Posted by Mike Dau on October 28, 2011 at 16:17:04 from (173.25.38.117):
I'm in the process of tearing down the engine on my '37 F-20, and at this point it's just the block and crank that's left. (and a couple of valve tappets that there doesn't seem to be any way to get out of the block, but that's another matter.) I've got a service manual that specifies tolerances for the connecting rod bearings, but it doesn't give any info for allowed play in the main bearings. There's no longitudinal (front-to-rear) play in the crankshaft, and the rear bearing has no lateral play in it, but the front bearing does have some. My question is: How much is too much? I want to rebuild the engine properly, but at the same time, I don't want to go through a lot of extra work and expense replacing a front main bearing that's ok as-is.
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