Posted by D Slater on November 20, 2007 at 19:23:00 from (72.65.155.230):
In Reply to: Re: Farmall M Bearings posted by Mike Farmer on November 20, 2007 at 12:23:49:
Sorry, didn't know you were out of country. Just looked up information on crankshafts to double check my memory. Some IH information calls the hardening tacco hardened and some say induction hardening. This next is a from IH engine information. The hardening is deep enough to allow grinding the shaft to .030 undersize and still have a hardened bearing surface. Hardening of the bearing journals by this method leaves a tough unhardened core for strength. Also have a listing of IH bearings furnished for engines up until 1962. .032 is the biggest undersize listed for a M. Also by then they were not excepting any crank cores for credit that had a part # suffix below DD. That would be all original US M below engine serial # 278050. Also .032 was sold for worn .030 undersize cranks. Listing does show .060 bearings for some british engines. Is your crankshaft # 45571 D, DA, DB, etc?
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