Cummins original 3766446 Fuel Injector, Replacement for OEM 4088427, Cross Reference 4902827 4088431, Diesel Common Rail Engine Excavator Injector original new injector

Specified for Cummins’ 23-liter QSK23 platform, the 3766446 fuel injector is a heavy-duty diesel injection component for large-displacement industrial engines. Public aftermarket listings group it with 4088426, 4088427, 4088428, 4326639, 4326780, 4326781, 4326784, 4928346, 4928349, 4087887, and 4010163; these are cross-references, not guaranteed interchangeability. Related listings also cite QSX23, QSK45, QSK60, QSX45, and QSX60. Confirm fitment by engine serial number, CPL, ECM calibration, injector code, and the removed injector’s marking before shipment.

As the final stage of fuel delivery, the injector meters diesel, opens at the correct injection timing, and atomizes fuel into fine droplets at the required pressure and spray angle. Correct matching supports stable combustion, helping the QSK23 maintain power output, reduce smoke, and improve fuel efficiency while protecting pistons, cylinder liners, valves, and turbocharger components from poor-combustion damage. Its industrial positioning rests on precise fuel metering, high-pressure injection performance, stable atomization, durable construction, and leakage control.

The QSK23 is an inline six-cylinder, four-cycle diesel with 170 mm bore and stroke, turbocharged and charge-air-cooled. Cummins lists well-servicing ratings of 760–950 hp (567–708 kW) and generator ratings of 545–725 kW prime and 600–800 kW standby. This injector therefore serves generator sets, oilfield and well-servicing equipment, mining machinery, construction equipment, and industrial power units, as well as engine rebuild shops and diesel parts distributors seeking a QSK23-focused replacement with documented verification.