The owner is most worried about the black smoke fault of the engine, because this fault not only causes great damage to the engine itself, but also takes a lot of time and effort to repair. In fact, on the one hand, it is difficult to repair the black smoke fault. On the other hand, it needs to be carefully repaired in strict accordance with the fault conditions to ensure a thorough repair. Today, we will take a look at how to solve the black smoke fault.
First
Check the air filter for dust or blockage. After the engine is parked, the throttle is adjusted to the maximum. At this time, check whether each air inlet pipe has sound or the air inlet rubber pipe has deformation. The Cat excavator intercooler should also be checked, which is also an easily overlooked part. If there are foreign matters in the intercooler or the surface is too dirty, it will cause poor air intake or high air intake temperature, which will also cause black smoke from the engine.
Second
Check the turbocharger intake pipe to see if there is any oil leakage, observe whether the turbine impeller and blades are broken, worn and deformed, whether there is any scratch or bore damage in the turbocharger housing, and finally check whether the impeller shaft clearance is too large.
Related reading: Common fault collection of excavator turbocharger
Third?
Check whether the diesel filter element, diesel pipeline and diesel tank are too dirty. Using substandard fuel for a long time will cause failure to the entire fuel system, including the diesel pump and injector.
Fourth?
The excavator is weak when emitting black smoke, and the sound changes when the engine is loaded. At this time, it is likely that the main pump power exceeds the engine power, causing black smoke. At this time, it is necessary to reduce the flow pressure of the main pump. If the fault still exists after being adjusted to the normal value, the engine fuel system must be checked.
Fifth?
When the excavator suddenly works at idle speed, the engine speed will suddenly rise to the maximum speed from idle speed. As the fuel supply of the engine suddenly increases, the lag of the turbocharger speed and the throttling of the supercharging intake system pipe cause insufficient air intake, the engine will emit black smoke immediately due to insufficient fuel combustion
In a word, it is troublesome to deal with the black smoke fault of the engine, but it does not mean that there is no way out. Carefully observe the black smoke phenomenon and find out the essential cause of the fault, so the black smoke fault of the engine can be easily solved!
