Re: Bearing Clearances

Posted by KEB on November 21, 2006 at 18:54:17 from (72.19.170.5):

In Reply to: Bearing Clearances posted by Dan Bear Kelley on November 21, 2006 at 14:32:39:

Haven't read the article in question, but I'll hazard a guess that the author was following an original manual. I'm not sure when Plastigage was introduced, but I've got a couple old manuals (50's vintage) that refer to checking clearances by seeing how much drag is introduced with brass shim stock of the appropriate thickness between the bearing surface & journal.

That being said, there are ways other than Platigage to check bearing clearances, but as far as I know none of them are any where near as easy or accurate. I have put new bearings in engines without checking clearances if the crank looked and mic'd OK, but only as an expendient measure when there was some sort of time crunch. So far I've been lucky. You might get away with just measuring the crankshaft journals with a micrometer and assuming the inserts are the right size, although I too have seen mislabled boxes. Somehwere I have a set of wrong-size rod bearings for the 226 flathead Continental in my 56 Willys. It also takes some practice to make good consistent measurements with a micrometer.

Keith

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