Cummins original Fuel Injector Cross Reference 43095851 4964170 4964173, Primary Part Y431KO5199, Replacement for OEM, Common Rail Injector for Industrial Applications original new injector

For heavy-duty QSK19 diesel power systems, the Y431KO5199 fuel injector is a Cummins common rail injector reference for industrial replacement sourcing. Its primary application is the Cummins QSK19 diesel engine, a 19 L inline six-cylinder platform. Equipment coverage includes generator sets, mining equipment, marine and rail power units, oil and gas machinery, construction machines, quarry equipment, and crushing plants. Related supplier-market numbers include Y431K05394, FO0BJ10006, 4955526, and Y431K05246, helping B2B buyers consolidate cross-reference searches.

The injector receives high-pressure diesel fuel, opens according to ECM command, atomizes fuel through precision nozzle holes, supports stable combustion, and returns excess fuel through the return circuit. Key features are precision fuel metering, fine atomization, high-pressure fuel-system compatibility, stable injection response, and industrial durability. On QSK19 engines using MCRS, precise fuel injection control helps reduce noise, vibration, and smoke while optimizing fuel economy. Export-ready packaging and pre-shipment quality inspection support international B2B supply.

Before purchase, verify interchange using the old injector label, engine serial number, CPL number, and fuel-system version. 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 engine-serial-number-specific Cummins service data for torque values and procedures. After installation, prime the fuel system, check for leakage and diagnostic codes, and perform a controlled load test. Clean fuel, timely filter replacement, and water-separator draining support routine maintenance.