Without disassembling the piston ring, check the wear degree of the piston ring by watching, listening, draining and pouring.

Look: When the engine is running, open the crankcase breather. It can be seen that a stream of mist is continuously discharged from here. As the speed increases, this phenomenon decreases, indicating that the piston has been seriously worn.

Listening: When the engine is running, you can also hear the "hissing, hissing" sound of compressed air leaking through the piston ring in the vent hole, which can be verified externally with a stethoscope. Use a screwdriver with a long wooden handle, one end touches the movement area of the piston in the middle and upper part of the cylinder opposite the fuel injection pump, and the other end is close to the ear.

Consumption: It is determined according to the engine oil consumption and the oil consumption percentage of the fuel-consuming machine. The engine oil consumption is almost unchanged before a certain working period, and it increases significantly after this period. It is generally considered that when the oil consumption accounts for the fuel consumption When the amount is 4%, the piston ring should be replaced, such as Dongfanghong-54 tractor, every 1500 hours of operation, the oil consumption exceeds 15 kg, and the exhaust pipe emits blue smoke, the piston ring should be replaced.

Filling: When the decompression and cranking engine is outside the crankcase ventilation hole, you can hear the "hissing, hissing" air leakage sound of the piston ring. In order to verify whether the above phenomenon is true, you can add an appropriate amount of oil to the inlet port, and then get rid of the crankcase. When the crankshaft is turned, the air leakage sound disappears or is significantly reduced, indicating that the piston opening clearance and side clearance are seriously worn and need to be replaced with new parts.