1, see the smoke up and down to check wear When the engine is working, open the oil cover, if there is a stock of smoke from the oil outlet, said smoke. The phenomenon of serious smoke emission shows that the pistons, cylinder liners, piston rings and other parts are seriously worn. Open the valve cover, if there is a trace of cyan or white smoke from the valve root (valve face), said smoke. There is a serious phenomenon of smoke, which indicates that the valve or valve seat is heavily worn or ablated, or the valve clearance is too small or even without clearance. By observing the smoking situation, you can directly see which valve and which cylinder is leaking and repair it in time. 2, see coke check operating conditions Diesel exhaust carbon deposit was dark gray, the performance like a layer covered with white frost, carbon layer is very thin, indicating a good working condition of the diesel engine; carbon black color, but not wet, indicating Diesel engine oil burned lightly, should be promptly removed; a cylinder exhaust port carbon deposition thickness is significantly higher than other cylinder exhaust port, indicating that the cylinder injector is not working or cylinder sealing performance deterioration, should be repaired or replaced; individual row Moisture or organic oil mouth, indicating that the cylinder a large number of rows of oil, should be repaired; each cylinder exhaust port are thicker carbon layer, and darker color, mostly due to low working temperature, or fuel injection too late, Due to the serious post-combustion of diesel fuel, it should be used correctly and adjusted in time. 3, look at the water temperature 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 cooling system related parts (thermostat, pumps, fans, etc.) are inefficient or Failure. 4, see the valve timing to check the gas phase after long-term work of the engine, the timing gear, cam surface, follower column and tappet will wear, so that the intake valve, exhaust valve opening and closing time delayed and deviated 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, to see if the leak leaked by the S&P diesel is an example, the method of checking the compression force is to crank the crankshaft without decompression, and when it is shaken until the compression force is large, shake it up again. Loosen 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. 6, see the smoke and smoke engine in the normal working place, generally do not smoke or take some light gray smoke, sometimes difficult to see with the naked eye. If black smoke is emitted, the cylinder has less oil and less combustion. If the blue smoke is emitted, the wear gap between the cylinder liner and the piston, the valve and the valve ground pipe is too large. If the white smoke is emitted, the fuel is mixed. Water, or diesel, is not completely burned, and it emerges from the exhaust pipe after gasification. 7, see the fuel injection check stuck injection fuel injection pump should not be biased, not drip, oil mist uniform, proper range, work can hear a clear "bashing, flapping" sound, hand touch high pressure tubing pulse sense. Good fuel injection does not fully explain the problem of oil line parts. 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 Aspect 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 affect the engine power.
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