original 7C-4174 7C-9577 4P-9077 111-3718 Diesel Fuel Injector Pump Assembly For 3516 Engine new injector original new injector

Engineered as a direct-fit replacement for the 3512 and 3512A engine platforms, the 7C-4174 high pressure diesel fuel injector delivers OEM-grade metering precision and consistent spray patterns across heavy-duty operating cycles. Manufactured from high-strength alloy steel and validated through 100% flow and spray testing, this injector supports reliable cold starts, stable idle, and full-load combustion efficiency in marine propulsion, power generation, mining, oil and gas, and large industrial stationary applications where the 3512A series is widely deployed.

The 7C-4174 is fully interchangeable with multiple part references, including 9Y-3773, 0R-2923, OR-2923, 961-4357, 111-3718, 224-9090, 4P-9075, 4P-9076, and 4P-9077, allowing maintenance teams to consolidate inventory while maintaining factory-equivalent performance. Offered in both new and remanufactured configurations with industrial export packaging and a 12-month standard warranty, the injector is calibrated to original tolerances to ensure proper fuel delivery on the 3512 and 3512A base engines.

Routine best practices extend injector service life: use ultra-low sulfur diesel, replace fuel filters at scheduled intervals, prevent water contamination, and monitor for abnormal exhaust smoke or power loss. During installation, clean the cylinder head bore and high pressure line connections, inspect sealing surfaces, replace washers and gaskets, torque the injector to official specifications, bleed the fuel system, and confirm the calibration code matches the engine requirement. Periodic injector performance testing is recommended to maintain combustion efficiency across the engine's service interval.