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Pinion Bearing Question and Shimming

Old 05-03-2021, 08:46 PM
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Default Pinion Bearing Question and Shimming

So I have a 0F730808 Bravo 1 and I'm rebuilding with the newer/thicker floor gear set and supporting hardware to do this. With doing this upgrade I need this pinion bearing (31-8M0103472) that requires it to be shimmed. According to Service Manual 28 Supplement it says for drives 0W100000 and up to start with a 0.035 shim to start with to achieve a 0.025 clearance/backlash. With my older drive, would a 0.035 shim still be a good starting point??



With a older drive, would it be better to use the pinion bearing (31-8M0104358) that don't require shimming?
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Old 05-03-2021, 10:49 PM
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Do you have the pinion shimming tool?

If you donít, youíre probably better off using the older style bearing that
doesnít need shimmed


Once I got into my 1st upper with the new style shimmed bearing I bought the shimming
tool and after that I never used the old style bearings again.

.035 seems about right, but without the tool to verify, itís just a guess

Last edited by JaayTeee; 05-03-2021 at 11:02 PM.
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Old 05-04-2021, 05:53 AM
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Originally Posted by JaayTeee View Post
Do you have the pinion shimming tool?

If you donít, youíre probably better off using the older style bearing that
doesnít need shimmed


Once I got into my 1st upper with the new style shimmed bearing I bought the shimming
tool and after that I never used the old style bearings again.

.035 seems about right, but without the tool to verify, itís just a guess
I have the shimming tool, I set my last drive up with it two years ago and it worked out great. But it was a 0M100000 + serial so it already had the correct shim. I'll pick up a couple different shims and hopefully I'll get the right one the first go around haha! Thanks!!
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Old 05-05-2021, 09:41 AM
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Hey Jim, if you don't want to use the shim,,just use the old style race that doesn't need a shim ,,the bearings are the same,,just a different race as used in the older Bravo's, the Timken race part number for the old style is 28621.,,if you install the new style race that needs a shim it must be measured with the shimming tool,, no telling where the pinion gear depth will be until you measure it.
You also must then check the driven gear backlash on both gears with a stub shaft , dial indicator, clamping tool, and the correct flag on the stub shaft for the gear ratio.,, the Merc. manual gives you a cross reference for the driven gear shims compared to shims on the older housing, but that is not exact either,, you must check the backlash.to be sure it's in spec.
Hope this helps.
Mike

Last edited by 253; 05-05-2021 at 11:03 AM.
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