Fault Diagnosis and Removal of Engine Cylinder Gasket Ablation 2
----------Causes of cylinder head ablation
Common cylinder head ablation is due to the impact of high temperature and high pressure gas on the cylinder head gasket, which burns the mouth, retainer and asbestos plate, resulting in cylinder leakage, lubricating oil, cooling
Water leaks. When there is a failure of the eroded cylinder head gasket, the power of the engine is reduced and the cylinder pressure is insufficient;
If the blasting phenomenon occurs, the cylinder head gasket should be replaced immediately.
(1) When the engine works under heavy load for a long time, knocking combustion often occurs, resulting in local high temperature and high pressure in the cylinder and ablation of the cylinder head gasket.
(2) When tightening the cylinder head bolts, the operation is not carried out according to the specified requirements, and the uneven torque causes the cylinder head gasket not to be flat on the joint surface of the cylinder block and the cylinder head.
lead to blow-by.
(3) The ignition advance angle or the fuel injection advance angle is too large, so that the maximum pressure and maximum temperature of the cycle are too high.
() The quality of the cylinder head gasket is poor, the thickness is uneven; there are air bubbles in the mouth of the bag, and the asbestos is unevenly laid or the edges are not tight.
() The cylinder head is warped and deformed, the flatness of the cylinder body is out of tolerance, and individual cylinder head bolts are loose, resulting in poor sealing. (6) Improper driving operation methods,
Heavy accelerator and rapid acceleration, high-speed operation, excessive pressure aggravates the erosion of the cylinder head gasket.
