original 387-9431 Engine Fuel Injector for Excavator C7 C9 3406e Common Rail Diesel Engine Parts 5577637 new injector original new injector

The C7 C9 diesel fuel injector 387-9431 3879431 is an industrial-grade common rail injector developed for precision fuel metering and high-pressure diesel injection in C7 and C9 engine platforms, including the C7 ACERT configuration and C9 generator set, marine engine, industrial engine, and petroleum engine arrangements. The injector is designed to meet the performance expectations of engine rebuild, fleet maintenance, and remanufactured replacement programs, providing a reliable fit for SR4B generator service as well as mining and construction machinery operations where consistent fuel delivery is critical.

This injector carries the authorized OE number 387-9431 and is fully supported by the cross-reference identifiers CA3879431, 10R-9003, 20R-8069, 328-2580, 293-4074, 267-9710, 573-4231, and 20R-8846, allowing buyers, distributors, and diesel service workshops to locate the correct injector across different parts catalogs and global search systems. Multiple cross-reference numbers simplify sourcing for export distribution, aftermarket repair, and engine overhaul facilities managing mixed engine fleets. Fitment on 330D, 330D L, 336D, 324D, 325D, and 329D excavators further extends the application range of this common rail fuel injector across heavy equipment operations.

For C7 and C9 engine applications, the correct injector must be confirmed by engine serial number, old injector number, trim code, machine model, and engine arrangement number before installation. Recommended maintenance practices include using clean diesel fuel, replacing the fuel filter on schedule, draining the water separator, keeping the fuel tank free from water and sediment, inspecting injector performance during service, and monitoring engine diagnostics. Professional injector testing and calibration equipment should be used when required to verify spray pattern, return flow, and cylinder balance.