How big is the valve clearance?

Generally, when the valve clearance is cold, the intake valve clearance is 0.20mm~0.30mm, and the exhaust valve clearance is 0.25 mm ~ 0.35 mm The valve clearance of different types of engines is determined by the engine manufacturer according to the test. Please refer to the maintenance manual for details. Valve clearance is the clearance between the end of the valve rod and the parts of the valve train when the valve is completely closed, which is called valve clearance.

If the valve clearance is too small, the engine may leak air because the valve is not closed tightly in the hot state, resulting in power reduction and even burning the valve. Excessive valve clearance will produce impact noise between transmission parts and between valve and valve seat, which will accelerate wear. At the same time, the duration of valve opening will be reduced, and the inflation and exhaust of the cylinder will be worse.

Valve clearance is determined by the manufacturer during the design test. The engine is a standard and can be adjusted according to the standard. Ignition advance or delay will affect the power of the engine. At present, the ignition timing is generally adjusted by feeling. Generally speaking, it is better to refuel smoothly, without smoking or sudden explosion. After adjustment, it is best to go through a road test. Million car purchase subsidy