How to perform regular maintenance on the injector

by:Join Machinery     2021-04-22
The tooth root manufacturer introduced that the needle valve assembly of the injector needle valve during long-term work, due to the combined effects of high-pressure oil washing, grinding of mechanical impurities, and seating of the pressure spring, will cause the mating surface of the needle valve and the valve body to be worn. , Causing leakage before fuel injection and dripping after fuel cut, resulting in poor atomization, incomplete combustion, sharp increase in soot, and serious coke deposition. Therefore, regular maintenance of the injector must be carried out. (1) When disassembling, remember the cylinder sequence of each injector. Remove the injector from the cylinder head, perform a simple external cleaning, and then disassemble, inspect, and assemble one by one to prevent the same parts of different injectors from being damaged. Mix with each other during assembly. The specific steps are: first clamp the nozzle hole of the fuel injector downward on a vise, remove the pressure regulating screw cap, pressure regulating screw and spring to clean. Then fix the injector on the vise, loosen the fastening screw sleeve of the coupler, remove the coupler of the injector, and perform the following inspection after necessary cleaning.  (2) The inspection is divided into visual inspection and sliding test.   Visually check that the mating surface of the needle valve and the valve body must not be burnt or corroded; the shaft needle of the dedendum needle valve must not be deformed or damaged. In the sliding test, the valve body must be tilted about 60 degrees, and the needle valve must be released after about 1/3 of its stroke. The needle valve should be able to slide down smoothly by its own weight; rotate the needle valve position and repeat the above operation, If the needle valve does not slide smoothly in any position, the needle valve assembly should be replaced.
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