Cummins original Common Rail Fuel Injector 4089972 4924587 Replacement OEM 4964171 4955524 for QSK19 QSK38 QSK50 Loader Bulldozer Excavator Sprayer Truck original new injector

For maintenance teams supporting large diesel power systems, the Cummins QSK19 Fuel Injector 4089972 is a heavy-duty injection component intended for fuel system repair, injector replacement and engine overhaul. It is marketed primarily for the Cummins QSK19 19L engine platform, with relevant uses across marine engines, generator sets, mining equipment, rail engines, oilfield units and industrial power systems. Public supplier listings also associate the number with QSK38 and QSK60, but those applications require separate confirmation.

The injector meters and atomizes diesel fuel into the combustion chamber. Correct injector operation helps support stable combustion, smooth idle, high torque, lower smoke, normal fuel consumption and reliable performance in demanding service. For platform context, Cummins describes the QSK19 as combining electronic controls with a high-pressure injection system to support clean, powerful and efficient operation. These engine-level characteristics depend on the complete fuel system and correct injector selection.

Related search references include Bosch F00BL0J019, 4964170 and 4924587. Y431K05246, Y431K05248 and 4928104 also appear in supplier listings, but with less consistent details; none should be treated as a guaranteed direct replacement solely from the listing. Before ordering, buyers should provide the engine model, engine serial number, CPL, old injector number and injector photo. Bosch or Cummins numbers, injector code, connector type and fuel system version should also be checked where available to confirm compatibility before shipment.