Caterpillar original C9 Engine Fuel Injector 258-8745 266-4446, Cross Reference 328-2578, for Construction Machinery, Replacement for 236-0957 original new injector

Purpose-built for Caterpillar’s C9 diesel engine platform, the CAT 258-8745 original-new fuel injector delivers OEM-grade performance for demanding industrial operating environments. Precision engineered as a direct replacement component, it meets and exceeds official Caterpillar performance standards, with primary OE number 258-8745 and verified cross-reference compatibility with part numbers used across global diesel parts and remanufacturing databases.

As a high-pressure common rail injector, it operates in sync with the engine control unit (ECU) to separate fuel pressure generation from injection timing, enabling highly precise fuel delivery regulation. Its hardened steel alloy construction withstands sustained high-pressure operation, while the multi-hole nozzle produces a finely atomized spray pattern to boost combustion efficiency, optimize power output, and reduce exhaust emissions. For C9 ACERT variants, it integrates with real-time combustion control strategies to adjust injection timing and pressure dynamics based on load, temperature, and engine speed.

Validated for a broad range of C9-powered equipment, the injector fits 330D/336D/340D excavators, 966H/972H wheel loaders, industrial generators, mining machinery, and marine auxiliary systems. It is available in either OEM packaging or neutral aftermarket packaging to support diverse B2B sourcing requirements, serving construction, power generation, mining, and off-road industrial worksites worldwide.