High-pressure oil pipe failure causes and countermeasures？

1. High-pressure oil pipe breakage is related to the quality of high-pressure oil pipe and the assembly method when installing high-pressure oil pipe. In the assembly of a high-pressure pipe needs to pay attention to it, if the angle does not match the difference is large, in the oil pipe connection will to pressure concentration, resulting in joints at the oil pipe fracture. At this time, just disassemble the injector for inspection, and then change an oil valve to solve the problem.

2. High-pressure fuel line breakage and the outlet valve unloading bad have a certain connection. Outlet valve sealing or unloading is not good, and high-pressure oil pipe residual pressure after a long time of accumulation of high-pressure oil pipe formation, results in high-pressure oil pipe fatigue damage or cracks.

3. The engine is in operation, such as the injector nozzle jammed, the plunger continues to spray oil up, the high-pressure oil pipe pressure is limited, it long time to withstand this pressure, and the high-pressure oil pipe will rupture. Therefore, once the diesel engine's high-pressure fuel line breaks, need to check whether the injector jammed.

4. High-pressure fuel line breakage also has a great relationship with diesel engine vibration. High-pressure fuel pipe is fixed at both ends by the nut, and the middle only by the fuel pipe clamps a tin pivot support, diesel engine vibration caused by the fuel pipe shock caused by the fuel pipe fracture, such as the replacement of high-pressure fuel pipe is not useful to solve the vibration of the diesel engine can be replaced.

5. Some automobile repair masters often find diesel engine high-pressure fuel pipe fracture, lies in the two ends of the high-pressure fuel pipe, and the injector connector and injection pump outlet valve tight seat installation position is not correct, tighten the nut at both ends of the high-pressure fuel pipe, high-pressure fuel pipe twisted deformation, diesel engine startup, high-pressure fuel pipe due to the vibration of the fracture.

Second, why the diesel engine's high-pressure fuel pipe is not out of oil? 

The high-pressure oil pump plunger oil supply rack may stick in the oil (flameout) position, you can open the side of the oil pump inspection window to check. Does not come out of the oil, go to school under the oil pump, I guess the injection plug is stuck. If the oil is not clean, you should clean the diesel filter element in time.

Third, why is the diesel engine work high-pressure fuel pipe hot?

Because the temperature is too high. The advantages of diesel engines are high power and good economic performance. The working process of diesel engines and gasoline engines has a lot of the same place, each work cycle also experiences intake, compression, work, and exhaust four strokes. However, because the fuel used in diesel engines is diesel, its viscosity is greater than gasoline, not easy to evaporate, and its auto-ignition temperature is lower than gasoline, so the formation of combustible mixtures and ignition methods are different from gasoline engines. The main difference is that the mixture in the cylinder of a diesel engine is compression ignition, not ignition. In the diesel engine, the cylinder is air, air compression in the cylinder to the end of the temperature up to 500-700 ℃, and the pressure up to 40-50 atmospheric pressure. Piston close to the upper stop, the engine on the high-pressure pump to high-pressure diesel injection into the cylinder, diesel oil forms fine oil particles, and high pressure and high temperature air mixture, diesel fuel mixture combustion, violent expansion, resulting in explosive force, pushing the piston down to do work, at this time, the temperature can reach 1900-2000 ℃, the pressure can be up to 60-100 atmospheres, resulting in a large amount of power, so diesel engines are widely used in large diesel vehicles. Therefore, the diesel engine is widely used in large diesel automobiles. Diesel engines have energy saving and carbon dioxide emission advantages, including gasoline engines, including all thermal engines can not be replaced, therefore, advanced small high-speed diesel engines, emissions have reached the European III standards, become a "green engine", have become the European and American many of the new car's power plant.

Why does the diesel engine smoke when accelerating after replacing the high-pressure fuel line?

This is a normal phenomenon. When the car accelerates, the gas pedal increases, and the amount of oil in the increase in diesel fuel combustion is not sufficient, there will be black smoke, and black smoke is not fully combusted diesel fuel inside the carbon.