The cylinder head gasket, also called the cylinder liner, is located between the cylinder head and the cylinder block. Its function is to fill the microscopic pores between the cylinder block and the cylinder head, to ensure a good sealing at the joint surface, thereby ensuring the sealing of the combustion chamber. Prevent cylinder leakage and water jacket leakage. Depending on the material, the cylinder head gasket can be divided into metal-asbestos gaskets, metal-composite gaskets and all-metal gaskets.