That's correct, you need to support the weight of the crankshaft (push it up to the top of the main bearings) to accurately measure the clearance on the bottom. What I taught my students to do was take and cut a strip off of the time cards that we had in school, and lay it on a couple of the lower main bearing inserts and then measure the other bearings. The time cards were the thickness of the old post cards. It worked good and it also prevented the crank from turning and messing up the plastic gauge.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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