Diesel Injector Fuel Injector 0445120070 Bosch for Cummins Komatsu Cat Hitachi Engine 39766314930485 5263304

Injector Information

The solenoid valve at the top of the injector, the function of the solenoid valve is to control the injection of fuel. Let the fuel be injected into the cylinder at the correct flow rate at the correct time. This part is the valve assembly inside the injector, which is one of the most wear-prone parts inside the injector and consists of the bonnet and valve stem.

The dimple on the bonnet is also one of the parts that are prone to wear. There will be a steel ball in the pit, through which the solenoid valve controls fuel injection. After the interior of the pit wears out, the oil return volume of the injector will increase due to the lax closure of the steel ball, which will cause the needle valve to close laxly. These pits are very small, indicating that the machining accuracy of the parts inside the injector is very precise.

The nozzle of the fuel injector - the fuel is injected into the cylinder from its head. In the entire fuel injector, its working environment is the worst, because it directly faces the extreme working environment of high temperature and high pressure in the cylinder. The tip of the needle valve of the nozzle plays the role of sealing the fuel, and it must be leak-free when there is no need for fuel injection. If the fuel injector drips oil, it will cause local overheating of the piston, and even cause the piston to perforate.

Orifices of injector nozzles. They are used to inject fuel into the cylinders and are so small in diameter that they are barely visible to the naked eye. The diameter of the hole is directly related to the injection quantity per unit time. If the fuel contains particulate impurities, it will cause irreversible wear to the injection hole. Over time, the diameter of the nozzle hole will become larger and larger. The consequence of the enlarged nozzle hole is that the fuel supply becomes larger, causing the torque to exceed the limit, black smoke, and high fuel consumption.