)
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NOTE: Page Under Development

Intro

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History

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General

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Specifications For British Leyland
4-Stroke Cycle Diesel Marine Engines
(by Ascending Displacement)

TABLE KEY: (Table still under development)
⊗ = Data Not Available from Data Source, ? = …? = ¿…? = Data Not Confirmed.
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.
CYL = Cylinder Configuration “-” Number “−” Liner Type:
^  Cylinder Configuration: U = u… = Upright (Vertical), I = In-Line,
^  Liner: W = Wet Liner(s), D = Dry Liner(s), WD = Combo Wet+Dry Liners,
^  ^  P = Parent/Native Bore, C = Cylinder(s) (Independent), b… = Borable Oversize,
^  ^  S = Sleeved (Press fit?), Liner type determined from Service Manual and/or Parts List.
BORE & STROKE: …mm = Millimeters, …” = …in = Inches.
DISPLACEMENT: …cc = Cubic Centimeters (cm³), …L = Liters (Litres), …ci = Cubic Inches (“³).
⇑ = 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.
^  -Fueling: M = Mechanical Injection, iI = 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.

1489cc / 90.88ci

BASE ENGINE DS CYL BORE STROKE BORE STROKE DISPLACEMENT
British Leyland 4-91 Ww uI-4−D ⊗mm ⊗mm 2.80in 3.5in ⊗L / 91.00ci
British Leyland 4-91 Ws uI-4−D ⊗mm ⊗mm 2 7/8in 3½in ⊗L / 91ci
British Leyland 4-91 Wm uI-4−D 73.05mm 88.9mm 2.8760in 3.50in 1489cc / 90.88ci
⇑ BRITISH LEYLAND
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
4-91 − ⊗ Ds N-M ⊗ ⊗ ⊗ ⊗ 19??-19??
⇑? PERKINS?
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
4-91? − ⊗ Ds N-M ⊗ ⊗ ⊗ ⊗ 19??-19??
⇒ WESTERBEKE
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
4-91 − ⊗ Ds N-M ⊗ ⊗ ⊗ ⊗ 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.

1489cc / 90.88ci

BASE ENGINE DS CYL BORE STROKE BORE STROKE DISPLACEMENT
British Leyland 4-91 Ww uI-4−D ⊗mm ⊗mm 2.80in 3.5in ⊗L / 91.00ci
British Leyland 4-91 Ws uI-4−D ⊗mm ⊗mm 2 7/8in 3½in ⊗L / 91ci
British Leyland 4-91 Wm uI-4−D 73.05mm 88.9mm 2.8760in 3.50in 1489cc / 90.88ci
⇑ BRITISH LEYLAND
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
4-91 − ⊗ Ds N-M ⊗ ⊗ ⊗ ⊗ 19??-19??
⇑? PERKINS?
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
4-91? − ⊗ Ds N-M ⊗ ⊗ ⊗ ⊗ 19??-19??
⇒ WESTERBEKE
MODEL − RATING DS ASP kW BHP MHP @RPM YEARS MFR'd
W 30 − ⊗ Wd N-M ⊗ 25 ⊗ 2500 1975-1981
W 30 − ⊗ Ws N-M ⊗ 25 ⊗ 2500 1975-1981

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

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.

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!

More from Wikipedia

More from BoatDiesel.com

More from _____

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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 = 

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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)

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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!

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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,

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

Westerbeke Diesel Propulsion Engines

Model HP SpecSheet

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s InstallDwg OpManual Parts Service Wiring
W 30 25 SpecSheet Parts Service

More from Westerbeke

Charts and Graphs

Charts and Graphs.
^  From _____

Pictures

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Press Releases (Date = YYMMDD)

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Model History

Westerbeke Propulsion Model History (12/8/05).

Serial Number Guide – Manufacture Date Code Identification

Serial Number Guide – Manufacture Date Code Identification (5/12).

Installation Manuals/Instructions

Westerbeke Installation Manual (6/16).

Engine Replacement Guide 11-11.

Installation Diagrams & Drawings with Dimensions

Installation Diagrams & Drawings with Dimensions.
^  From _____

Owner/Operator’s Manuals

Owner/Operator Manuals.
^  From _____

Parts Lists/Manual/Schematics with Exploded Views & Parts Lists

Parts List #13945 (8th Ed) for W30 (10/80).

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Parts Bulletins

Parts Bulletins.
^  From _____

Repair/Service/Workshop/Technical Manuals

Technical Manual #11874 (5th ed) for W30 (9/80).

Service/Repair/Workshop/Technical Manuals.
^  From _____

Wiring Diagrams

Wiring Diagrams
^  From _____

Service Bulletins

Service Bulletins.
^  From _____

More from Westerbeke Propulsion Engine Document Library.

Product Recalls

Forum Posts

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Tech Tips

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Tech Notes

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Related AEABoats Webpages

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Related Main Topic Page Links

From Current CONTENTS Page

Related Articles

Westerbeke by Bill Parlatore from PassageMaker ©2005

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