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 - Using Your Tractor: Creating a Seed Bed - by Chris Pratt. When I bought my first old tractor, I had only one idea in mind. It wasn't the preservation of old iron since at that time, I was unaware that people even did this. It wasn't to show off my restoration skills (though I had tried my hand at a couple of old motorcycles in my teens and if I recall correctly, those old motorcycles were sold in boxes about one quarter finished). It wasn't to relive memories of Grampa, Dad or myself out on the back 40 nursing the Farmall pulling too many b
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