Caterpillar original 116-5425 fuel injector replacement for OEM diesel engine spare part original new injector

The CAT 116-5425 / 1165425 diesel fuel injector is engineered as an OE-style replacement for Caterpillar C12, C-12 and 3196 diesel engines used across heavy duty trucks, construction machinery, mining equipment, power generation sets, marine auxiliary units and general industrial powerplants. As an electronic unit injector within the Caterpillar fuel system, it delivers precise fuel metering and fine atomization to support stable combustion, consistent idle quality and balanced cylinder output across demanding duty cycles.

Built with high-strength internal components and wear-resistant nozzle hardware, the injector maintains stable injection pressure and dependable sealing under continuous heavy load operation. Its direct replacement fitment allows straightforward installation into C12 / C-12 platforms, while broad cross-reference coverage — including 0R-4988, 0R4988, 10R-0968, 10R0968, 156-1011, 1561011, 212-3466, 2123466, EX630968 and 630968 — simplifies sourcing for engine rebuilders, fleet maintenance operations and global parts distributors searching equivalent replacement numbers for the C12 product family.

For reliable service life, the injector should be operated with clean diesel fuel, scheduled fuel filter replacement, regular water separator draining and routine inspection for external leakage or changes in exhaust smoke. When multiple injectors on a C12 engine show age, imbalance or symptoms such as rough idle, hard starting, power loss or high fuel consumption, technicians are advised to perform injector flow and spray testing and consider a full matched engine set replacement to restore uniform performance.