Insufficient power for diesel engines

1, see the smoke up and down, check the wear and tear in the engine work, open the oil cover, if there is a stock of smoke emerging from the oil cover, said under the smoke, under the smoke phenomenon is serious, that the piston, cylinder liner, piston Rings and other serious wear and tear. Open the valve chamber cover, if there is a trace of blue or white smoke emerging from the valve root (valve working face), said smoking, smoking is serious, indicating that the valve or valve seat wear serious or ablation, or valve clearance Too small or even no gaps. By observing the smoking situation, you can directly see which valve or cylinder is leaking and repair it in time. 2, see coke, check engine diesel exhaust port was dark gray, the surface covered with a layer of white frost, carbon layer is very thin, indicating that the diesel engine working conditions are good. Carbon black color, but not wet, indicating that the diesel engine slightly burned oil, should be promptly removed; a cylinder exhaust thickness is significantly higher than the other cylinder exhaust port, indicating that the cylinder injector malfunction or cylinder seal Deterioration should be repaired or replaced; individual exhaust outlets moist or organic oil, indicating that the cylinder a large number of rows of oil, should be repaired; each cylinder vents are thick carbon layer, and the color darker, more The operating temperature is too low, or the fuel injection is too late, and the diesel fuel burns seriously. It should be used correctly and adjusted in time. 3, look at the water temperature, check the cooling system If the engine works when the cooling system water temperature is too high (more than 100 °C), you can explain the engine cooling water chamber scale is too thick or the cooling system related parts (thermostat, pumps, fans, etc.) are inefficient Or failure. 4, see the valve timing, check the valve phase After long-term work, the timing gear, cam surface, follower column and tappet will wear, so that the intake valve, exhaust valve opening and closing time delay and deviate The best gas distribution phase will reduce the aeration efficiency and reduce the engine power. Therefore, it is necessary to regularly check the phase of the engine's gas distribution. If it does not meet the requirements, it should be adjusted in time. 5, look at the compression force, check the leakage to S195 diesel engine as an example, the method of checking the compression force is not decompression under the situation cranking the crankshaft, when the shake to the compression force is greater, then shake up a strong, loose Put the handle but do not leave the handle. If there is a large rebound force at this time, the compressive force is very good. Otherwise, the compressive force is poor. The reason for the poor sealing performance of the cylinder is that the valve has no clearance or the clearance is too small, the clearance between the piston and the cylinder sleeve and the end face of the piston ring is too large, and the ring groove deposits carbon. When the engine is working, if there is a “puff” sound when it is close to the air filter, the leak is related to the valve. At this point, the cause of the failure can be confirmed by the combination of smoking conditions. 6, to see smoke, check the normal operation of the smoke engine, generally do not smoke or take some light gray smoke, sometimes difficult to see with the naked eye. If black smoke is emitted, it indicates that the cylinder contains less oil and less combustion, and if the blue smoke is emitted, the wear gap between the cylinder liner and the piston, the valve, and the valve guide is too large. If white smoke is emitted, the fuel is mixed with water. , Or diesel fuel is not completely burned, and it emerges from the exhaust pipe after gasification. 7, see the fuel injection, check the stuck fuel injection pump injection should not be biased, do not drip oil, oil mist uniform, a reasonable range, can hear the sound of "bashing, flapping" sound, touch the high pressure tubing pulse feeling . Good fuel injection does not completely explain the oil line parts without problems. Therefore, it is also necessary to check whether the supply rod and the fork are stuck or loose. 8, see the ignition, check sooner or later see the ignition is to check whether the fuel injection timing, that is, whether the fuel supply advance angle meets the requirements. If the oil supply is too late (small advance angle), then the diesel engine is difficult to start, the combustion is incomplete, the exhaust gas is smoked, the engine temperature is too high, and the power is insufficient; if the fuel supply is too early (the advance angle is too large), the diesel engine will knock when working. Slamming, easy to damage parts, easy to reverse when starting, but also shadow. Power to the engine. Author: Liaoning Liaozhong County Transportation Management Office Car Purchase Office

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