They sure area a pain to split. I don't feel sorry for you when you tried the felt seal twice. That was just stupid. You know darn well they won't work at all if they don't have the spiral groove.
Did you check the crankshaft to make sure it was straight? d282 was telling me how these cranks will go out of straight if you let the tractors idle too low for too long. I would guess the machine shop checked for that.
Did you check to make sure the seal retainer was flat/straight? My MD retainer was warped like crazy, but a 400 retainer is the upgrade to an MD retainer. The later tractors were cast iron where the old ones were white metal.
In the end, I am pretty sure mine still leaks a little even after I redid it last winter. I haven't investigated much, but I did see a drip or two at the bottom of the bell housing after plowing for a few hours. Mine is felt with a sprial and a 450 seal retainer.
Edit - M Diesel had mentioned to make sure the breather is clear. This will cause a pressurized crankcase. That will help your rear main leak because it is mostly luck that makes them not leak (as much) in the first place.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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