Caterpillar original 0R-3389 Diesel Engine Parts Common Rail Fuel Pump Nozzle Replacement for OEM 3116 3208 Excavator Truck Marine Engine original new injector

The CAT 3116 fuel injector 0R-3389 is engineered for the Caterpillar 3116 inline 6-cylinder, 4-stroke diesel engine with 6.6 L displacement, 105 mm x 127 mm bore and stroke, turbocharged-aftercooled aspiration, and mechanical governor rated at 2800 rpm. It is also referenced for related CAT 3114, CAT 3126, CAT 3126B, CAT C7, and Caterpillar 3116 DIT applications when the engine serial number, arrangement number, and OE reference are verified. Marine power ratings such as 224 bkW / 300 bhp and 261 bkW / 350 bhp confirm the injector's suitability for propulsion and auxiliary duties at sea.

This heavy-duty mechanical unit injector delivers precise fuel metering and fine atomization, supporting clean combustion, stable idle, and consistent cylinder output. A rich OE-number catalog covering 0R-3389, 4P-2995, 0R-8471, 7E-8952, 7E-8729, 0R-4374, 0R-3006, 127-8216, 127-8218, 107-7735, 1565023, 0R-8682, 127-8213, 127-8222, and 127-8205 enables flexible reman, replacement, and rebuild programs. The product fits medium-duty trucks, buses, marine vessels, excavators, wheel loaders, generator sets, industrial power units, mining support equipment, and agricultural equipment, making it a strong export-ready spare part for distributors, wholesalers, and B2B sellers.

For reliable service life, use clean diesel fuel, replace the fuel filter regularly, drain the water separator, and inspect the injector bore, seals, O-rings, washers, and sleeves before installation. Always follow Caterpillar service manual torque values, prime the fuel system, and verify injector performance by checking for leaks, rough idle, smoke, misfire, knock, vibration, and poor acceleration. Diagnostic actions include fuel pressure, return flow, leak-off, cylinder balance, compression, spray quality, and timing checks to ensure dependable long-term operation.