Reply to "Vent Valve Covers?"

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.

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