Lawn-boy mower oil leak
 

Hi
I have a lawn-boy self propelled lawn mower with a Tecumseh 6hp engine.
It leaks oil at the top of the engine under the flywheel. I removed the
old top shaft seal and replaced it with a new one and I am still
getting oil leakage from the same place. Could it be that the shaft has
worn too much around the seal lip area and the new seal isn't getting a
good seal there? Or could it be leaking oil around the crankcase
ventilation seal? thanks