Why would the motor on a 92 Topaz leak oil through the top?

In: Mercury Topaz

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Answer

Chances are the oil return ports down through the cylinder heads are plugged and the oil is comming from the valve cover gaskets. The valve cover gaskets are not intended to seal completely under a pressurised system. so when the oil can't return to the oil pan and the pump keeps pumping the oil upward then it pressurizes the valve cover and forces the oil out of the gasket. try cleaning the oil return ports and change brands of oil. I prefer valvoline because it doesn't contain any parifine to clog the return ports.

First answer by Joe Atwell. Last edit by Joe Atwell. Question popularity: 77 [recommend question]

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