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I understand you don't want to put a lot of money in this tractor right now, but if you don't get this right, and it throws a rod, or spins a main bearing, you're looking at a LOT more money to get it right the second time. The back of your bearing shell are probably marked STD, .001, .002, .010, or .020, but if the shaft is worn, especially out-of-round, just putting the same inserts back in may not do much good. I would try to find someone with engine machinest knowledge to mic. the crank for you, and see just what shape it is in. Alternately, you could obtain a micrometer and do it yourself, with a little studying and practice. If the shaft is not worn too badly, or too egg-shaped you may do OK with a set of bearings, but it sure is a good idea to know precisely what you're dealing with. Having the crank re-ground would cost from $50.00 to $100.00, and, of course the tractor would have to be split to get the crank out, but if there is significant wear to the journals, this is still the best long-term fix.
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