Oil Circuit Conditions For Normal Working Of Yuchai Diesel Generator Set

Yuchai diesel generator set adopts the world's most advanced electronically controlled unit pump fuel injection system, including low-pressure and high-pressure fuel systems. When the Yuchai diesel generator set is working normally, there should be no air in the pipeline of the oil supply system. Otherwise, the engine will be difficult to start or easily stall.

This is because air is very compressible and elastic. When there is a leakage point in the oil pipe from the fuel tank to the diesel engine fuel pump, air will infiltrate, thereby reducing the vacuum in this pipeline, weakening the suction of the fuel in the fuel tank, or even interrupting the flow, resulting in the engine not being able to start. In the case of less air mixed in, the oil flow can still be maintained and sent to the fuel injection pump by the oil transfer pump, but the engine may be difficult to start, or it may turn off by itself shortly after starting.

When the amount of air mixed in the oil circuit is slightly more, it will cause the fuel cut off of several cylinders or the fuel injection amount to be significantly reduced, making the diesel engine unable to start at all.

How to find leaks in pipelines and plug them?

The fuel supply system of Yuchai diesel generator set is divided into low pressure oil circuit and high pressure oil circuit. The low-pressure oil circuit refers to a section of the oil circuit from the fuel tank to the low-pressure oil chamber of the fuel injection pump, and the high-pressure oil circuit refers to a section of the oil circuit from the plunger chamber in the high-pressure pump to the fuel injection nozzle. In the supply system of the plunger pump, there will be no air infiltration in the high-pressure oil circuit, and there will be leakage points, which will only lead to the leakage of fuel. Find a way to block the leakage points.

Yuchai diesel generator sets mostly use soft rubber hoses in the low-pressure oil circuit of the fuel supply system, and the hoses are prone to friction with the parts, resulting in oil leakage and air intake. It is easier to find oil leaks, but it is not easy to find a damaged intake air somewhere in the pipeline. The following is the method for judging the leakage point of the low pressure oil circuit.

1. Drain the air in the oil circuit, and after starting the engine, find the place where the diesel leaks, which is the leak point.

2. Loosen the bleed screw of the engine fuel injection pump and pump the oil with a manual oil pump. If it is found that the bleed screw is in the oil flow that starts to discharge a large number of air bubbles, and after repeated hand pumping, the air bubbles still do not disappear. There is a leak in the negative pressure oil circuit of the oil delivery pump section. This section of pipeline should be removed, and then lead to the pressurized gas, and put it in the water, and find the place where the air bubbles, that is, the leak point.

3. The oil supply system will also cause the Yuchai diesel generator set to fail to start normally. For example, there is air in the fuel system, which is a common fault. It is usually caused by improper handling when replacing the fuel filter element (for example, no exhaust work is performed after replacing the fuel filter element). After the air enters the pipeline with the fuel, the fuel content in the pipeline is reduced, the pressure is reduced, and the high-pressure fuel injection atomization of the fuel injector opening the nozzle to more than 10297Kpa causes the engine to fail to start. At this time, exhaust treatment is required, and it can be done when the inlet pressure of the fuel transfer pump reaches 345Kpa or more.

In addition, the blockage of the fuel pipeline, such as the blockage of the fuel injection nozzle, will also make the Yuchai diesel generator set unable to start.

It is also common for the Yuchai diesel generator set to fail to start due to the failure of the air system of the Yuchai diesel generator set. This situation is generally due to the negligent management of the staff, the infrequent maintenance of the generator, the long-term non-cleaning of the air filter, and too much dust and other debris, resulting in the inability of air to be supplied to the diesel engine normally and the generator set unable to start normally. At this time, the air filter needs to be cleaned or replaced, and the fault can be eliminated.

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