The cylinder pad, also known as the cylinder liner, is located between the cylinder head and the cylinder block. Its function is to fill the microscopic pores between the cylinder head and the cylinder head, to ensure good sealing at the joint surface, and then to ensure the sealing of the combustion chamber, to prevent air leakage and water jacket water leakage. According to the different materials, cylinder gaskets can be divided into metal - asbestos gaskets, metal - composite gaskets and all metal gaskets. The cylinder pad is a seal between the top of the body and the bottom of the cylinder head. Its role is to keep the cylinder seal does not leak, keep the coolant and oil flowing from the body to the cylinder head does not leak. The cylinder pad bears the pressure caused by tightening the cylinder head bolt, and is subjected to the high temperature and high pressure of the combustion gas in the cylinder, as well as the corrosion of the oil and coolant.
The gaspad shall be of sufficient strength and shall be resistant to pleasure, heat and corrosion. In addition, a certain amount of elasticity is needed to compensate for the roughness and unevenness of the top surface of the body and the bottom surface of the cylinder head, as well as the deformation of the cylinder head when the engine is working
