Diesel generators in the course of the piston burning is a common fault, which led to the burning of diesel generators piston main reasons: 1. The drop of oil or fuel injector atomization bad, diesel generator fuel for a long time within the combustion piston crown again, causing the piston top temperature, so that the piston burning. 2. diesel generator badly worn or broken piston oil channeling, causing piston burning. 3. Select a low-quality lubricants and accelerated wear of the cylinder diesel engine crankcase exhaust gas pressure increases, the combustion chamber coke increased, causing the piston burning. The diesel engine cylinder oil quantity and injection timing uneven, so that part of the deterioration of the cylinder combustion process, the formation of coke, diesel calories burned part of the piston inside the cylinder top temperature is too high, leading to thermal fatigue diesel pillow melting, cause the piston burning. 5. The piston cylinder liner quality problems, if the presence of diesel piston holes, loose, micro-cracks, defects such as slag during casting, at high temperature and pressure, these defects will become a source of fatigue and lead to fatigue failure of the piston; piston The slag is first melted, causing the piston pillow melting. 6. Improper piston top clearance, when assembled engine, piston top clearance if adjusted properly, it will affect the diesel engine compression ratio, resulting in live or Sierra cylinder piston burning, which requires the diesel engine in the assembly in strict accordance with the requirements of adjustment