Engine-to-Marine Gear Interfaces

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WEBPAGE CONTENTS:
Introduction
^  Flywheels
^  ^  Flywheel & Housing SAE Specs
^  Damper Plates
^  Flywheel & Transmission Adapter Housings
^  Drive Shafts (Jackshafts)
NOTES: Page under Development

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Flywheels

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Flywheel & Housing SAE Specs (SAE J620 and J621 Details)

The information on these data sheets provide general details and are meant to be a guide only, Always request specific installation drawings from your supplier with as built dimensions.
SAE-Drawing_Details

Dimensions for identification purposes only.
SAE Engine Housing Dimensions
SAE ‘ A ” ‘ B ” ‘ G ”
SIZE Dia. Dia. Qty. Size
OO 33.500 31.000 16 1/2” – 13
O 26.750 25.500 16 1/2 ” – 13
1/2 24.375 23.000 12 1/2” – 13
1 20.875 20.125 12 7/16” – 14
2 18.375 17.625 12 3/8” – 16
3 16.875 16.125 12 3/8” – 16
4 15.000 14.250 12 3/8” – 16
5 13.125 12.375 8 3/8” – 16
6 11.250 10.500 8 3/8” – 16
Dimensions E and F may vary, measure to verify if unknown.
SAE Engine Flywheel Dimensions
SAE ‘C’ ‘D’ ‘E’ ‘F’ ‘H’
SIZE Dia. Dia. Dia. Qty Size
6 – 1/2 8.500 7.875 1.19 2.05 6 5/16″ – 18
7 – 1/2 9.500 8.750 1.19 2.05 8 5/16″ – 18
8 10.375 9.625 2.44 2.44 6 3/8″ – 16
10 12.375 11.625 2.12 2.83 8 3/8″ – 16
11 – 1/2 13.875 13.125 1.56 2.83 8 3/8″ – 16
14 18.375 17.250 1.00 3.14 8 1/2” – 13
18 22.500 21.250 0.62 3.93 6 5/8″ – 11
21 26.500 25.250 0.00 5.11 12 5/8″ – 11
24 28.875 27.250 0.00 5.11 12 3/4″ – 10
Typical Industrial Power Take Off Dimensions
Clutch Size ‘J’ ‘K’ ‘L’ ‘M’ ‘S’
Ball, Main Bearing 6 1/2″ & 7 1/2″ 1.68″ 1.19″ 5.56″ 3.5″ 1.438″
Taper Roller Main Bearings 6 1/2″ & 7 1/2″ 1.68″ 1.19″ 7.06″ 3.5″ 1.438″
Taper Roller Main Bearings 8″ 1.44″ 2.24″ 7.06″ 6.0″ 1.750″
Taper Roller Main Bearings 10″ 1.75″ 2.12″ 8.63″ 5.5″ 2.250″
Taper Roller Main Bearings C111TD 1.75″ 2.12″ 8.63″ 5.5″ 2.250″
Taper Roller Main Bearings 1P – 11 1/2″ 2.26″ 1.56″ 9.25″ 6.5″ 2.250″
Taper Roller Main Bearings 2P – 11 1/2″ 2.31″ 1.56″ 9.63″ 6.5″ 2.500″
Taper Roller Main Bearings 1P – 14″ 2.82″ 1.0″ 12.13″ 8.5″ 3.000″
Taper Roller Main Bearings 2P – 14″ 2.82″ 1.0″ 13.75″ 10.0″ 3.500″
Taper Roller Main Bearings 3P – 14″ 2.82″ 1.0″ 14.50″ 10.0″ 3.938″

Dimensions for identification purposes only.
SAE Engine Housing Dimensions
SAE ‘ A ” ‘ B ” ‘ G ”
SIZE Dia. Dia. Qty. Size
OO 33.500 31.000 16 1/2” – 13
O 26.750 25.500 16 1/2 ” – 13
1/2 24.375 23.000 12 1/2” – 13
1 20.875 20.125 12 7/16” – 14
2 18.375 17.625 12 3/8” – 16
3 16.875 16.125 12 3/8” – 16
4 15.000 14.250 12 3/8” – 16
5 13.125 12.375 8 3/8” – 16
6 11.250 10.500 8 3/8” – 16
Dimensions E and F may vary, measure to verify if unknown.
SAE Engine Flywheel Dimensions
SAE ‘C’ ‘D’ ‘E’ ‘F’ ‘H’
SIZE Dia. Dia. Dia. Qty Size
6 – 1/2 8.500 7.875 1.19 2.05 6 5/16″ – 18
7 – 1/2 9.500 8.750 1.19 2.05 8 5/16″ – 18
8 10.375 9.625 2.44 2.44 6 3/8″ – 16
10 12.375 11.625 2.12 2.83 8 3/8″ – 16
11 – 1/2 13.875 13.125 1.56 2.83 8 3/8″ – 16
14 18.375 17.250 1.00 3.14 8 1/2” – 13
18 22.500 21.250 0.62 3.93 6 5/8″ – 11
21 26.500 25.250 0.00 5.11 12 5/8″ – 11
24 28.875 27.250 0.00 5.11 12 3/4″ – 10
Typical Industrial Power Take Off Dimensions
Clutch Size ‘J’ ‘K’ ‘L’ ‘M’ ‘S’
Ball, Main Bearing 6 1/2″ & 7 1/2″ 1.68″ 1.19″ 5.56″ 3.5″ 1.438″
Taper Roller Main Bearings 6 1/2″ & 7 1/2″ 1.68″ 1.19″ 7.06″ 3.5″ 1.438″
Taper Roller Main Bearings 8″ 1.44″ 2.24″ 7.06″ 6.0″ 1.750″
Taper Roller Main Bearings 10″ 1.75″ 2.12″ 8.63″ 5.5″ 2.250″
Taper Roller Main Bearings C111TD 1.75″ 2.12″ 8.63″ 5.5″ 2.250″
Taper Roller Main Bearings 1P – 11 1/2″ 2.26″ 1.56″ 9.25″ 6.5″ 2.250″
Taper Roller Main Bearings 2P – 11 1/2″ 2.31″ 1.56″ 9.63″ 6.5″ 2.500″
Taper Roller Main Bearings 1P – 14″ 2.82″ 1.0″ 12.13″ 8.5″ 3.000″
Taper Roller Main Bearings 2P – 14″ 2.82″ 1.0″ 13.75″ 10.0″ 3.500″
Taper Roller Main Bearings 3P – 14″ 2.82″ 1.0″ 14.50″ 10.0″ 3.938″
More from Capitol Marine Gears
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Damper Plates

Damper Plate
Adapter Plates must 1) match up and bolt onto the flywheel. 2) absorb the torsional impulses created by the engine during each power stroke so they don’t cause gear chatter in the marine gear, and 3) match the spline of the input shaft of the marine gear. Note that the damper function is incorporated into the new dual-mass flywheel technology where the dampening is much more effective however the flywheel bushings are vulnerable to early failure due at least in part to exposure to the marine environment.
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Damper plates lead a tough life – FoleyEngines.com Tech Tip #104
They work in the dark, are often soaked in salt water, and are never checked, let alone maintained. They are the marine equivalent of a mushroom! The damper plate is bolted to the flywheel with a half dozen or so small metric allen bolts. Into this clutch like plate slides the splined input shaft of the Hurth or Borgwarner gear. The damper plate acts as coupler between the engine and the transmission and all torque is transmitted through it.
Noisy damper plate
Sometimes these hard working clutches rebel and their springs loosen up and even fall out. Or one or more of the allen bolts back out and the plate become loose and moves around. Symptoms of this will be a rattling sound from the bellhousing area when in neutral. Engaging gear is often difficult and the Hurth gear is hard to shift. Often loose or missing springs is the only problem. People often think that they need a new transmission when all they need is to replace the damper plate.
What to look for
If you suspect that your damper plate springs are loose and rattling around and that you have damper plate problems here is what to look for. First check your linkage to ensure that everything is tight and working properly. Then check that the bolts holding the damper plate in place are present and installed correctly. Verify that the Hurth or Borgwarner gear is not mis-aligned. Use a dial indicator to check for this. Finally, if the damper plate is worn and/or springs are missing, check to see that your Hurth orBorgwarner gear’s front bearing hasn’t failed. Worn damper plates can often cause the transmissions’ input shaft to wear and result in front bearing failure.

More

This Tech Tip, one in ongoing series we publish for Hurth and Borgwarner Velvet Drive marine transmission owners, is aimed at helping people understand their marine damper plates. This Tech Tip follows other Tech Tips that discuss Hurth marine transmissions: Tech Tip #22, Hurth Gears: Care and Maintenance, Tech Tip #78: Hurth Marine Transmissions: The Ins and Outs of Basic Service, and Tech Tip #96, ZF/Hurth Marine Transmissions: A Six Step Program. We also discuss Hurth and Borg warner marine gears in our Tech Tip #2, Marine Transmission Fluid, Tech Tip #47, Avoiding Idling Gears, An Interview in National Fisherman, Tech Tip #51, Souping Up the Series 72 Borg Warner Gear, Tech Tip #59, ZF/Hurth Marine Coupler or Damper Plate 101, Tech Tip #101, Hurth Gear Shift Position: A Warning, and Tech Tip #105, Hurth and ZF/Hurth Marine Transmissions: Old Wine in New Bottles?

More from FoleyEngines.com

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Damper Plate Manufacturers
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ALTO
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Damper Plate Suppliers
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ASAP Supplies
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Marine Engine Parts
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Pacific Marine & Industrial – Damper Selection Chart
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R and D Marine
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Flywheel & Transmission Adapter Housings

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Drive Shafts (Jackshafts)

Jackshaft

More from MarinePartsPlus.com
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