At present, in some regions, diesel engines are not only the main driving force for farming and drainage and irrigation machinery, but also the main driving force for livestock husbandry and processing machinery. When diesel engines are used as a power source for normal operations, different colored smokes, such as black smoke, white smoke, and blue smoke, are sometimes emitted. The occurrence of this phenomenon indicates that some internal faults have occurred in the diesel engine and it is necessary to take effective measures in time and quickly eliminate it.
The occurrence of black smoke in the diesel engine indicates that some of the diesel atomized particles in the cylinder are discharged without being burned. There are generally three causes: First, excessive fuel supply, diesel engine overloaded operation; Second, the injector fuel injection pressure is low, the degree of diesel atomization is poor; Third, the oil supply is too late, the engine temperature is low. The method of elimination is: for diesel engines with excessive oil supply, the amount of fuel supply should be appropriately reduced and the operation should be controlled within the normal load; for diesel engines with low injection pressure of injectors, the injectors should be promptly repaired or replaced to increase the number of injectors. Oil pressure; For diesel engines that supply oil too late, adjust the supply advance angle. When adjusting, screw out the two screws fixed on the timing gear and use the clockwise direction to move the keyboard so that the supply advance angle is 16 -19 degrees, with a relative amplitude of 22.50-28.50 mm, while keeping the engine temperature at 80-90°C.
The phenomenon of white smoke occurred in the diesel engine, indicating that the atomized diesel fuel injected into the cylinder was discharged without being completely burned. There are three main reasons: First, the injector stuck, the pressure is insufficient, diesel fuel atomization is poor; Second, the air in the oil circuit is more, the moisture in the diesel oil is more; The third is one of the reasons for black smoke Same late. Excluded method is: check the nozzle, adjust or repair the nozzle, need to change should be replaced; check the oil, remove the air in the oil, and use standard diesel; check the supply advance angle, according to black smoke Adjust the method of supply advance when adjusting.
The phenomenon of blue smoke in the diesel engine indicates that the engine is burning oil. There are basically three main causes: First, the piston rings go to the opposite end, the oil into the cylinder; Second, the air filter oil level of the air filter exceeds the ring groove height; Third, the gap between the catheter and the valve stem is too large . Exclusion method is: to adjust the piston ring to the opposite, so that the opening of the piston ring at an angle, staggered 120 degrees or 180 degrees, the ring opening should be away from the piston pin hole and the direction of the side pressure; air filter If the oil level of the oil pan exceeds the height of the ring groove, the oil level should be reduced below the height of the ring groove; if the gap between the guide pipe and the valve stem is too large, replace the parts, re-assemble and reduce the gap so that the gap between the two The gap is 0.05-0.12 mm.
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