There are many joint parts on the engine, and various seals are used to prevent oil leakage, water leakage and air leakage. The gasket looks simple, but if it is improperly selected or installed during maintenance, it will not achieve the expected effect, but it will cause environmental pollution, but it will directly affect its normal work. In order to ensure the sealing reliability of the gasket in use, it must be reasonably selected, carefully prepared and properly installed in the work, and self-selected materials for use. The types and performances of commonly used automotive water tank gaskets are as follows:

(1) Cowhide. It has a certain elasticity, heat resistance and wear resistance, and is used for heat-resistant, wear-resistant and waterproof parts. Therefore, it can be adapted to work under higher temperature conditions to produce a higher strength gasket.

(2) Cork board. It is made of granulated cork bonded with a binder. It has the characteristics of soft texture, large plasticity, good sealing, water resistance and oil resistance. It is often used to prevent water leakage and oil leakage. Pads, valve cover pads and oil pan pads.

(3) Asbestos board. It is a kind of plate made of asbestos fiber mixed with a small amount of bonding material. It has the characteristics of high temperature resistance, heat insulation and sealing, low water content and high tensile strength. It is used to prevent air, hot gas, water and oil seepage. The connection parts, such as air pump, carburetor gasket, etc.