The refrigerator car engine can be understood as its "heart" and its importance is obvious. Today, the lack of power in the refrigerated truck engine has caused a failure.
If the engine of the refrigerated truck suddenly emits black smoke, but the malfunction disappears after running for a period of time, most of these are caused by poor fuel quality. The impurities in the oil are likely to clog the injector, resulting in poor injection quality and black smoke. After a certain period of time, the impurities are washed away by high-pressure oil. Such failures need not be dealt with. If it is continuous black smoke, check whether the air intake is smooth and there is no deformation of the air intake pipe, resulting in increased intake resistance. First remove the air filter cover, remove the filter element and clean it, and then retry the machine to observe the exhaust of the exhaust pipe. If the smoke is significantly reduced, it means that the air filter is dirty or has problems with installation, which affects the intake air volume and the maintenance of the air intake system should be strengthened.
If the air intake of the refrigerated car is unobstructed, check whether the time for fuel supply is too late and form black smoke.
Most fuel injectors have severely deteriorated injection quality and have poor fuel atomization. They cannot adapt to the shape of the combustion chamber. This results in the formation of a combustible mixture, in which part of the fuel is converted to free carbon. This is also one of the causes of black smoke, so the injectors should also be checked and repaired.
To check whether the fuel quality of a refrigerated truck is in conformity with the standard, a standard diesel engine that meets the engine's normal working environment temperature should be used.
Check if the refrigerator supercharger is working properly. When the supercharger fails, the pressure at the end of the engine intake drops, causing the compression end temperature and pressure to drop, affecting the fuel atomization and combustion temperature.
If the maintenance time of the fuel pump is not long, the exhaust pipe is black smoke, and the power is insufficient, it is necessary to consider whether the fuel pump is over commissioned to make the oil supply too much. Therefore, the fuel supply of the fuel injection pump under various working conditions should be re-calibrated. To make it meet the regulations.
If all of the above are normal and the engine has been operating for a long time, consider checking whether the valve opening height and opening time are correct. The use of a long time, can make valve transmission parts wear, the normal valve timing and valve lift misalignment, reduce the amount of intake air, the amount of residual gas in the cylinder increases, a direct impact on the full combustion of fuel.
For uneven speed, intermittent black smoke, engine power can be diagnosed by oil-by-cylinder inspection.
When a cylinder is cut off, the engine speed is significantly reduced, black smoke is reduced, and abnormal noise disappears. This indicates that the cylinder has too much fuel supply, and the cylinder fuel injection volume should be checked and adjusted. If the change of the engine speed is small and black smoke disappears, the quality of the spray of the cylinder injector is poor, and the injector should be checked and maintained. If the engine speed still does not change, then the cylinder does not work, you should check the cylinder's high-pressure fuel supply conditions, such as the injection pump plunger, the oil valve how to match, pull the fork on the oil adjustment lever on the fixed screw ( Or whether the fastening screw of the ring gear is loose or not, and whether the plunger spring is broken or not. If normal, check the injector's working condition and the cylinder for mechanical failure.
The above is the solution and principle for the black-smoke failure of the refrigerated vehicle engine, which is summarized for everyone, and hopes to help you.
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