The engine cylinder of auto parts plays an important role, so how to analyze its tightness test?

There are 7 factors that affect the air tightness of the cylinder, including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other issues.

What are the common diagnostic methods for auto parts? It mainly measures cylinder pressure, crankcase air leakage, cylinder air leakage and air leakage rate, intake pipe vacuum, and vibration measurement of abnormal noise caused by excessive wear of cylinders and piston groups. Metal worn in the crankcase is a measure of particle content.

In order to measure the compression pressure of the cylinder of the auto parts, it is mainly the pressure at the end of the compression of the four-stroke engine. Due to factors such as cylinder pressure and oil viscosity, matching of cylinder piston group, correct adjustment of valve mechanism, tightness of cylinder gasket, etc., cylinder piston group can be diagnosed when cylinder pressure is measured. If the piston rings, valves and cylinder head gaskets are well sealed, the valve clearance should be appropriate.

The test method of the engine sealing of auto parts mainly includes: first blowing off the dust around the spark plug with compressed air, and then removing the spark plug. For gasoline, the secondary high-voltage line of the ignition system should be unplugged to ensure reliable grounding and prevent electric shock and fire.

Insert the tapered rubber plug of the cylinder pressure gauge of the special automobile part into the spark plug hole of the cylinder under test. For dedicated throttles, place them in the fully open position. When positioning, the starter must drive the corresponding crankshaft to rotate. If the pointer of the pressure gauge has a certain fixed force, it must stop rotating after reading the pressure. Then remove the pressure gauge and record the reading.