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Want to Talk to Experienced Engine Rebuilder
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Posted by moonlite on November 23, 2003 at 16:31:13 from (64.82.207.59):
I have rebuilt several engines and have always been told that for long reliable service that a crankshaft should not be ground more than .020. I know that there are engines of similar size, speed, and performance which may have crank journals much larger than others so it would seem unreasonable that a crankshaft is designed in such a way that it could not perform if the journals were much smaller. Could it be that the surface of the journal has some different characteristics in the metal than the inside portion of the shaft? Are there other considerations other than difficulty in finding bearings. I heard of an old GMC truck shaft which was ground to .060 and they had to make a bearing for it. Even the mechanic who did the work doubted it would hold up.
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