Injectors atomize the fuel that is delivered to them from the injector pump directly into the combustion chamber. The injector nozzle and nozzle holder contain check valves and springs that deliver a controlled burst of high pressure fuel.
The valves in the injector prevent fuel from injecting before the full injection pressure is achieved by the injector pump. They also prevent fuel from dripping into the combustion chamber after the pressure falls below full injection pressure. Debris from dirty fuel and carbon deposits on the nozzle tip prevent the plunger injector from properly controlling the fuel and can distort the nozzle spray pattern, resulting in poor engine performance and fuel economy. And that is why there is the need to clean the injector.
When you clean your injector, you first remove the high pressure fuel pipe and the fuel return pipe fittings from the injector with a wrench. And remove the fuel injector retainer nut and retainer as well.
Second, you pull the injector out of the injector hole. Clamp a nozzle holder in a bench vise. Insert the nozzle into the holder. And then remove the nozzle nut with a 15-mm box spanner and pull the nozzle off of the injector body. While you are doing this, be careful to not lose any of the small internal parts inside the injector.
Clean any carbon on the nozzle body with a brass brush and any carbon from the injector tip by rubbing it on a piece of wood. Wash the nozzle in fresh DLLA138S1191 diesel fuel. Clean the nozzle injector seat. Spray the nozzle with cleaning spray to remove any debris or loose carbon. And clean the nozzle hole with a nozzle cleaning needle. Insert the needle into the nozzle hole and run it in and out to break loose any carbon deposits and polish the hole. Finally, rinse with cleaning spray.