Actually, the two petcocks are "hold-overs" from the days when these tractors ran on distillate or "tractor fuel". This fuel was a "light" fuel and some leakage past the rings did occur. You were to drain it down to the lower petcock each morning and re-fill with fresh oil before you started the tractor. (This is according to my original operators manual for a '44 H that was a distillate burner.) The fuel that gathered in the crank case was lighter than the oil, so it settled to the top of the crank case. If you didn't drain it off, it would contaminate (dilute) the oil and would cause excessive wear on the rods and mains. These old tractors didn't care if they had too much oil, as the crank case is not sealed and relied on free flowing ventelation to remove the unburned gasses from the crank case. Subsequently, the crank case is not sealed and could not build up pressure from too much oil. Hence, no dip stick, as you do not need to know if the crankcase was "too full". My book recommends 30 weight oil in the summer and 20 weight in the winter. If you ran the tractor in below zero weather, 10 weight was recommended. The "mulit-grade" oils weren't invented yet. I have used 10W-30 or 10W-40 in my H for years now and have no problems with it. It has been in the family since it was new. It does get used for more than parades. If oil does not run out the top petcock, I dump in a quart, make sure it rund out the petcock, close it and go to work. If it doesn't run out in a minute or two, I add another quart, no big deal if its "too full". (My $0.02 worth. jal-SD)
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