There are seven factors that affect cylinder sealing, including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other issues.
For the measurement of cylinder compression pressure, it is mainly the pressure at the end of compression in a four-stroke gasoline engine. Due to factors such as the cylinder pressure and the viscosity of the engine oil, as well as the cylinder piston group, whether the adjustment of the valve mechanism is correct, the sealing of the cylinder gasket, etc., when measuring the pressure of the cylinder of a Roewe Car engine, the cylinder can be diagnosed. The sealing condition of the piston group, if the piston ring, valve, and cylinder gasket sealing is good, then the valve clearance must be appropriate.
Our main method for testing the sealing of Petrol Car engines is to first use compressed air to blow away the dirt around the spark plug, and then remove the spark plug. For gasoline, the secondary high-voltage wire of the ignition system should be pulled out to ensure reliable operation. Grounding, this is to prevent electric shock and fire. Insert the cone-shaped rubber plug of the special cylinder pressure gauge into the spark plug hole for measuring the cylinder. It must be straightened and pressed tightly. For the special throttle valve, it must be set In the fully open position, the starter must drive the corresponding crankshaft to rotate. If the needle indication of the pressure gauge is maintained to a certain extent, there must be a certain stop of rotation after the pressure reading. Then remove the pressure gauge and write down the reading.