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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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