Is the valve cover broken
There are generally several reasons for the damage of valve cover gasket. The first is that the bolt is loose, the second is the engine blowby, the third is the crack of valve cover, and the fourth is that the valve cover gasket is damaged or not coated with sealant.
During the compression stroke of the engine, a small amount of gas will flow to the crankcase between the cylinder wall and the piston ring, and the crankcase pressure will rise over time. At this time, the crankcase ventilation valve is used to lead this part of gas to the intake manifold and inhale it into the combustion chamber for reuse. If the crankcase ventilation valve is blocked, or the clearance between the piston ring and the cylinder wall is too large, resulting in excessive air channeling and high crankcase pressure, the gas will leak out in places with weak sealing, such as valve cover gasket, crankshaft front and rear oil seals, resulting in engine oil leakage.
As long as you apply the sealant, tighten the bolts, and the valve cover is not cracked or deformed, it shows that the valve cover is good. If you are not at ease, you can use a ruler and a thickness gauge (feeler gauge) to measure the flatness of the valve cover to see if it does not deform.
