Denso Injector Parts

1. Product Information

Denso injector parts are the individual components inside a Denso common rail fuel injector, used mainly in diesel engines. These parts work together to precisely meter and spray fuel into the combustion chamber.

Main Denso Common Rail Injector Parts

1. Injector Body
The main housing of the injector contains internal fuel passages and high-pressure chambers

2. Nozzle (Injector Nozzle)
The part that sprays fuel into the engine determines the spray pattern and atomization
Common types: DLLA, G2, G3, G4

3. Nozzle Needle (Valve Needle)
Moves up and down inside the nozzle. Opens and closes fuel flow to the combustion chamber

4. Control Valve (Servo Valve)
Controls injector opening and closing. Operated by the return fuel pressure One of the most critical and wear-sensitive parts

5. Control Chamber
Small chamber above the needle. Pressure change here causes needle movement

6. Shim / Adjusting Washer
Used to adjust injector opening pressure and response. Critical during injector calibration

7. Spring
Returns the needle to the closed position. Maintains correct closing force

8. Solenoid Valve (Electromagnetic Injector)
ECU-controlled coil opens the control valve electrically, or a Piezo Stack (Piezo Injector) is used instead of a solenoid in some injectors. Faster response, more precise injection

9. Electrical Connector
Connects the injector to the ECU wiring harness

10. Return Connector / Leak-Off Outlet
Returns excess fuel to the tank. Also used to cool the injector

11. Seals & Copper Washer
Prevents combustion gas and fuel leaks. A copper washer seals the injector to the cylinder head

Common Denso Injector Types

Solenoid injectors (most common)
Piezo injectors (high-end systems)

Common Wear / Failure Parts

Control valve (rough idle, knock)
Nozzle & needle (smoke, poor atomization)
Solenoid coil (no injection/misfire)
Seals & washers (compression leaks)

2. Product Model List