1, under the smoke, check the wear during operation of the engine, open the oil cover, such as strands of smoke emitted from the oil cover, under the smoke, smoke under the serious phenomenon that Baotou Benz parts of piston, cylinder liner, piston ring wear serious.
Open the valve cover, such as a little blue or white smoke from the root valve (valve face) out, said smoking, smoking is serious, that the valve or valve seat wear or erosion, or the valve clearance is too small or no gap. By observing the smoke situation, you can directly see which valve, which cylinder leak, should be repaired in time.
2, coke, check the condition of a diesel engine exhaust port deposition is dark gray, like surface covered with a layer of white carbon layer is very thin, the diesel engine in good working condition. Carbon black color, but not wet, the diesel engine burning oil slightly, should be excluded; a cylinder exhaust port deposition thickness was higher than that of the other cylinder exhaust port of the cylinder, the fuel injector is bad or cylinder sealing variation should be repaired or replaced; individual exhaust wet or oil, the a row of oil cylinder, should be repaired; the cylinder exhaust port deposition layer is thicker and darker color, because of low working temperature, injection or late, diesel engine after burning caused by severe, should be used correctly and timely adjustment.
3, water cooling system, check if the engine operates when the cooling water temperature is too high (more than 100 DEG C), we can conclude that the engine cooling water cavity scale is too thick or cooling related parts (Baotou North Benz parts thermostat, water pump, fan etc.) low efficiency or failure.
4, valve timing, check valve timing engine after a long day at work, timing gear, cam surface, servo column and tappet wear, inlet valve, exhaust valve opening and closing time delayed and deviate from the optimal gas distribution phase machine, the charging efficiency is reduced, the engine power down. Therefore, it is necessary to regularly check the northern Baotou Benz parts engine distribution phase, if not meet the requirements, should be adjusted in a timely manner.
5, compression force, check leakage inspection method, compression force is not the case in the decompression crank crankshaft, when shaking to the compression force, then to shake up, release the handle but the hands do not leave the handle, this time as a great rebound, indicating good compression force instead, show; the compressive force is poor.
The reason of the poor sealing of the cylinder is that the valve has no gap or gap is too small, the gap between the piston and the cylinder liner and the piston ring is too large, and the ring groove carbon deposits and so on. When the engine is working, if it is close to the air filter and hears a hissing sound, it shows that the leak is related to the valve. At this point, combined with the smoke situation, we can confirm the cause of the failure.
6, check the normal work of engine smoke, smoke, do not smoke or take some general light gray white smoke, sometimes it is difficult to see with the naked eye. If the black smoke, the less oil gas cylinder, incomplete combustion; if the blue smoke, the cylinder sleeve and the piston, valve and valve guide wear gap is too large, if the white smoke, the diesel fuel water, or incomplete combustion, gasification of smoke from exhaust pipe.
7, fuel injection, fuel injection pump fuel injection should not lag chaca deflection, drop of oil, oil mist, uniform range is appropriate, can hear the ringing work “Puchi Puchi,” sound, touch the pulse dynamic high-pressure tubing. Good fuel injection does not fully explain the problem of the oil circuit parts. Therefore, it is necessary to check whether the oil supply rod and the shifting fork are stuck or loosened.
8, look at the ignition, check the sooner or later, the ignition is to check whether the injection is correct, that is, whether the oil supply advance angle meets the requirements. Too late (fuel supply advance angle is too small), then the diesel engine difficult to start, incomplete combustion, exhaust smoke, machine temperature is too high, insufficient power supply; early (advance angle is too large), engine when there is a knock, easily damaged parts, easily overturned when starting, but also affect the.