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04-10-2020, 08:27 PM | #1 |
Senior Member
Join Date: May 2010
Location: Santa Rosa, CA
Posts: 1,276
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Flywheel housing shims
After some trial and error, I got the flywheel housing within .002 all the way around. However, it took shims of .022 on one ear and .018 on the other, which is way more than the gasket on the block which was .011. Question is, how many shims are too many shims. Seems to me, and this is the question, that at some point the housing is going to be tilted relative the the crankshaft center line and hence the pilot bearing. The top of the housing at the shims is going to be farther away from the block than is the area around the gasket. Any experience, thoughts, suggestions? Thanks
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04-10-2020, 09:34 PM | #2 |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,472
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Re: Flywheel housing shims
When you put your dial gauge on the end of the crank shaft and measure the edge of the flywheel housing, you are checking that it is perpendicular to the crank shaft. With 0.002" is a good reading so your housing is pretty well square to the crank - well within limits. Well done.
I think what you have found is the most common situation with flywheel housings. I bet that at some stage, that flywheel housing was on an engine when someone lifted the front of the motor to do some job without loosening the rear engine mount bolts. That distorts the housing and may even crack it. Did you check for cracks? When a housing is distorted that way, the ears at the top are bent back and the bottom is pulled forward so you'd need more shims under them the top to bring the housing back to square. Loosening those bolts is VERY commonly overlooked.
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I'm part of the only ever generation with an analogue childhood and a digital adulthood. Last edited by Synchro909; 04-10-2020 at 10:55 PM. |
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04-10-2020, 09:49 PM | #3 | |
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Join Date: Jul 2016
Location: Orangeville Illinois
Posts: 461
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Re: Flywheel housing shims
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04-11-2020, 03:09 AM | #4 |
Senior Member
Join Date: Jul 2014
Location: Fairbanks, Alaska
Posts: 126
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Re: Flywheel housing shims
I'd take it to a machine shop and have the front face surfaced so that it's parallel to the back face. Shouldn't cost much, then put the shim stock back on the shelf.
But, that's just my approach to the problem. |
04-11-2020, 08:35 AM | #5 |
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Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
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Re: Flywheel housing shims
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Take a look at this recent thread. Herm explains things very well. |
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