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Old 05-22-2015, 02:42 PM   #9
ursus
Senior Member
 
Join Date: May 2010
Location: Oregon
Posts: 1,369
Default Re: shimming engine bearings

The fact that your center main was out 0.003 tells me that there is enough wear that you should also measure the bearing races for ovality (out of roundness). The references to what is or isn't in spec for clearance are based a true round bearing and cannot be uniformly applied to a bearing surface that is no longer round.

The center main usually wears faster than the other two and I have learned to adjust it last. With sufficient wear, you may not be able to get the center main as tight as the others without creating a situation where the alignment is off a bit and your efforts result in accelerated wear and maybe a new knock.
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