(1) carefully check the parts after

(1) carefully check the parts after cleaning; Do not touch the sliding surface after cleaning; The pump body should also be carefully checked for damage and cracks. In the impact of the normal operation of the fuel injection pump to be replaced.(2) check the mating clearance of the plunger coupling: clean the plunger and the sleeve with diesel oil and insert the plunger into the sleeve. One hand holds the letter sleeve at a 60° tilt with the horizontal plane, and the other hand pulls the plunger out of the sleeve 1/3 of the full length. After releasing the hand, observe the plunger's sliding speed under the action of dead weight. Then turn the plunger at an Angle and pull out 1/3 of the full length to see how fast the plunger is sliding. If the sliding speed of the plunger is slow in both tests, it indicates that the plunger and the sleeve have good tightness and can be continued to use; If the plunger sliding too fast, indicating poor sealing, should be replaced with a new piece; If the plunger sliding speed is fast or slow, it indicates that the cylinder error of the plunger is too large, and it should be scrapped and updated; If the plunger slides at different speeds during the two tests, it indicates that the error between the plunger and the sleeve is too large, and it should also be scrapped and updated.(3) maintenance of oil outlet valve. If the valve spring is broken, it should be replaced. If the oil valve seal is not strict, the solution can be used to grind: oil coated in the oil valve seal surface, two hands respectively hold the oil valve and valve seat mutually grind, and relative rotation, in order to keep the grinding uniform. If the oil valve seal surface wear serious, can be in the sealing surface coated with a little fine grinding sand, grinding each other, can eliminate the friction marks on the sealing surface; After grinding, clean the grinding sand with gasoline, and then use the oil for polishing, to ensure the smooth sealing surface discounted. If the pressure relief ring of the oil valve wear too much, the surface of the black without luster and stretch marks, should replace the oil valve coupling. Check the sealing ring of the oil valve, such as the high pressure sealing ring between the ring body and the compression seat and the low pressure sealing ring of the compression seat, if there is any damage, should be scrapped and updated.