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bearings ( main)

T

trevor patnoad

Member
would an "under size" bearing be thicker or thinner than standard? My thought is that when you turn down a crank the bearing would have to get thicker to make up the space. any thoughts. thanks trevor.
 
thank's so I'm right in assuming that standard should fit. but not bind. unless the crank is out of round or needs to be polished. thanks for your post.
 
Bearings that fit a crankshaft journal that has been "turned" or ground smaller are called "undersized" because they fit a smaller than standard bearing journal.
 
If you are doing mains now, remember to look on the bearing backing to see if an undersize bearing is in their now. Don't assume on critical components.
 
(quoted from post at 04:42:56 08/19/10) If you are doing mains now, remember to look on the bearing backing to see if an undersize bearing is in their now. Don't assume on critical components.
Click to expand...

I junked a beautifal (potentially) buick besause I didn't have time to fix it right before being transferred.

Guy rebuilt my enging and used standard parts. Would idle find and speed up gradually, but at a certain RMP rattled like crazy. 20 years later and I'd still kick the sh!t out of him if I saw him.

Dave
 
Gene, you are certainly entitled to your opinion,

Unfortunately you are not in agreement with the bearing industry.

Bearings for a reground (smaller) crankshaft are ALWAYS sold as UNDERsize bearings.
 
Yes they are listed that way meaning the crank has been ground but the bearings themselves are thicker just mik them out. I sometimes using a ball mike measure the inserts to see how mush they are worn.
 
I'm assuming that you snugged the caps from inside to outside and torqued them that way too. If you went from one end to the other that would cause a bind. Also make sure the caps are setting in the block correctly.
 
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