X15 Basics
The Cummins X15 (including ISX15 and QSX15) powers most North American heavy trucks and countless gensets. It is a high-pressure common-rail engine where fuel system condition decides injector life.
High-Demand Parts
Fleet demand concentrates on X15 inframe overhaul kits, piston assemblies, cylinder liners, head gasket kits, main bearings, injectors and turbochargers (Holset HE series). EGR coolers and water pumps are the most replaced accessories.
Ordering the Right Kit
X15 kits vary by ESN (engine serial number) prefix and emissions tier. Send us the ESN and we confirm the correct X15 parts and kit contents before quoting.
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Pistons, rings, liners, wrist pins, main and rod bearings, gaskets and seals - everything for an in-chassis rebuild. See Cummins overhaul kits.
Yes - remanufactured heads, injectors and turbos are available; see remanufactured engine parts.