Engine cylinder tightness detection There are seven factors that affect the cylinder tightness, include cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other issues.
What are the commonly used diagnostic methods? It mainly measures cylinder pressure, crankcase blow-by gas, cylinder leakage and leakage rate, intake pipe vacuum, and vibration measurement of abnormal noise caused by excessive wear of cylinder piston group. Wear metals in crankcases are determination of particle content.
For the measurement of cylinder compression pressure, it is mainly the pressure at the end of compression of a four-stroke engine. Whether the adjustment of the valve train is correct due to the pressure of the cylinder, the viscosity of the oil, and the coordination of the cylinder and piston groups, Factors such as the sealing performance of the cylinder head gasket.
So when measuring the pressure of the engine cylinder, the sealing condition of the cylinder piston group can be diagnosed. If the sealing performance of the piston ring, valve and cylinder gasket is good, the clearance of the valve must be appropriate.
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