Causes of diesel generator piston failure.

    The ablation of the piston top cover of most diesel generators occurs in the upper end of the piston and the first and second piston ring grooves. Completely ablated.
The main reasons for piston burnout are as follows:
1. There is serious carbon deposition on the upper end of the piston.
    Carbon deposits on the piston crown cause a part of the upper end of the piston to overheat. When a part of the high-temperature weather is higher than the melting point of the raw material, the upper end of the piston will melt to form a molten hole.
2. Piston ring glue will stick or crack.
    Bonding or cracking of the piston ring will prevent the piston ring from being in close contact with the cylinder wall, and the heat energy of the piston crown cannot be discharged in time, resulting in ablation of the piston crown and the ring groove.
3. Uneven supply of oil.
    The fuel supply of each cylinder of the internal combustion engine is inconsistent with the fuel supply time. The combustion process of some cylinders deteriorates, resulting in carbon deposits and severe afterburning. The thermal energy of diesel combustion cannot work. The temperature of the piston top of some cylinders is too high, and the raw materials are thermally fatigued and melted.
4. The nozzle does not work properly.
    When there is too much oil on the upper end of the piston, part of the temperature is too high, and the thermal stress increases, resulting in burnout.
5. The nozzle does not work properly.
    When the diesel generator is working, the piston top should withstand the periodic mechanical impact of the combustion and explosive force, and the instantaneous impact force can reach more than 10.0 MPa. If the diesel generator is not running well, its impact will increase. The thermal fatigue on the top of the piston and the action of the normal combustion explosive force make the upper end of the piston suffer from thermal fatigue and mechanical fatigue, and eventually melt.
6. The oil cooling nozzle is blocked.
    Some diesel generator bodies have oil cooling nozzles that spray oil into the piston cavity to help cool and dissipate heat. If the oil cooling nozzle is blocked, it is easy to cause the piston to burn to the top.
7. The diesel generator is overloaded and overspeeding for a long time, or the diesel generator has poor heat dissipation.
    Long-term exposure to excessive thermal and mechanical stress may lead to fatigue ablation.
8. The piston fails.
    Under high temperature and high pressure, if the piston has defects such as pores, sloshing, micro-cracks, and slag inclusions, some pores, sloshing, and micro-cracks will become sources of fatigue, resulting in fatigue damage; the slag inclusions of the piston will melt first, causing the upper end of the piston to melt.
9. Often step on the accelerator pedal.
    Diesel generators run at high speed and heavy load, and the temperature is too high, resulting in extremely hot ablation of the upper end of the piston.
10. When the air leakage in the air compressor and other factors cause the lower exhaust to be too much.
     A large amount of oil enters the suction pipe of the diesel generator through the exhaust pipe of the crankcase breather and enters the combustion chamber to participate in the combustion, and the upper part of the piston is burned.
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Prevention of failure:

1. Strengthen the maintenance of diesel generators;

2. Avoid overheating and carbon deposition of diesel generators;

3. Correct use to avoid long-term overload of diesel generators;

4. In the process of diesel engine maintenance, strictly follow technical requirements and pay special attention to The quality of fuel injectors, air compressors, and other components to avoid piston ablation.