Cummins original Replacement for Fuel Injector 4326639, compatible with QSK78, QSK19, Q60 engines, cross references 4087889, 4087893, 4088416, for construction machinery original new injector

For maintenance teams supporting high-horsepower Cummins engines, fuel injector 4326639 is a heavy-duty diesel injector assembly for selected QSK60, QSK45 and QSK23 applications. Public aftermarket references group 4326639 with 4088427 and 4326779; these numbers support inquiry matching, but they do not confirm direct interchange. For QSK60 buyers, the engine platform is a 60 L V16 diesel listed by Cummins at 2000–2700 hp, with HPI and MCR fuel-system options and official marine and mining application categories.

In severe-duty service, this original-type injector is positioned around the functions that matter most: accurate fuel metering, consistent atomization, high-pressure sealing and stable combustion, with low downtime critical to equipment availability. On QSK60 MCR configurations, Cummins describes electronic control of fuel-pump and injector operation for injection pressure and timing, together with an integrated accumulator at each injector to improve pressure stability. These system features make correct injector identification essential before replacement.

The product is relevant to B2B sourcing for marine, mining, power-generation, oilfield and industrial power units where the referenced application applies. Before ordering, please verify the Engine Serial Number, CPL, old injector number, fuel-system type, engine model, calibration and emissions level, and provide injector photos. Related QSK injector-family numbers can be quoted separately, but only 4088427 and 4326779 are presented here as the main public related references for 4326639.