2024-06-13

The throttle cannot be slammed after the diesel engine is cold started.

Insufficient cooling water of diesel generators will reduce their cooling effect, and the diesel engine will overheat due to lack of effective cooling; excessive cooling water and oil temperature will also cause the diesel engine to overheat. At this time, the main thermal load of the diesel generator cylinder head, cylinder liner, piston assembly and valve is heavy, and its mechanical properties such as strength and toughness drop sharply, which increases the deformation of the parts, reduces the matching gap between the parts, and accelerates the wear of the parts., In severe cases, cracks and stuck parts may occur. The overheating of the diesel generator will also worsen the combustion process of the diesel engine, causing the injector to work abnormally, the atomization is poor, and the carbon deposit increases. After the diesel generator set is turned off, the circulation of the cooling system water stops, the heat dissipation capacity is sharply reduced, and the heated parts lose cooling, which is easy to cause the cylinder head, cylinder liner, cylinder block and other parts to overheat, produce cracks, or cause the piston to expand excessively and get stuck in the cylinder liner. Inside. On the other hand, when the diesel generator stops without idling cooling, the friction surface will contain insufficient oil, and when the diesel engine starts again, it will aggravate the wear due to poor lubrication. Therefore, the diesel generator should be unloaded before flameout, and gradually reduce the speed, no-load operation for a few minutes. If the throttle is slammed, the speed of the diesel generator will rise sharply, which will cause some friction surfaces on the aircraft to wear severely due to dry friction. In addition, when the throttle is hit, the piston, connecting rod and crankshaft receive large changes in force, causing severe impact and easy damage to the parts. When the diesel generator is cold-started, due to the high oil viscosity and poor fluidity, the oil pump is insufficiently supplied, and the friction surface of the machine is poorly lubricated due to lack of oil, causing rapid wear, and even failures such as cylinder pulling and tile burning. Therefore, the diesel engine should run at idle speed after cooling and start to heat up, and then run with load when the standby oil temperature reaches 40 ℃ or above; the machine should start with a low-speed gear and drive for a certain mileage in each gear in sequence until the oil temperature is normal and the fuel supply is sufficient After that, it can be converted to normal driving. The diesel engine runs when the oil is insufficient. At this time, the insufficient oil supply will cause insufficient oil supply on the surface of each friction pair, resulting in abnormal wear or burns. For this reason, before the start of the diesel generator and during the operation of the diesel engine, it is necessary to ensure sufficient oil to prevent cylinder pulling and tile burning due to lack of oil.