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How to adjust the valve clearance of the car?

2022-07-18

 The function of the car valve is to input fuel into the engine and discharge the exhaust gas. The common multi-valve technology is that each cylinder is arranged with 4 valves, and the 4 cylinders are a total of 16 valves. The "16V" we often see in the car data is Indicates that the engine has a total of 16 valves.
The valve clearance is set to ensure the normal operation of the valve mechanism of the internal combustion engine. Since the valve mechanism is in a high-speed state and the temperature is high, the parts such as valve lifters and valve stems are heated and stretched, and they will be fully automatically opened. valve, so that the valve and valve seat are not tightly closed, resulting in air leakage.
The valve clearance is usually when the engine is in a cold state, and a proper clearance is left in the valve foot and its transmission mechanism to compensate for the expansion of the valve after heating. This reserved clearance is called the valve clearance. Generally, the valve clearance of the exhaust valve is slightly larger than that of the intake valve.
 
When adjusting the valve clearance, first loosen the lock nut and adjusting screw, insert a feeler gauge with the same thickness as the valve clearance value into the gap between the adjusted valve foot and the rocker arm, rotate the adjusting screw, and pull the feeler gauge back and forth. , when you feel that the feeler gauge has a slight resistance, it is necessary to recheck after tightening the lock nut. If the gap changes, it needs to be re-adjusted.
 
Usually, the methods of valve clearance adjustment mainly include cylinder-by-cylinder adjustment method and two-time adjustment method.
 
The above content about the adjustment of car valve clearance, I hope to help everyone!