What are you using to measure with? Being just a whisker out of square will distort your measurement if you're using a caliper. the wider anvils of a .0001 micrometer will give you better and more consistent measurements. Are you doing this in-frame from under the tractor? That might be another factor. You want to be real good with a mic to be taking measurements in a tight space like that while working upside down. Awkward positions don't lend themselves well to consistent measurements.
caterpillar guy is right on the money. You need to be measuring at two or three points on each and at least two directions. If the crank is worn down that much, you might find them out of round, too, at which point you should probably pull the motor and have the crank turned down to .020 under.
I don't know how you'd be able to get a reliable measurement on your mains without pulling the motor and crank.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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