Caterpillar original Replacement Fuel Injector 0R-3419 for 3204 Engine, compatible with multiple engine series, Cross Reference 4W-7015, Fits Later Model 3400 Equipment, 4W-7018 original new injector

Designed for Caterpillar 3204 series diesel engines, the CAT 0R-3419 fuel injection nozzle assembly is a remanufactured OEM replacement engineered for precise fuel metering and atomization. Pressurized fuel lifts the needle valve when it exceeds the calibrated spring force, then passes through precision micro-orifices to form a uniform spray. As pressure falls, the needle reseats to prevent fuel dribble and support accurate injection timing, complete combustion, improved power output, and reduced smoke emissions.
OEM-level manufacturing combines micron-level orifice machining, calibrated opening pressure, heat-treated alloy steel, and a wear-resistant needle and seat. A corrosion-resistant surface treatment and heavy-duty construction support reliable operation under high-temperature, high-load conditions. The uniform spray pattern helps reduce carbon buildup while improving fuel economy and engine response. The nozzle is also suitable for Caterpillar Reman programs and professional diesel injector rebuild processes, making it practical for fleet maintenance and industrial service operations.
Compatibility covers 3204, 3204 NA, 3204 Turbo, generator set, and marine configurations, with cross references including 4W-7015, 1W-3995, 8N-7004, 1W-1354, 1W-4105, 2W-4387, and 7W-7015. Applications span Caterpillar loaders, tractors, tool carriers, excavators, backhoe loaders, and wheel skidders. For dependable service, clean the injector bore, lubricate seals with clean diesel, use a calibrated torque wrench, and bleed and leak-check the fuel system. Clean fuel, scheduled filter replacement, and periodic bench testing help preserve spray quality and service life.