Caterpillar original Diesel Fuel Injector 203-3464 317-5279 116-5425 187-6549, for heavy duty diesel engine application, OEM Replacement for Excavator Diesel Engines original new injector

The 203-3464 (alternate compact part number 2033464) is an industrial-grade, original-quality diesel fuel injector assembly purpose-built for Caterpillar CAT C12 12.0-liter inline six-cylinder diesel engine families. Designed as an OEM replacement for the C12’s electronically controlled unit injection system, it mounts in the cylinder head injector bore to deliver precise fuel metering, consistent atomization, and stable combustion support for heavy-duty operating conditions. Six units are recommended for a full C12 engine replacement set.
This injector is compatible with a wide range of C12-equipped assets, including heavy-duty on-highway trucks and buses, excavators, construction and mining equipment, agricultural machinery, marine propulsion systems, generator sets, and industrial engine rebuild projects. Common aftermarket cross-reference numbers include 10R-1003, 212-3463, 317-5278, 281-7152, and 20R-0055, with related market listing numbers covering 317-5279 and 187-6549. All compatibility must be confirmed via engine serial number, original injector marking, and part number before purchase, as C12 injector calibrations vary by power rating and emissions configuration.
Operating in sync with the C12’s engine electronic control system and sensor inputs for engine load, speed, temperature, and fuel demand, the injector adjusts injection timing and fuel volume dynamically to match operating conditions. It atomizes diesel into fine droplets to support stable, efficient combustion before cutting off injection precisely as signaled. Flexible packaging options, including neutral, branded, customized, and export-grade packing, are available to meet bulk B2B distributor and aftermarket supply needs.