(1) The fuel pump wear led to diesel oil into the oil This failure is manifested as: the oil surface was significantly increased, and accompanied by diesel smell, serious oil from the plus port or vents out of oil. With the piston pump, diesel into the oil, there are only two ways: diesel can be directly from the pump roller body backlash into the fuel pump room under the oil; pump sub-pump plunger wear excessive, resulting in points Pump leakage (serious will affect the normal start of the engine), the internal leakage of diesel oil will flow into the next room. The solution is: Open the fuel pump side cover, start the engine, if the sub-pump plunger out of diesel, indicating that the sub-plunger piston wear excessive, you need to change the plunger coupling and test bench should be verified Fuel injection pump. Remove the fuel pump (do not split a connecting tubing) Pump pump oil by hand, if the pump pump backlash Diesel emerge, prove that the pump is faulty. You can also remove the pump a few connection tubing, tighten the hand pump, block the pump outlet, from its inlet into the pressure of 0.4MPa gas, if the roller backlash gas emerge, then prove the pump Faulty, should be replaced. (2) injection white pump outlet high-pressure hose connector Department of the leakage of oil The reason is that the injection pump concave outlet and round convex high-pressure pipe fittings due to wear and tear caused by the lack of strict sealing and leakage. The solution is that in the injection pump outlet concave joint pads in the school have a pump factory, and can be free with the school pump, fuel injector and high pressure tubing connection Department of oil leakage can also use this method, the practice proved very effective it is good. (3) injection pump shaft break If the fuel injection pump 4 fine bolts are not tight, when the engine is working, the loose pump and the pump seat dry, and then the gap, the longer the gap, the greater will eventually lead to the fuel pump Displacement occurs at the installation site, and the injection pump and drive shaft are not in the same position to break the shaft. The solution is, with appropriate thickness of copper for the pad, pad between the pump and the pump seat, eliminating the gap. When installing the injection pump, clean the threaded holes first, and then tighten the four fixing bolts to the specified torque, and check the concentricity of the injection pump shaft and the transmission shaft. If they do not meet the standards, they should be readjusted. It is recommended to disassemble the pump together with the pump seat.