The role of the head gasket and structure

Cylinder gasket is used to guarantee seal between the cylinder block and cylinder head in combination with surface, prevent leakage, leakage and oil leakage, it is the most important is the car a gasket. Mat direct contact with high temperature and high pressure gas cylinder, so can easily be ablation in use. Therefore, cylinder pad to heat resistance, corrosion resistance, have enough intensity and certain elasticity and thermal conductivity, thus ensuring reliable seal. Is currently widely used metal - Asbestos cylinder pad, its structure is thin metals asbestos, useful in cylinder mouth made of sheet steel retainer, around the water crossings, oil crossing with copper or edge of the steel reinforcement. Asbestos core has good heat resistance and a set of elastic, mixed with copper scrap or copper wire in the asbestos, in order to enhance its thermal conductivity in addition. And metal skeleton asbestos mat, pure metal gasket and so on. In recent years, some foreign engine started to use heat resistant sealant, completely replace the traditional cylinder pad. Cylinder pad ablation is common cylinder pad ablation due to high temperature and high pressure gas cylinder pad, burning mouth, retainer and asbestos board, cylinder gas leakage, lubricating oil, cooling water leakage. Appear erosion head gasket failure, engine power performance fell, the cylinder pressure is insufficient; Serious when a carburetor tempering, exhaust pipe blasting phenomenon, should be replaced immediately cylinder pad. (1) launched the pilot time work under the heavy load, often produce detonation combustion, lead to local high temperature and high pressure in cylinder and ablation cylinder pad. 2 when fastening cylinder head bolts, not according to the specified requirements, uneven torsion caused cylinder pad are not evenly in the joint surface lead to leap into the cylinder head and cylinder gas. (3) the ignition advance Angle and fuel injection advance Angle is too big, make the circulation of the highest pressure, the highest temperature is too high. (4) cylinder pad quality is poorer, uneven thickness; Uneven, including memory have bubbles, asbestos laid or package is not tight. 5] cylinder head warping deformation and cylinder block surface roughness is super bad, individual cylinder head bolt looseness, untight seal. [6] improper driving operation method, used to fierce refueling door and urgent acceleration, speed, too much pressure cylinder gasket erosion.