Causes of smoking and how to eliminate it

One, black smoke

Cause: It indicates that some diesel atomized particles in the cylinder are discharged without combustion. There are generally three reasons for this: one is excessive fuel supply and the diesel engine is overloaded; the second is the low fuel injection pressure of the injector and the degree of diesel atomization is poor; the third is that the fuel supply is too late and the engine temperature is low. Remedy: For diesel engines with excessive fuel supply, appropriately reduce the fuel supply and control the operation within normal load; for diesel engines with low fuel injection pressure, repair or replace the fuel injector in time to increase the fuel injection pressure; For diesel engines whose fuel supply is too late, the fuel supply advance angle should be adjusted. When adjusting, first unscrew the two screws that fix the keyboard on the timing gear, and turn the keyboard clockwise to make the fuel supply advance angle of 16-19 degrees and the relative amplitude of 22.5-28.5 mm. At the same time, make the engine The temperature is maintained at 80-90°C.

Second, white smoke

Cause: It indicates that the atomized diesel fuel injected into the cylinder is not completely burned and then discharged. There are three main reasons for this: First, the fuel injector is stuck, insufficient pressure, and poor diesel atomization; second, there is too much air in the oil circuit, and there is water in the diesel; third, the reason is the same as the black smoke, and the fuel supply is too late. Elimination method: check the fuel injector, adjust or replace the fuel injector; check the fuel circuit, remove the air in the fuel circuit, and use standard diesel; adjust the fuel supply advance angle, the same as the adjustment method when black smoke is emitted.

Three, blue smoke

Cause: It indicates that the engine is burning oil. There are three main reasons for this: one is that the piston rings go to the opposite side and the oil enters the cylinder; the other is the oil level of the oil pan of the air filter, which exceeds the height of the ring groove; the third is that the gap between the duct and the valve stem is too large. Remedy: Adjust the piston ring so that the opening of the ring is staggered by 120 degrees or 180 degrees. The ring opening should avoid the piston pin hole and the direction where the side pressure is greater; adjust the oil level of the air filter oil pan to reduce it To below the height of the ring groove; if the gap between the catheter and the valve stem is too large, parts should be replaced and the gap should be reduced. The normal clearance between the two is 0.05-0.12 mm.