Caterpillar original Caterpillar 203-3464 diesel fuel injector common rail spare part replacement for OEM new injector original new injector

The Caterpillar CAT C12 Fuel Injector 203-3464 / 2033464 is a direct replacement electronic unit injector engineered for the CAT C12 diesel engine family. As a 12.0-liter inline six-cylinder power platform with electronically controlled unit injection, the CAT C12 depends on injector precision to maintain stable idle quality, efficient fuel metering, and reliable cold-starting performance across commercial ratings between 340–490 bhp at 1800–2300 rpm. This injector assembly is built to deliver the atomization quality and response characteristics required for heavy-duty on-highway and off-road service conditions.

Designed for engine-specific fitment on trucks, buses, excavators, generator sets, marine propulsion units, mining equipment, agricultural machinery, and industrial power units, the 203-3464 supports engine rebuilding programs, fleet maintenance operations, and aftermarket parts distribution. The assembly helps recover lost power, reduce excessive smoke output, stabilize rough idle behavior, and support overall fuel economy when worn or leaking injectors are replaced. Matched-set replacement is recommended during major engine overhaul to ensure balanced cylinder performance.

Cross references including 10R-1003, 212-3463, 317-5278, 281-7152, 20R-0055, 212-3465, 212-3468, 317-5279, 166-0149, 10R-1258, and 187-6549 provide flexible sourcing options for distributors and service operations managing mixed CAT C12 fleets. Routine maintenance practices such as scheduled fuel filter replacement, water separator draining, diagnostic scanning, cylinder balance testing, return leakage checks, and observation of exhaust smoke color help maximize injector service life and protect downstream engine components.