The main performance of the cylinder head gasket is: water leakage from the cylinder head gasket, foam or air flow sound; gas infiltrating into the cooling water jacket causes bubbles in the water tank mouth; when serious, it will jet outwards like “open potâ€; if water leaks into the cylinder, the row The trachea emits white smoke, and the severe one sprays water outwards. Causes of cylinder gasket damage include: Inconsistent tightness or tightness of the cylinder head nut; engine overheated and burned cylinder gasket; cylinder head, body and cylinder gasket mating surface is not closely, not smooth or dirty, burning Erosion, etc.; cylinder head gasket is not good quality deformation, lack of elasticity; cylinder liner convex surface is too low.