anyone know a reputable mercruiser marine mechanic on long island to service a 4cyl 470 mercruiser. I have some yellow blow by that needs to be diagnosed. May need a head gasket? thanks.
give it a qt of MM and call me in the morning
Head gaskets usually won`t cause blow-by.Coolant in the oil maybe.Combustion gas or pressure in the cooling system
Blow-by comes from worn rings creating excessive crankcase pressure.
Could it be just some condensation, is the oil clean or milky.
