Bosch original 0986445003 Diesel Engine Fuel Unit Pump for Mercedes Benz OM904 OM906 OM926 Fuel Pump Element Assembly Replacement for OEM 0414799008 original new injector

Engineered as a genuine BOSCH 799 Series unit pump injector assembly, the 0986445003 delivers precise fuel metering and optimal atomization for heavy-duty diesel engines. Through a high-pressure delivery sequence, compressed fuel enters the injector chamber, an electronic control signal activates the needle mechanism, and a finely atomized spray pattern is injected into the combustion chamber. Multi-stage injection events—pilot, pre, main, and post injection—enhance combustion efficiency, reduce emissions, lower fuel consumption, and increase overall engine power output. This component is built to maintain long-term durability under severe operating conditions, making it a dependable replacement choice for demanding commercial and industrial environments.

The 0986445003 is fully compatible with a wide range of diesel engine platforms, including Cummins ISBe, ISDe, and ISF, Weichai WP, WP10, and WP12, Yuchai YC, YC6L, and YC6M, Dongfeng DCI and DCI11, FAW CA, Deutz, and Perkins engines. It supports vehicle and equipment brands such as Sinotruk HOWO, Shacman, Foton, Dongfeng, FAW Jiefang, JAC, CAMC, and Beiben. Typical deployment includes heavy-duty trucks, long-haul tractors, city buses, construction machinery, agricultural machinery, generator sets, marine auxiliary engines, and industrial power units across transportation, logistics, public transit, construction, agriculture, mining, marine, power generation, and industrial manufacturing sectors.

Proper installation requires a systematic checklist: replacing the fuel filter, cleaning the fuel rail, cleaning the injector bore, installing a new sealing washer, performing a leak test, verifying fuel pressure, and checking ECU calibration. Preventive maintenance best practices recommend using clean diesel fuel, avoiding water contamination, replacing filters regularly, monitoring injector correction values, and conducting periodic diagnostics. Common fault codes associated with this injector include Injector Circuit Fault, Fuel Metering Deviation, Excessive Return Flow, Low Rail Pressure, High Rail Pressure, and Cylinder Balance Fault, all of which can be identified through standard diagnostic procedures.