Do you know what are the wrong operations of Cummins diesel generator set? For example, after a cold start, the engine is operated under load without warming up. When the Cummins diesel generator starts in a cold engine, due to the high oil viscosity and poor fluidity, the oil pump is insufficiently supplied, and the friction surface of the machine is lack of oil and poor lubrication, causing rapid wear and even Failures such as cylinder pulling, tile burning, etc. have occurred. Therefore, the Cummins diesel generator set should run at idling speed after cooling and start, and run with load when the standby oil temperature reaches 40°C or higher; the machine should start with low gear and drive for a certain mileage in each gear sequentially until the oil temperature is normal. After the fuel supply is sufficient, it can be switched to normal driving.
Cummins diesel generator sets run when the oil is insufficient. At this time, insufficient oil supply will cause insufficient oil supply on the surface of each friction pair, resulting in abnormal wear or burns. For this reason, it is necessary to ensure sufficient oil before the machine starts and during the operation of the diesel engine to prevent cylinder pulling and tile burning failures caused by oil shortage. After the Cummins diesel generator set is turned off, the cooling system water circulation stops, the heat dissipation capacity is drastically reduced, and the heated parts lose cooling, which can easily cause the cylinder head, cylinder liner, cylinder block and other parts to overheat, produce cracks, or cause the piston to over-expand and become stuck in the cylinder. In the set.
On the other hand, when the Cummins diesel generator set is shut down without cooling down at idle speed, the friction surface will not contain enough oil. When the diesel engine starts again, it will aggravate wear due to poor lubrication. Therefore, before the diesel engine stalls, the load should be removed, and the speed should be gradually reduced and run for a few minutes without load. The Cummins diesel generator set blasts the throttle after cold start. If the throttle is blasted, the speed of the Cummins diesel generator increases sharply, which will cause some friction surfaces on the machine to be severely worn due to dry friction.
In addition, the piston, connecting rod, and crankshaft receive large changes when the throttle is hit, causing severe impacts and easily damaging parts. When the cooling water is insufficient or the cooling water and oil temperature are too high, the Cummins diesel generator set will reduce its cooling effect if the cooling water is insufficient, and the diesel engine will overheat due to ineffective cooling; the oil temperature of the cooling water and oil is too high , It will also cause the Cummins diesel generator set to overheat.
At this time, the main heat load of cylinder head, cylinder liner, piston assembly and valve is large, and their 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. There will also be cracks and malfunctions such as machine parts jamming. Excessive temperature of cooling water and engine oil will accelerate engine oil aging and deterioration, and reduce engine oil viscosity. The conditional lubrication conditions of cylinders, pistons and main friction pairs will deteriorate, resulting in abnormal wear. Overheating of Cummins diesel generator sets will worsen the combustion process of the diesel engine, causing the injector to malfunction, poor atomization, and increasing carbon deposits.
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