How to adjust the valve clearance of van?

For the van you mentioned, I think the valve clearance is adjusted by the valve clearance adjusting screw! \x0d\x0d\ Intake valve clearance is generally 0.25~0.3mm (cold car) \ x0d \ Exhaust valve clearance is generally 0.3~0.35mm (cold car). Various cars may be different! \x0d\\x0d\ The engine with too small clearance is not closed correctly due to thermal expansion in hot state, resulting in power reduction and even burning out the valve! \ x0d \ x0d \ Excessive clearance will increase the impact sound between transmission parts and between valves and valve seats, and accelerate wear! At the same time, it will also make the continuation angle of valve opening smaller, and the inflation and exhaust of cylinder will become worse!