Cummins original Y431K05420 High Performance Diesel Fuel Injector, Common Rail Diesel Injector Assembly, Replacement for OEM 4928106, Cross Reference 43095851 4089972 original new injector

Designed for the Cummins QSK19 service market, the Y431K05420 fuel injector is a heavy-duty common rail diesel injector reference for QSK19, QSK19G, QSK-Tier3 and QSK19 MCRS applications. The QSK19 is a 19-liter inline six-cylinder engine; relevant G-Drive configurations use high-pressure fuel pump technology, a Modular Common Rail Fuel System and integrated electronic control. This injector group is commonly cross-referenced with Bosch F00BL0J019, F00BL0J020 and 0986435612 / 0 986 435 612, as well as Cummins 4964170 and 4955524, supporting identification by body marking, service number or OE reference.

Within the fuel system, the injector controls diesel delivery into the combustion chamber. Accurate metering and atomization influence starting performance, idle quality, smoke level, fuel consumption, exhaust temperature, cylinder balance and power output. These functions are important where QSK19 engines operate under heavy loads, long service hours, high vibration, dust, marine humidity or demanding generator, rail and oilfield duty cycles. Typical equipment includes generator sets, mining haul trucks, drilling rigs, crushers, marine vessels, compressor drives, pump units, switching locomotives, cranes, large excavators and stationary industrial power packs.

This reference serves diesel repair shops, engine rebuilders, maintenance teams and global parts distributors. Before ordering, buyers should confirm fitment by engine serial number, old injector number, CPL, ECM calibration, equipment model, emissions tier and original injector label, and verify the required condition with the supplier.