Cummins original Y431KO5205 Engine Fuel Injector for K38 QSK19, for heavy duty diesel engine application, Replacement for OEM 4955526, 4964172, Cross Reference 0986435912 original new injector

For B2B buyers sourcing Cummins QSK-series injector references, the Y431KO5205 diesel fuel injector assembly is positioned for heavy-duty QSK19 engine applications. Its main search number is Y431KO5205, with Y431K05205 as a common typing alias. Typical equipment coverage includes mining and haul trucks, diesel generator sets, standby power systems, oilfield equipment, marine engines, rail power units, construction machinery, compressors, pump sets, and quarry equipment. Related QSK23, QSK38, QSK50, and QSK60 searches require application verification before sale.

In operation, the injector receives high-pressure diesel fuel, responds to the engine control command, and atomizes fuel through precision nozzle holes to support stable combustion, while excess fuel returns through the return circuit. On QSK19 engines equipped with the Modular Common Rail Fuel System, accurate fuel control supports idle stability, lower noise and vibration, and efficient power delivery. Key sourcing advantages include precision fuel metering, stable injection response, fine atomization, compatibility with the correctly matched high-pressure system, and export-ready packaging.

Before ordering, confirm the original injector label, engine serial number, engine model, CPL number, ECM or fuel-system version, and equipment model; listed cross numbers are search references, not unconditional interchange confirmation. During service, use clean diesel, timely filter replacement, water-separator draining, wiring inspection, diagnostic-code checks, and return-flow testing when symptoms appear. Correct installation, leak checks, and a controlled load test support reliable commissioning.