What Causes Valve Cover Oil Leaks?
1 Answers
The main reasons for valve cover oil leaks are: 1. The valve cover gasket has aged and become brittle, losing its sealing ability and causing oil leakage. In this case, simply open the valve cover and replace the gasket. 2. A clogged PCV valve in the crankcase ventilation system leads to excessive internal pressure, eventually causing oil to seep out under pressure. To check if the PCV valve is functioning properly: at idle speed, use your finger to test the vacuum at the crankcase air intake to instantly determine the PCV valve's working condition. Additional information: The cylinder head cover, commonly referred to as the valve cover, is used to seal components like the valve train, preventing dust from contaminating the oil or entering and accelerating wear on valve train components.