Cummins original HPI Diesel Fuel Injector 4326640 4088431, Cross Reference 4326780 4326784, for Industrial Generator Set, Fits Q60 Q23 Q19 QSK60 QSK45 QSX23 QSK23 original new injector

Fuel injector 4326640 is intended for selected Cummins QSK23, QSX23 and QSK60 diesel engine applications, with QSK23 as the primary product focus. It controls the final stage of fuel delivery by metering diesel, responding to ECM injection control, and atomizing fuel into the combustion chamber at the correct timing, pressure and spray pattern. Related market reference numbers include 4087977, 6560-11-1114, 6560-11-1414, 4088427, 4326639 and 4928349 for inquiry and warehouse matching.

A correctly matched injector supports cylinder balance and complete combustion, helping maintain stable power, smoother idle, better starting, lower fuel consumption and reduced exhaust smoke. It also helps control return fuel leakage and reduce the risk of damage to pistons, valves, turbochargers and cylinder liners. For application context, the QSK23 is a 23-liter, inline six-cylinder, four-cycle diesel engine with 170 mm bore and stroke and a turbocharged, charge-air-cooled design.

This product page targets generator maintenance, oilfield service, mining equipment repair, construction machinery, industrial power units, marine auxiliary power, engine rebuild shops, heavy-equipment fleets and diesel parts distribution. Because public supplier application data is inconsistent, compatibility must not be confirmed by engine model alone. Before order processing, verify the ESN, CPL, original injector number, ECM information and injector photographs. Cross-references are not guaranteed interchangeable OE numbers unless confirmed through Cummins QuickServe, ESN or CPL data, original injector markings, or supplier test data.