Posted by used red mn on August 31, 2018 at 23:02:47 from (75.73.112.20):
In Reply to: Re: engine rebuilding? posted by jimg.allentown on August 31, 2018 at 12:26:33:
Yep agreed, rod or main crankshaft bearing journals are finish ground to a certain diameter spec. For EXAMPLE say your engine has a specified rod bearing journal of 2.000 inches it wears down below the allowed tolerance and needs resized. So a machine called a crankshaft grinder is used to very precisely grind the journal down 0.010” undersize. So now the bearing insert halves needed are 0.005 inches thicker to fit the smaller diameter journal. So they would now fit the new small diameter rod journal that is 1.090 inches. That ...undersize... diameter is how normal machinists nomenclature or naming would refer to them. I agree with finding someone to mentor you through this process there are a lot of steps that need performed properly during and engine rebuild to ensure longevity.
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