Idle oil pressure when up to operating temp is a good indicator of the health of the bottom end.
Every manufacturer is different, but if the pressure drops to near nothing, the bearings, and possibly the oil pump, are getting worn.
A leaking rear main seal can also be an indicator of worn main bearings. Worn bearings cause the crank to bounce around and beat the seal out, along with passing too much oil between the bearing and journal, flooding the seal area.
Don't be tempted to put undersize bearings on a standard crank! Cranks wear more on the outside of the rod throws because that's where the maximum load is applied. Even if it measures small there, 90* from there it will still be near standard specs. Too tight is worse than too loose!
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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