Bosch original Common Rail Fuel Injector Assembly 0445120252 for Cummins QSB 5.9 Engine, replacement for related parts, cross reference 0445120255, 5263315, 4981126, for truck original new injector

Built for precise high-pressure diesel delivery, the Bosch 0445120252 (0 445 120 252) is an original common rail fuel injector from the Bosch 120 Series, using CRIN1-14/16 technology. Manufactured according to Bosch OE specifiions and designed for operating pressure up to 1600+ bar, it provides accurate fuel metering and optimized atomization. These functions support improved combustion efficiency, reduced exhaust emissions, lower fuel consumption, improved engine response and extended service life in demanding diesel appliions.
Compatibility coverage includes Cummins QSB5.9, QSB6.7, ISB, ISC and QSC engine families, as well as industrial, agricultural, generator, marine and construction-equipment diesel engines. Typical equipment uses include heavy-duty trucks, commercial buses, excavators, loaders, tractors, harvesters, mining equipment and industrial power systems. Cross references include Cummins 4981126, 5263315, 5263315NX, 5263315PX and 5263315RX, with Bosch 0445120152, 0445120262 and 0445120296 listed as replacement references. OE and injector-code verifiion is recommended before installation.
Within the common rail system, the ECU controls injection timing and quantity; the solenoid actuates the nozzle needle so pressurized fuel is atomized through precision micro-holes. For reliable service, replace the sealing washer, clean the injector bore, prevent contamination and apply OEM torque specifiions. Perform ECU coding when required, followed by leak-off, rail-pressure, idle-stability and injector-balance checks. Regular filter replacement, premium diesel fuel and water-contamination prevention help maintain injector performance.