Cummins original Fuel Injector Y431KO5417 for K38 QSK38, for heavy duty diesel engine application, Replacement for OEM 4955526, Cross Reference 0986435912 4964172 original new injector

For demanding Cummins QSK19 service environments, the Y431KO5417 fuel injector, also listed as Y431K05417, is positioned as a heavy-duty common rail diesel injector replacement. It supports sourcing for mining equipment, diesel generator sets, marine power systems, oil and gas machinery, rail power units, construction machinery, crushing equipment, and industrial power packs. Final fitment should be confirmed against the old injector number, engine serial number, CPL number, ECM version, fuel-system type, and equipment model.

The injector receives high-pressure diesel fuel, opens in response to ECM command, atomizes fuel through precision nozzle holes, and returns excess fuel through the return circuit. Its B2B value centers on precision fuel metering, fine atomization, stable injection response, high-pressure fuel-system compatibility, and industrial durability. On QSK19 platforms using MCRS, precise fuel-event control helps reduce noise, vibration, and smoke while supporting fuel-economy optimization. Export-ready packaging and pre-shipment quality inspection support international parts supply.

Related public-market references include Y431K05558, 4964171, 4964170, 4955524, 4918073, 2867149, Y431K05248, F00BL0J018, F00BL0J019, and F00BL0J020; these references aid search matching but do not replace interchange verification. Before installation, keep the injector bore and fuel-line area clean, replace required seals, and inspect the high-pressure pipe, return line, connector, and wiring harness. Use Cummins service data for torque values, then bleed the system, check for leakage and diagnostic codes, and perform a controlled load test.