original 222-5961 Diesel Common Rail Fuel Injector for C7 C9 Excavator 233-3536 295-1408 222-5959 236-0973 235-5261 238-8901 original new injector

Engineered specifically for the C7 series diesel platform, this HEUI fuel injector delivers precise fuel metering and reliable electronic injection control for the C7 and C7 7.2L engines. The injector receives diesel fuel from the supply circuit while using high-pressure engine oil to generate the actuation pressure required by the HEUI system, and the engine control module activates the solenoid to manage injection timing and quantity. Atomized fuel is delivered through the nozzle directly into the combustion chamber, supporting stable combustion across medium-duty truck, bus, construction machinery, excavator, loader, generator set, and general industrial applications. It is offered as a new, remanufactured, rebuilt, aftermarket, or original style replacement, available individually or as a complete set of six injectors.
Because the HEUI system depends on engine oil pressure for actuation, correct maintenance is essential for long service life. Operators should use clean diesel fuel, replace fuel filters on schedule, maintain proper engine oil quality, change oil filters regularly, drain water separators, and inspect wiring connectors. Routine ECM diagnostics, cylinder balance tests, and fuel pressure checks help detect early signs of injector wear before major engine damage develops, which is especially important for fleet operators, mining equipment, and generator set installations running long duty cycles.
Common symptoms of a failing C7 injector include hard starting, rough idle, white or black smoke, engine misfire, reduced power, high fuel consumption, knocking, fuel dilution, excessive cranking, check engine light, and uneven exhaust temperature. Before replacement, technicians should verify fuel supply pressure, high-pressure oil actuation pressure, injector solenoid resistance, wiring harness condition, ECM fault codes, trim code programming, injector balance, cylinder cut-out results, and engine compression. Confirming the fuel supply, oil actuation system, electrical circuit, and ECM data first prevents unnecessary injector replacement on C7 engines.