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Cummins QSX & QSM Parts

Heavy-duty replacement and rebuild parts for the Cummins QSX (QSX15) and QSM (QSM11) engine families — the electronically managed platforms found in on-highway trucks, off-road equipment, marine, and power-gen applications. We stock fuel injectors, cylinder heads, turbochargers, head gaskets, and full rebuild kits for both engine lines.

Not sure your QSX or QSM number matches what you need? Send us the part number off the engine, the ECM build, or a competitor reference and we'll cross-reference it. Same-day shipping on in-stock parts from Colorado, free freight over $1,000. Call or text (720) 445-6249 or request a quote.

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Choosing the Right Cummins QSX & QSM Parts

Heavy-duty diesel components must be matched to the exact engine and application. Before ordering from this collection, verify the part number, engine model, engine serial number, and any casting or calibration number shown on the original component.

Fitment information to have ready

  • OEM, dealer, casting, or interchange part number
  • Engine manufacturer, model, and engine serial number (ESN)
  • Truck year and model when the component is chassis-specific
  • Core details for remanufactured or exchange components

Need a fitment check?

Use the OEM cross-reference tool or text a clear photo of the part tag to (720) 445-6249. A JAK'S Diesel specialist can confirm the match before the part ships.

Got a Number We Don't List?

Text a photo of the part tag — a specialist crosses it and quotes you fast.

Text a Part-Tag Photo(720) 445-6249