Comrades who have used diesel engines generally know that the fuel injectors are one of the three pairs of precision couplings for diesel fuel supply systems. Its normal service life is more than 1000 hours. However, due to improper use, it often takes hundreds of hours, or even tens of hours, to wear out and die. First, the injector stuck main reasons: 1 diesel oil is not clean, high-pressure fuel pipe impurities, speed up the injector needle valve and even wear, so that the needle valve is not closed, high-pressure gas in the combustion chamber, Burn needle assembly. In addition, the dirt on the parts of the fuel injector regulator spring, the tappet, etc. is moved to the upper part of the injector needle valve through the injector tappet, or the cotton rope and the lead wire used for preventing oil leakage on the oil pathway enter the injector through the high pressure fuel pipe. The oiler will make the needle valve stuck. 2 Machine temperature too high The injector has poor cooling, causing the ground valve to be stuck. The oil supply time is too late, the scale of the cooling water channel is too much or blocked, the end face of the pump impeller is worn, and the long-term overload of the engine causes the engine to overheat. 3 When the oil valve wears out, the oil dripping phenomenon occurs when the fuel injector stops spraying, so that the fuel nozzle burns char, and a stuck failure occurs. 4 The fuel injection pressure is too low, causing high-pressure gas backflow in the combustion chamber. 5 When the injector is installed, the missing gasket or gasket is destroyed, causing air leakage, causing the local temperature of the injector to be too high and stuck. 6 The reasons for the manufacturing of parts, such as the cylinder head on the injector mounting hole and the injector too tight, the needle valve body and cylinder head mounting hole clearance is too small, the cylinder head injector mounting hole processing too deep. Second, the nozzle stuck repair method: the first stuck injector into the diesel or oil heating, and then remove the cloth wrapped, and then pinch the needle valve and slowly move, the needle The valve is removed from the needle valve body. A small amount of clean oil is dripped in the needle valve body, so that the needle valve moves repeatedly in the needle valve body until the needle valve can move freely in the needle valve body. If the sealing surface of the needle valve has burn marks, it should be ground with a grinding paste. Grinding should pay attention to the amount of grinding paste and grinding time. Install the cleaned needle valve coupler on the injector and adjust the injection pressure to reuse it.
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