What is the valve clearance of Yuchai engine?

Yuchai's engine is equipped with an engine manual. It is pointed out in the manual that if there is no manual, it can be adjusted with 0.3mm suction valve and 0.4mm exhaust valve. Some summaries of valve clearance are as follows: 1. The setting of valve clearance is to ensure the normal operation of the valve train of internal combustion engine. Because the valve train is in a high-speed state when working, the temperature will rise accordingly. 2. When the tappet, valve stem and other parts are extended due to heat, the valve will automatically push open. Because the valve and valve seat are not properly connected, air leakage will follow. 3. In order to avoid the above air leakage phenomenon, when designing the valve train, it is necessary to leave a certain gap between the rod end of the intake and exhaust valve and the adjusting screw on the tappet (or rocker arm). This clearance is the valve clearance.