This article mainly introduces how to solve the problem of black smoke from the Doosan excavator X120 engine.
2023.07 Doosan DMS-5 Data Monitoring System Diagnostic Software
Fault description
1. The engine has obvious black smoke when under heavy load. 2. There
are no alarms or fault codes on the instrument panel
Failure cause analysis
1. Check whether the air filter element, oil-water separator, and fuel
fine filter have exceeded the maintenance period or are dirty and need to be maintained in
advance.
2. Since there is no fault code, it is basically judged to be a mechanical failure, and
the cylinder cutoff test is carried out by cutting off the oil (a special high-pressure common
rail plug is required)
3. When the fuel injector of the 2nd cylinder is cut off, the black
smoke is significantly reduced, so it can be judged that the 2nd cylinder injector is faulty.
4. After replacing the 2-cylinder injector, the equipment operates normally.
in conclusion
1. Due to the abnormal wear of the 2-cylinder injector, the fuel injection volume becomes
larger, the atomization is poor, the combustion is insufficient, and the engine emits black smoke.
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