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What is the method for adjusting valve clearance?

1 Answers

DiGage

07/30/25 1:11am

Valve clearance adjustment method is: according to the cylinder ignition sequence, determine a cylinder piston in the compression top dead center position, you can adjust the intake and exhaust valve clearance of this cylinder; after adjusting, turn the crankshaft, and gradually adjust the valve clearance of other cylinders according to this method. Valve clearance is divided into cold engine value and hot engine value, and the measurement should be carried out in accordance with the specified state of the vehicle. Valve clearance is when the engine is working, the valve will expand due to the increase in temperature. If there is no gap or the gap is too small between the valve and its transmission parts in the cold state, the thermal expansion of the valve and its transmission parts in the hot state will inevitably cause the valve to close loosely, resulting in air leakage during the compression stroke and power stroke of the engine, thereby reducing power, and in severe cases, it may even be difficult to start. In order to eliminate this phenomenon, a certain gap is usually left between the valve and its transmission mechanism during cold assembly of the engine to compensate for the expansion of the valve after heating. This gap is called valve clearance.

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