Piston Ring Set Cummins Engine ISL 8.9 / 9, ISLe 8.9 – Engine QSL 8.9 / 9, QSLe 8.9
Used on Cummins engines in the ISL/QSL family and in 8.3–9 L applications. Located in the piston. Its function is to seal against combustion pressure, control lubricating oil, and transfer heat from the piston to the cylinder wall. Made of special steel/cast iron for piston rings.
Engines: Cummins ISL9, ISL/ISLe, QSL/QSL9; 6C8.3/GTA8.3 in some applications.
When purchasing a replacement engine, I recommend checking the ESN and CPL, because Cummins may use different piston/piston ring configurations within the same ISL/QSL family.