It is mounted in the engine block and directs a jet of oil toward the bottom of the piston, helping to reduce its temperature and lubricate the piston-cylinder assembly. It is located in the cylinder block, where its function is to spray oil under the piston for cooling and lubrication. It is made of metal, primarily steel.
This is a Cummins cylinder kit from the C Series 8.3 L family, specifically documented as a thin-wall/early block configuration, pre-1991. It is installed inside the cylinder block, one for each cylinder. The cylinder liner is mounted in the block; inside it, the piston operates, connected to the connecting rod via the piston pin. The kit restores the engine’s cylinder unit during an overhaul or in-frame repair. It includes the main wear components of the combustion system: piston, piston rings, piston pin, retainers, cylinder liner, and seal. It is used to restore compression, combustion gas sealing, oil control, and proper piston-to-cylinder fit.
Installed on Cummins 6C/L Series, ISC 8.3/L, QSC 8.3/L, ISL 8.9/9, and QSL 8.9 engines.
For this kit, I strongly recommend that you don’t just check the engine model. Check the ESN (Engine Serial Number) → CPL → Cummins QuickServe catalog → cylinder block number/casting number → early thin-wall vs. late thick-wall block → piston number → liner number → machine serial number (if applicable).
Piston Ring Set Cummins Engine ISC 8.3 – Engine QSC 8.3 – Engine ISL G
Used on Cummins engines in the ISC and QSC 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 ISC 8.3, QSC 8.3 and ISL G in some applications.
When purchasing a replacement engine, I recommend checking the ESN and CPL, because Cummins may use different piston/piston ring configurations.