1. The air intake is insufficient or the air intake pipe is blocked. In order to find out the cause, the following checks should be carried out: whether the air filter is blocked; Check whether the intake pipe leaks; Whether the turbocharger is damaged.
2. Improper adjustment of valve clearance Poor contact of valve sealing ring belt. Check the valve clearance, valve spring and valve sealing ring belt.
3. The fuel injection is too late, so the fuel injection advance angle should be adjusted.
4. The fuel injector should be removed for maintenance in case of poor operation or damage.
5. The cylinder liner and piston ring components are seriously worn. In this case, the piston ring seal is not tight, the air pressure in the cylinder drops, resulting in the diesel engine not fully burning and emitting black smoke, and the engine power drops sharply. In severe cases, the engine will automatically shut down under load. Wear parts should be replaced.
6. The supply of each cylinder of high-pressure oil pump is uneven or too large. If the rotating speed is unstable and black smoke is emitted intermittently, it should be adjusted to make it balanced or within the specified range.
In many cases, in order to catch up with the project and meet the problem of failure, most operators or bosses will choose not to deal with the problem for the time being, and then finish the project work in hand. In fact, this practice will virtually aggravate the degree of failure. When encountering problems such as black smoke from excavators, there are many precision parts that need to be inspected and disassembled. We should directly find professional excavator repair personnel for maintenance to ensure the normal and stable operation of excavators.
