Thank you, Used Red MN. I did not significantly clean it up, although I did take off the bell housing plate that is mounted between the flywheel and the engine block to get a better look at the seal, and I removed some trash and hay that had somehow accumulated in there.
My thought was the same as yours: it does not look like the rear main seal is actually leaking that bad, if at all. I did an in-frame overhaul on this engine in 2022 (my first one), and the engine starts and runs great, and it has a lot of power. It does not smoke. I know it is leaking bad, though, because it accumulates a huge puddle under it. I definitely believe that it will leak 1-2 quarts per day.
When I bought it in the spring of 2022, it only had compression on two cylinders. I replaced the valves (two were completely rusted out and the remnants of the valves had destroyed two pistons), had the head milled, and replaced the pistons and crankshaft bearings. I had a friend who is a mechanic help me roll the rear main bearing in place, and I am worried that we might have messed something up in terms of sealing when we were messing with the main bearing. We never replaced the rear main seal because I never split the tractor. I do not recall installing any sealing packing on top of the rear main bearing cap, and if so, I guess that would be the problem. It is also possible that my friend installed something there and I do not remember it.
Should I fix that by dropping the oil pan once I get the tractor back together, removing the rear main bearing cap, and resealing it? What packing should I use there?
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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