Cummins QSX15 parts

The QSX15 is the electronically controlled 15-litre, the successor in service terms to the mechanical N14 and a common engine under both mid-size gensets and heavy vehicles in the region. It uses full-authority electronic control with a high-pressure fuel system, and its parts list reflects that: a substantial share of the 71 numbers here are electronic or fuel-system components where fitment is calibration-dependent.

Parts on this page are catalogued for the QSX15. Where a component is shared with the ISX family it is listed on both pages, because a buyer searching one engine name should not have to know the family relationship to find the number.

The characteristic issue on QSX15 units in this region is fuel quality rather than mechanical wear. High-pressure fuel systems are considerably less tolerant of water and particulate contamination than the PT systems on older Cummins engines, and the failures that result — injector, high-pressure pump, rail — are expensive. If you are replacing an injector on a QSX15 and the fuel filtration history is unknown, quote the filters and a fuel system clean in the same enquiry. Fitting a new injector into a contaminated system buys you a few months at best.

For a quotation, send the engine serial number and the ECM calibration if it can be read, plus any active fault codes. For genset installations the set serial matters as well where control or protection parts are involved.