Fault reasons and countermeasures of high pressure oil pipe

Fault reasons and countermeasures of high-pressure oil pipe:

I. why is the high-pressure oil pipe of diesel generator set often broken?

1. The fracture of high-pressure oil pipe is related to the quality of high-pressure oil pipe and the assembly mode when installing high-pressure oil pipe. When assembling the high-pressure pipe, it should be noted that if the Angle difference is large, the pressure concentration will be caused at the joint of the oil pipe, resulting in the fracture of the oil pipe at the joint. At this time only need to disassemble the injector for inspection, and then replace an oil valve to solve the problem.

2. The fracture of the high-pressure oil pipe is related to the poor unloading of the oil outlet valve. The sealing or unloading of the oil outlet valve is not good, and the residual pressure of the high pressure oil pipe causes the high pressure of the oil pipe after a long time accumulation, which causes fatigue damage or crack of the high pressure oil pipe.

3. When the engine is running, if the fuel nozzle is stuck and the plunger continues to spray oil upward, the pressure on the high-pressure oil pipe is limited. If the high-pressure oil pipe is subjected to this pressure for a long time, the high-pressure oil pipe will burst. Therefore, once the high-pressure oil pipe of diesel engine ruptures, it is necessary to check whether the injector is stuck.

4. The fracture of high-pressure oil pipe is also closely related to the vibration of diesel engine. The two ends of the high-pressure oil pipe are fixed by nuts, and the middle is only supported by the oil pipe clip with a sheet fulcrum. The common vibration of the oil pipe will cause the oil pipe to fracture due to the vibration of the diesel engine. It is useless to replace the high-pressure oil pipe like this.

5. Some automobile repair workers often find that the high pressure oil pipe of diesel engine ruptures due to the improper installation position between the two ends of the high pressure oil pipe, the fuel injector joint and the oil injection pump's tight seat. After tightening the nuts at both ends of the high pressure oil pipe, the high pressure oil pipe is distorted and deformed.

Ii. Why does the high-pressure oil pipe of diesel engine not produce oil?

It is possible that the oil supply rack of the plunger of the high-pressure oil pump is stuck in the position of stop oil (flame out), and the inspection window on the side of the oil pump can be opened for inspection. No oil, go to the oil pump, estimated dead plug. If the oil is not clean, should promptly clean up the diesel filter.

Why is the high-pressure oil pipe hot when the diesel engine works?

Because the temperature is too high. The advantages of diesel engine are large power and good economic performance. Diesel engine work process and gasoline engine have many of the same place, each work cycle also experienced intake, compression, work, exhaust four stroke. But because the fuel used in diesel engine is diesel, its viscosity is larger than gasoline, not easy to evaporate, and its spontaneous combustion temperature is lower than gasoline, so the formation of combustible mixture and ignition mode are different from gasoline engine. The main difference is that the mixture in the cylinder of a diesel engine is pressurized, not ignited. Diesel engine air into the cylinder is at work, at the end of the compressed air in cylinder, the temperature can reach 500-700 ℃, pressure can be up to 40-50 atmospheric pressure. Check point near the end of the piston, the engine of the high pressure pump with high pressure in the cylinder injection diesel, diesel form of subtle oil grains, mixed with high pressure high temperature air, diesel mixture combustion, violent expansion, produce explosive force, driving the piston downward to do work, the temperature can reach 1900-2000 ℃, pressure can reach 60-100 atmospheric pressure, the power is very big, so the diesel engines are widely used in large diesel cars.