Fault of Short Working Time and Self-extinguishes of Diesel Generator After Starting

Aug. 25, 2021

If the diesel generator set maintains shortly after starting, and then self-extinguishes, it can be judged that it is caused by the mixing of air in the oil circuit. The air in the oil circuit will bring a lot of obstacles to the operation, so it is difficult to start the generator set or the abnormal situation of uninterrupted flameout occurs. However, the difficult start-up failure of the diesel generator set, which is maintained shortly after starting, and self-extinguishes, is largely caused by the mixing of air in the oil circuit.


The root cause of the mixing of air into the oil circuit of the diesel generator is that at least one of the injector needle valve assembly of the diesel generator has the phenomenon of wear and tear, which causes the combustion gas to pass through the injector and enter the oil return system. Resulting in a large amount of gas in the oil return system. When this kind of phenomenon occurs, if the fuel return from the fuel injector is directly returned to the fuel tank, the direct impact on the operation of the diesel generator set is relatively small. However, if the fuel return of the fuel injector is connected to the fuel filter, it will have a serious impact on the operation of diesel generators. Therefore, after this phenomenon occurs, Dingbo Power reminds you: first, all injectors must be inspected and repaired or replaced with needle valve parts.


1800KW Perkins generator with Marathon alternator


1. Conventional method

Use a screwdriver or a wrench to unscrew any bleed screw on both sides of the fuel injection pump for a few turns, and press the manual fuel pump by hand until the diesel is discharged without air bubbles and a "squeaking" sound is made. Then tighten the bleed screw to press the manual oil pump back to its original position, as shown in Figure 1-1. The exhaust method of the unit pump oil circuit system is shown in the figure.


2. In an emergency situation, unconventional methods can be adopted.

1) If you have not opened the appropriate screwdriver or wrench of the bleed screw on the fuel injection pump, you can first unscrew the manual fuel pump, then loosen any pipe joint from the diesel filter to the fuel injection pump, and then repeatedly press the manual fuel pump Until the joint discharges a smooth and bubble-free oil flow. Then tighten the joint while pressing the manual oil pump, and finally press the manual oil pump back to the original position.


2) When there is no wrench to loosen the pipe joints, you can repeatedly press the manual fuel pump until the low pressure oil pressure between the fuel delivery pump and the fuel injection pump section is high enough, and the fuel will flow from the overflow valve into the fuel return line. The gas in the oil circuit will be discharged from the overflow.


3) If you need to discharge the air in the oil circuit, you can first loosen the bleed screw on the fuel injection pump or loosen any joint between the diesel filter and the fuel injection pump, and then start and drive the mechanical fuel pump. Fuel without bubbles will be sprayed out. At this time, tighten and loosen the leak points above to exhaust the air.


With the continuous improvement of diesel engine performance, the components of the related oil circuit system have become more and more sophisticated, but the machinery will inevitably fail. If air is mixed into the oil circuit of the diesel generator set, the air will affect the operation of the diesel generator set, so regular inspection and maintenance are necessary. The air in the oil circuit should be found in time and removed in time.


Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. was established in 2006. It is a Chinese diesel generator manufacturer integrating design, supply, commissioning and maintenance of diesel generator sets. From product design, supply, debugging and maintenance, we provide you with all-round pure spare parts, technical consultation, installation guidance, unit transformation and personnel training for diesel generator sets, and provide five-star worry-free after-sales service. Contact usdirectly to get more technical datasheet.

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