I see there is still some confusion, so I pulled it down some more. fleetwin, pressurizing the crankcase probably would only lead to a false diagnosis because there is no vacuum to the intake manifold if it isn’t running. However, it may be useful to diagnose the carbon seal leaking. Yes, you can see the bleed hole by removing the carburetor. But you can’t see the one in the oil collection groove without splitting the case.
OK, again, this is a 1955, with lip seal in bearing, no carbon seal. But I am sure they are interchangeable.
Note the oil collection groove that grabs any oil that gets past the bearing shell. That grabbed oil passes through the little hole, back to the intake manifold. Note the vertical slot from the groove. That drains off any oil that gets above the bearing in spite of the return groove.
You can also plainly see the oil supply from the lower bearing.
(Nice clean motor, huh?)
