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VOLVO Fuel injector 21340612BEBE4D08002 BEBE4D16002 BEBE4D24002
FUNCTION
1. High-Pressure Injection: Mechanically driven by the engine's camshaft, the injector generates extremely high fuel pressure internally. This immense pressure forces diesel through precision nozzle orifices into the combustion chamber, atomizing it into ultra-fine droplets to ensure thorough mixing with air and, consequently, complete combustion.
2. Precision Timing and Metering: An electromagnetic valve located at the top of the injector receives electronic signals from the Engine Control Unit (ECU). This mechanism determines the exact moment during the piston's compression stroke at which fuel injection begins-a critical factor that directly influences the engine's power output and noise levels.
3. Multiple Injection Events: A pre-injection phase releases a small amount of fuel prior to the main injection; this serves to moderate the rate of pressure rise within the cylinder, thereby significantly reducing diesel engine noise. The main injection delivers the primary power required for vehicle propulsion, while a post-injection phase-occurring during the latter stages of combustion-helps elevate exhaust gas temperatures to facilitate the regeneration process of the exhaust aftertreatment system.
Internal Components
1. Solenoid Actuator Assembly: Located at the top, it is responsible for receiving signals from the ECU. Its opening and closing actions determine the start and end of fuel injection.
2. High-Pressure Pumping Element: Driven by a rocker arm, it undergoes reciprocating motion to compress the low-pressure diesel entering the injector to extremely high pressure.
3. Nozzle & Needle Valve: Located at the bottom, this component is responsible for the final atomization of the fuel. It typically features 6 to 8 spray holes with diameters in the micron range.
4. Control Valve: Contains a precision internal spool; wear on this component is the primary cause of issues such as "excessive fuel return" or "difficulty starting."
DETAILS
| DESCRIPTION | Fuel injector | PART NUMBER | 21340612BEBE4D08002 BEBE4D16002 BEBE4D24002 |
| WEIGHT |
1.2 kg |
VOLUME | 29.5*11.5*7 (cm) |
| TRUCK MOLDE | Donaldson | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Failure Modes
Difficulty Cold-Starting: Typically caused by a poor seal in the internal control valve, resulting in slow pressure buildup.
Lack of Power / Black Smoke: Most often due to carbon buildup on the nozzle tips or enlarged nozzle orifices caused by wear, leading to poor fuel atomization.
Engine Vibration (Misfiring): Caused by a failed solenoid coil or poor electrical contact resulting from oil ingress into the wiring harness connector.
Fuel Dilution of Engine Oil: Caused by a damaged central O-ring, allowing diesel from the fuel passage to leak into the oil chamber located above the cylinder head.
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