Later Non IH Cadets eliminated the drain hole in the hydro unit, the oil drains back thru the bearing hydro's output bearing. The old IH units with the drain hole has a tiny area to seal...just below the drain hole.
On my next cork gasket replacement job, I'm considering to plug the drain hole in the hydro unit and maybe the rear end. This would increase the area to seal with RTV.
Thoughts?
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