When the injector is in operation, the seal cone of the needle valve body will be frequently impacted by the strong force of the needle valve. Coupled with the constant injection of high pressure oil flow from the point, the cone will gradually appear nicks or spots, thereby losing the seal and causing the injector to drop oil. When the temperature of the diesel engine is low, the exhaust pipe gives off white smoke, and when the temperature of the engine rises, it turns into black smoke, and the exhaust pipe gives out irregular sound of shooting. If the oil supply to the cylinder is stopped at this time, the smoke exhaust and the sound of firing guns will disappear.

Solution: The injector can be disassembled, the needle valve head with a little chromium oxide fine grinding paste (note not to stick in the needle valve hole) to grind the cone surface, and then clean with diesel oil, into the injector test. If still unqualified, the needle valve should be replaced.

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