What causes blowby in a Cummins?
What causes blowby in a Cummins? Typically, blow-by is cylinder pressure leaking past the piston rings into the crankcase. Commonly, it starts as cylinder glazing or carbon forming in the top ring grooves, both of which allow cylinder leak down, and some oil burning. Oil burning produces further ring deposits, and more blow-by. Where does the oil come from in a Dodge 3500? I have 2004 Dodge 3500 w/ 5.9 Cummins , at about 80,000 miles I had excessive oil fumes coming from underneath the hood of the truck . Fumes came from the slobber tube . What are the...