original 173-9268 0R9348 EX639348 Diesel Fuel Injector Nozzle for C7 C15 C18 3406E Engine Replacement Part new injector original new injector

Engineered exclusively for the 3126, 3126B, and 3126E HEUI diesel platforms, this 173-9268 unit injector delivers the precise fuel metering and fine spray atomization that these hydraulically actuated, electronically controlled engines demand. Each unit is built to original-type specification and matched to HEUI operating parameters, ensuring correct solenoid response, stable hydraulic intensification, and consistent injection timing across medium-duty truck, bus, construction, agricultural, generator set, and marine auxiliary applications.

The injector is available in multiple supply conditions — new aftermarket, remanufactured, rebuilt, original-type replacement, and exchange unit — and can be ordered individually or as a complete six-piece engine set. Every unit is factory tested for flow rate, leak rate, and solenoid function prior to shipment, and is backed by an extensive cross-reference database covering 0R9348, 0R9349, EX639348, EX639349, 145-9360, 155-1819, 118-1320, 169-7408, 171-9704, 171-9710, 173-1012, 173-4566, 173-9267, 173-9379, 173-9380, 188-1320, 196-1401, 222-5965, 222-5967, 126-0499, 131-7150, 164-3355, 169-7411, 173-4059, 218-4109, 10R-8999, 10R-9238, DE516, and 148-012-0052, supporting distributors, fleet maintenance programs, and engine rebuild shops.

Routine maintenance of the 3126 HEUI system is critical: use clean diesel, replace fuel filters at scheduled intervals, drain the water separator regularly, maintain clean engine oil with timely oil and air filter changes, inspect the injector harness, and run diagnostic scans on high-hour engines. Unused injectors should be stored in sealed, dry, dust-free packaging. Poor fuel quality and neglected oil service remain the leading causes of HEUI injector failure, so pairing replacement with proper system upkeep maximizes service life.