New Injector C4359204 for Cummins Excavator Engine Qsl9.3

Why not wipe off the carbon deposits and oil stains on the injector when disassembling the injector?
Answer: When the vehicle diesel engine works well, the fuel injector looks clean, but there is a little even and dry thin layer of carbon powder attached to the fuel injector. When the fuel injection pump, fuel injector or other parts of the engine are not working well, then It may cause accumulation or oil stain changes at the injector nozzle of the injector. Referring to the carbon deposits or oil stains at the fuel injectors, it is helpful to judge the working conditions of certain parts of the engine. For example, when there is a lot of carbon deposits at the fuel injectors, and sticky wet engine oil is attached, it means that the matching gap between the piston and the cylinder liner is too large, and the organic oil flows into the combustion chamber: there are more carbon deposits at the fuel injectors, and There is wet diesel oil attached. The reason may be that the valve is not closed tightly, the fuel injection time is too late, the fuel injection needle valve is stuck in the position where it cannot be closed, and the oil leakage is serious. There are many carbon deposits at the fuel injector. If the carbon deposit is concentrated at the fuel injector, it may be due to poor performance of the fuel injector; if the carbon deposit is widely distributed, it may be due to poor valve sealing, premature fuel injection time, and poor atomization of the fuel injector.