Put the blocked fuel injection nozzle into diesel or engine oil for heating, then take it out and wrap it with cloth, then clamp the needle valve with pliers and move it slowly, and take the needle valve out of the needle valve body. Drop a small amount of clean oil into the needle valve body to make the needle valve repeatedly move 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 grinding paste. When grinding, pay attention to the amount of grinding paste and grinding time. Install the cleaned bell valve coupling onto the fuel injector and adjust the injection pressure before reuse.
