When the diesel generator sets are based on multiple body pressure seal forms, such as cylinder liners, between piston, piston ring, turbocharger, turbocharger rotor shaft between such seals are generally about 1/3 of the engine load, only give full play to the role, run the following faults occur if the generator head of time under low load: 1. Blue Smoke Pistons, cylinder liners sealed well, oil channeling into the combustion chamber and exhaust take the blue smoke. 2. Oil Scurry For supercharged diesel engine, due to the low load, no-load, the boost pressure is low. Easily lead to turbocharger seal sealing effect is reduced, oil fleeing into the plenum chamber, along with the intake into the cylinders. 3. Coke Sneaked into the oil portion of the cylinder participate in the combustion, part of the oil can not completely burned in the valves, the inlet, the piston crown, piston rings, etc. to form coke, and part of it on the exhaust side. Thus, the cylinder liner discharge path will gradually accumulate oil, also the formation of coke. 4. Leakage The intensification indoor oil accumulate to a certain extent, it will leak from the turbocharger junction surface. 5. Wear Parts Long-term low-load operation, will lead to more serious wear and tear of moving parts, engine combustion environmental degradation as a result of the overhaul of the consequences in advance.