为什么要进行气门间隙调整（Why do the valve clearance adjustment）.docVIP

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为什么要进行气门间隙调整（Why do the valve clearance adjustment）.doc

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为什么要进行气门间隙调整（Why do the valve clearance adjustment）

为什么要进行气门间隙调整（Why do the valve clearance adjustment） The engine under cold state, when the valve is closed when the clearance between the valve and drive part is called the valve clearance. The gap is too large: the inlet and exhaust valve opened later, shorten the exhaust time, reducing the height of valve opening, change the normal distribution phase of the engine, due to insufficient air intake, exhaust and net power decline, in addition, also the parts of the gas distribution mechanism of the impact wear speed increase. The gap is too small: engine parts, thermal expansion, the valve open, the valve is not tightly closed, resulting in leakage, power down, and the sealing surface of carbon deposition or burn the valve, or valve piston impact. Gas distribution mechanism of the hydraulic tappet without valve clearance. First we need to know the gap of the valve rocker arm and the valve (the valve clearance) exists, because the top of the exhaust valve are installed in the combustion chamber, the temperature is the highest, in order to save space to expand, so we must have a gap, as for the valve clearance clearance The size of [1] for different manufacturers to design and inconsistent, usually the valve clearance between 0.2~0.25 mm, while the exhaust valve clearance due to thermal expansion than the inlet valve side, so the gap is bigger, generally between 0.29~0.35. Between the engine valve rocker and the valve through the action and wear for a long time, the gap will become more serious, so the only valve clearance adjustment. However, not all cars are required to adjust the valve clearance, some vehicles belonging to a hydraulic automatic valve clearance adjustment, do not need to adjust the valve clearance. (1) remove the valve chamber cover. Remove the screw of the valve cover, carefully remove the valve cover, be careful not to damage the valve cover gasket. With oil cloth wipe the valve and the rocker shaft, to facilitate the operation of valve adjustment. (