Put the stuck nozzle first into diesel or engine oil to warm it, then take it out and wrap it with cloth, and then clamp the needle valve with hand-clamp and move it slowly to remove the needle valve 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. Put the cleaned clock valve coupler on the injector, and adjust the injection pressure to use it again.
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