Estimated cause of wear

 It is believed that the main cause of wear is the friction related sliding between valve seat. This slippage is caused by the deflection of the valve the cylinder head. Under the action of bursting pressure, the pressure on the valve seat is very high. It can be imagined that under high pressure, even a small slip, dry friction will cause wear. Also, the cylinder head air valve will be deformed. Why is the wear of exhaust valve valve seat much lighter than that of inlet valve? This is because there is a very thin non-metallic layer on the working surface of the exhaust valve valve seat. These things are made up of oil, ash soot left in the exhaust gas. It prevents the metal contact between the valve seat the valve seat, so the friction movement will cause damage. However, due to the blow in of the air inlet, on the surface of the air inlet valve, on the one hand, it prevents the air inlet cleaning the residual oil dust on the surface of the air inlet valve the valve seat, so as to cause dry friction damage.

Improvement measures

1 increase the valve rotating mechanism 

2 reduce the deformation of each part

(1) There must be a gasket between the cylinder head the valve body, a certain degree of compression should be carried out to reduce the assembly deformation of the bottom surface of the cylinder head. 

(2) reduce the deformation of intake valve disc. 

(3) strengthen the rigidity of valve seat. 

(4) improve the casting quality of the cylinder head, ensure that the water chamber is unobstructed the size is correct, so that the wall thickness temperature distribution of the cylinder head are uniform, the cooling water is sufficient (especially the valve area).