Re: Re: Want to Talk to Experienced Engine Rebuild

Posted by george md on November 26, 2003 at 22:44:54 from (67.74.241.6):

In Reply to: Re: Want to Talk to Experienced Engine Rebuilder posted by Nate on November 26, 2003 at 19:51:54:

Nate ,

It appears that you are quoting the old crank
myth , read the post below.
Undersize bearings do NOT have thicker bearing
material, they have the same amount of bearing
material, but have thicker steel backing .therefore the strength of the bearing has not changed.
Most automotive engines and the older tractor
cranks are not heat treated or surface hardened,
so grinding deeper is not a problem . Grinding
is not the problem , why it had to be ground can
be the problem . Heat treated cranks that have
had a heat related failure are subject to a change
in the hardness or strength due to excessive heat.
Those with nitriding or tufftriding come with a
completely different set of guide lines .
Basically ,if the shaft is not nitrided and
is not a heat treated shaft with a heat related failure , you can grind it to any size that you
can buy bearings to fit.
george

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