1. Black smoke causes and measures: (1) is the diesel pumping machine overload, should reduce the load; (2) is the oil supply advance angle is wrong, should be adjusted according to the provisions; (3) is the injector is not working, should adjust the spray Oil pressure, cleaning the coke deposit hole; (4) Into the exhaust valve clearance is wrong, should adjust the valve clearance; (5) is the air filter or muffler plug, resulting in insufficient intake, exhaust is not clean, Insufficient supply of fresh air and black smoke should clean the air filter element and muffler on time to ensure fresh air supply.
2. Blue smoke causes and measures: (1) is the piston and cylinder wear or piston ring wear is too large, should check the piston and the cylinder and the piston ring wear, timely ram cylinder repair, or replace the new piston ring; (2 ) It is the oil ring and the ring groove glued, loses the oily effect, causes the oil to break into the cylinder, should replace the new oil ring and the ring groove; (3) is the oil is too much, should inspect the oil ruler, discharges the excess oil; (4) ) Because the piston ring is installed and the oil runs into the cylinder, the piston ring should be properly installed. (5) If the engine temperature is too high and the oil evaporates, the cooling water should be replaced to enhance heat dissipation.
3 white eyebrows smoke causes and measures: (1) is the fuel system to enter the water, should check and remove the water in the tank; (2) is the cylinder pad damage, or liner leakage. Should check to repair or replace the cylinder pad and liner; (3) is a bad injector, causing drip nozzle drip, or low injection pressure, should check repair or replace the injector.
4. Automatically extinguish the sound of "sound" to see the "speed" view of the "smoke" can diagnose diesel engine automatic flameout fault.
As the rotation speed gradually decreases, flameout occurs. If there is no abnormal change in engine noise and smoke color, this failure occurs in the crank curve. Generally check whether the fuel is used up, if the fuel tank ventilation hole is blocked to form a vacuum, whether the oil road is blocked, whether it is into the air, the fuel injection pump and the sprayer injection; if the exhaust pipe is in heavy black smoke, it may be severely overheated. The load or fuel advance angle is too small, the fuel is not fully burned, and the air filter and the intake pipe are checked for clogging. Turning off occurs when the rotational speed is unstable, and the exhaust pipe emits white smoke. Most of the faults are caused by the large amount of moisture in the diesel fuel. If the exhaust pipe is still white smoke and extinguishes after the new oil is replaced, the cylinder mat may be burned out and a new cylinder head gasket should be replaced.
A sudden decrease in the rotational speed occurs and the flame is extinguished. The exhaust pipe emits black smoke. The main causes of failure are: insufficient or excessively lubricating oil, which causes poor lubrication of the relative moving parts such as the crankshaft and the bearing bush, resulting in the burning of the bearing bushes. After the overhaul, the clearance between the piston and the cylinder is too small. When the engine temperature increases, The piston is stuck in the cylinder.
The chaiqu engine suddenly ignited and accompanied by abnormal noise. The cause of failure can be judged as: crankshaft or piston pin broken; connecting rod screw broken or connecting rod nut off; valve spring broken, valve falling, etc.
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