original 198-6605 Diesel Engine Spare Parts Fuel Injector Pump 10R0782 Replacement for OEM 322C  original new injector

Engineered as a direct-fit HEUI fuel injector for the 3126 engine family, this 198-6605 unit injector is purpose-built to match the actuation pressure, fuel flow rate, and ECM command response of 3126, 3126B, 3126E, and selected C7-related replacement applications. The Hydraulic Electronic Unit Injector design uses high-pressure engine oil to generate injection force, delivering precise fuel atomization and stable cylinder-to-cylinder balance across all six cylinders in the 3126 series platform.

This injector is widely applied across truck, marine, industrial, construction, excavator, generator, bus, and off-highway machinery installations that rely on the 3126 diesel engine. Its ECM-compatible solenoid and wiring interface support accurate diagnostic communication, while the heavy-duty internal components help maintain consistent injection timing under high-load operating conditions. Cross-reference coverage with 10R-0781, 197-7107, 199-6065, 222-5926, and EX630781 allows flexible sourcing for fleet operators, distributors, and engine rebuild shops managing mixed 3126 series inventory.

Routine maintenance of the HEUI system is essential for long injector service life. Operators should use clean diesel fuel, replace the fuel filter at recommended intervals, drain the water separator regularly, and maintain correct engine oil pressure because the injectors depend on high-pressure lubrication oil for actuation. Inspecting the injector harness, connectors, and actuation pressure during hard starting, rough idle, misfire, or power loss helps identify failing units before secondary engine damage occurs, ensuring reliable performance across 3126 series applications.