Michael McKelvey posted:
Even with my CB breather/filler with enlarged hoses and a sand seal, I am still getting oil behind the crank pulley.
@Michael McKelvey I have this issue on my engine. It's not much oil, just enough to make an annoying little oil stain on the engine tin. I cannot detect blow by from the oil filler. However, I am running an aftermarket aluminum pulley and feel that it may be the problem. My plan is to replace the pulley with a stock one. The oil return grooves on the hub of a stock pulley are much deeper and sharper than the aftermarket pulley. I am hoping that this will help return the oil to the crankcase.