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Common Wrong Operation Methods of Diesel Generator Set Part 1

Aug. 02, 2021

Today we will introduce to you what are the common wrong operation methods of diesel generator sets. The following is the specific content. If you have any questions, please feel free to contact us.

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1. After a cold start, the engine will run under load without warming up

When the cold engine of a diesel generator set is 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 generator set should run at idling speed after cooling and start to heat up, and then run with load when the standby oil temperature reaches 40℃ or higher; the machine should start with low gear and drive for a certain mileage in each gear in sequence until the oil temperature is normal and the supply After the oil is full, it can be switched to normal driving.


2. Diesel generator set runs 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 generator set to prevent cylinder pulling and tile burning failures caused by lack of oil.


3. Sudden stop with load or stop immediately after sudden load removal

After the 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 liner. Inside. On the other hand, if the diesel generator set is shut down without cooling down at idle speed, the friction surface will not contain enough oil. When the diesel generator set starts again, it will aggravate the wear due to poor lubrication. Therefore, the diesel generator set should be unloaded before stalling, and the speed should be gradually reduced and run for a few minutes without load.


4. After the diesel generator set is cold start, the throttle is blasted

If the throttle is slammed, the speed of the diesel generator set will rise 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.


5. Run under the condition of insufficient cooling water or too high temperature of cooling water or engine oil

Insufficient cooling water for diesel generator sets will reduce its cooling effect. Diesel engines will overheat due to ineffective cooling. Excessive temperature of cooling water and engine oil will also cause diesel generator sets to overheat. At this time, the main thermal load of cylinder head, cylinder liner, piston assembly and valve, etc. will decrease sharply, and its mechanical properties such as strength and toughness will decrease sharply, which will increase the deformation of parts, reduce the matching gap between parts, and accelerate the wear of 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 the diesel generator set will also deteriorate the combustion process of the diesel engine, causing the injector to work abnormally, poor atomization, and increased carbon deposits.


6. Run under the condition that the cooling water and oil temperature are too low

During the operation of the diesel generator set, the temperature of the cooling water is too low, and the temperature of the cylinder wall drops accordingly. The water vapor produced by the combustion condenses into water droplets. It contacts the exhaust gas to generate acidic substances, which adhere to the cylinder wall and cause corrosion and wear. Practice has proved that when the diesel generator set is often used at the cooling water temperature of 40℃~50℃, the wear of its parts is several times larger than that of the normal operating temperature (85℃~95℃). At this time, when the water temperature is too low, the temperature in the cylinder is low, and the ignition delay period of the diesel generator set is prolonged. Once a fire occurs, the pressure rises rapidly, and the diesel generator set has crude fuel, which may cause mechanical damage to the parts. The diesel generator set has been running under the condition of low cooling water temperature for a long time, and the gap between the piston and the cylinder liner is large, knocking has occurred, and vibration has occurred, causing the cylinder liner to appear cavitation. The oil temperature is too low, the oil viscosity is high, the fluidity is poor, and the lubrication part is insufficient, which makes the lubrication worse, causes the friction pair wear to increase, and shortens the service life of the diesel generator set.


The above are the common wrong operation methods of diesel generator set, we will continue introduce it in next article.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, welcome send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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