What to Do About Oil Leakage from the Engine Cylinder Head Cover?
1 Answers
Engine oil leakage is mostly caused by three reasons: leakage from the cylinder head cover gasket, loose screws in the oil passage holes, or sand holes in the cylinder head cover itself. Below are the relevant details about engine oil leakage: 1. First, check for any external oil leakage. Pay special attention to whether there is leakage at the front and rear crankshaft oil seals. If the front crankshaft oil seal is broken, damaged, aged, or if the contact surface between the crankshaft pulley and the oil seal is worn, it can cause oil leakage at the front of the crankshaft. If the rear crankshaft oil seal is broken or damaged, or if the oil return hole in the rear main bearing cap is too small, obstructing oil return, it can cause oil leakage at the rear of the crankshaft. 2. If there is oil leakage at both the front and rear oil seals, or if oil seeps from multiple areas such as the front and rear cylinder head covers, front and rear valve lifter chambers, oil filter, and oil pan gasket, but no obvious leakage point can be found, check the crankcase ventilation system. Clean the crankcase ventilation pipes, especially checking if the PCV valve is malfunctioning due to carbon buildup and sticking. Poor crankcase ventilation can significantly increase the pressure inside the crankcase, leading to oil seepage in multiple areas. 3. If oil leakage persists after tightening the oil filter and some oil line connections, check whether the oil pressure is too high or if the oil pressure relief valve is malfunctioning.
