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More crank bearings
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Posted by CNKS on January 11, 2005 at 18:19:12 from (204.249.178.138):
Perhaps the question I asked below should have read "how can I tell when a crank needs to be reground?". My assumption, right or wrong, was that if I used plastigage between the old inserts and the journal, and if the clearance was boderline, as a couple are, that new inserts would decrease the clearance to an acceptable level. I can't see how the clearance could be MORE with new inserts. All this assumes that the crankshaft is within spec as to both roundness and journal diameter, and is not grooved or nicked--I am not sure of this and will probably take the crank to a machinist anyway, that does not mean the machinist has to do anything. Another question is, if the crank is slightly out of round, but still within spec, will it cause excess wear on the new insert, which in theory, is a perfect half circle? Sorry for the questions, but rather than take the engine including the crank to someone and saying, "here fix it", I would like to know what's going on.
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