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The cylinder liner is installed inside the cylinder block, forming the cylindrical surface along which the piston moves. The kit is designed to provide the piston’s sliding surface, maintain the correct cylinder geometry, rebuild the cylinder during an engine overhaul, and ensure a proper seal using the included sealing elements. The kit includes a cylinder liner and a liner seal.
Installed on Cummins 6C/L Series, ISC 8.3/L, QSC 8.3/L, ISL 8.9/9, and QSL 8.9 engines.
Generally manufactured up to 1990 / before the 1991 block modifications. To avoid errors, I recommend verifying at least one of the following: Engine Serial Number (ESN), CPL, Cummins QuickServe catalog, block casting number, engine production year, original cylinder liner dimensions, and the number stamped on the old cylinder liner. In particular, it is important to distinguish the early pre-1991 block from later versions.
The cylinder liner forms the cylindrical surface along which the piston and piston rings slide. It maintains the correct geometry of the cylinder, transfers heat to the engine block, and allows the engine to be rebuilt without having to replace the entire engine block. It is specified as a flanged cylinder liner and is supplied without sealing rings.
Cummins 6C-Series engines are also used in power plants, including the ISC 8.3, QSC 8.3, ISL 8.9 / 9, and QSL 8.9 / 9 models.
ESN – Engine Serial Number, CPL, Cummins QuickServe/OEM catalog, complete engine model and CM, stamped/cast number on the old liner, dimensional comparison of inner diameter/flange/length, or confirmation from Cummins.
The kit is installed inside the engine block. The cylinder liner fits into the block’s bore; inside the liner, the piston, piston pin, connecting rod, and crankshaft operate. It forms the thermal assembly of the individual cylinder and must contain combustion pressure, guide the piston, ensure compression sealing, control the oil film via the piston rings, and maintain the correct piston-to-liner clearance. The complete Cummins cylinder kit for engines in the C Series 8.3 L family, or industrial/on-highway/off-highway applications using the correct 8.3 L block configuration, with STD configuration, for the late thick-walled cylinder block #3934899, effective 01/05/1998.
It is used in Cummins 6C 8.3 L, 6CT 8.3 L, 6CTA 8.3 L, ISC 8.3, QSC 8.3, ISL 8.9/9, and QSL 8.9/9 engines.
Compatibility varies by engine CPL, ESN, piston configuration, and cylinder block. Verify the engine serial number before ordering. This wording allows you to correctly include QSL, ISL, QSC, and ISC without incorrectly stating that it fits all of these engines. Cummins itself recommends identifying parts by ESN/CPL and piston configuration.
Main Bearing Set – .25MMCummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Main Bearing Set – .50MM Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Main Bearing Set – STD Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Marine Exhaust Manifold for Cummins Engine 6CT & CTA
Oil Cooler Core Inner Gasket Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Oil Cooler Cummins Engine 6C 8.3-Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Oil Cooler Gasket Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Oil Cooler Gasket Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
The same Series C family can utilize different bowls depending on the application—road, industrial, or marine—or the position of the sump.
The ESN remains the most important check,
because the same engine model can be fitted with different
parts depending on the year of manufacture or the CPL.
Oil Pump Cummins Engine 6C 8.3 -Cummins Engine 6CT 8.3 -Cummins Engine 6CTA 8.3
The kit provides a seal at the rear of the crankshaft, preventing engine oil from leaking at the point where the crankshaft exits the engine block toward the flywheel/transmission housing. It is therefore installed at the rear of the engine block, on the flywheel side. The sealing component is typically made of a technical elastomer that is resistant to oil and high temperatures, combined with metal support/reinforcement elements.
Compatible engines: 4B, 4BT, 6B, 6BT, 6C, 6CT, 6CTA, ISB, QSB, ISC, QSC, ISL, QSL
However, we recommend checking the ESN/CPL before the sale: not all configurations within the same engine family necessarily use the same oil seal.
The kit is fitted to the front of the crankshaft, at the front gear housing/front cover. Its main function is to prevent engine oil from leaking around the crankshaft whilst it is rotating. The oil seal is normally made of an oil- and heat-resistant elastomer with a metal support ring.
Used on the 6C 8.3, 6CT 8.3, 6CTA 8.3, ISC 8.3, QSC 8.3, ISL, QSL / QSL 9 engines.
Final compatibility must always be checked using the engine’s ESN and CPL, or the Cummins OEM catalogue. Within the QSL family, there may be variations depending on the year, configuration and CPL; therefore, the engine family alone does not guarantee 100% suitability.
Front end of the crankshaft, pulley/damper side. Prevents engine oil from leaking around the front end of the crankshaft. Oil-resistant NBR nitrile rubber, metal reinforcement, and hardened steel wear sleeve. The kit includes an oil seal, wear sleeve, and dust shield.
Documented applications for Cummins 6C / 6CT 8.3, 6CTA 8.3, ISC 8.3, QSC 8.3, ISL 8.9, and QSL 8.9 / QSL 9 engines.
We recommend always checking the ESN and CPL, because Cummins may use different front oil seal configurations depending on the series, model year, and engine configuration.
Oil Seal Kit Rear Cummins Engine 6C.83-Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
Piston Cooling Nozzle Cummins Engine 6CT 8.3
Piston w/Retainer & Rings – ST Cummins Engine 6C.83-Engine 6CT.83-Engine 6CTA.83
Engines with CPL numbers:604, 754, 755, 830, 831, 393, 959, 982, 984, 1212, 1222, 1270, 1273, 1321, 1377, 1419, 1612, 1633, 1639, 1903, 2058.
.Included :
• Piston
• Piston pin
• Piston pin retainer
• Piston ring set
Piston w/Retainer & Rings – ST Cummins Engine 6C.83-Engine 6CT.83-Engine 6CTA.83
Engines with CPL numbers:8159, 8220, 8430, 8494, 8535, 8536, 8537, 8538, 8539, 8569, 8570, 8626, 8627, 8630, 8631, 8632, 8633, 8634, 8635, 8636, 8637, 8639, 8692, 8697, 8698, 8728, 8729, 8730, 8745, 8746.
.Included :
• Piston
• Piston pin
• Piston pin retainer
• Piston ring set
Piston w/Retainer & Rings – ST Cummins Engine 6C.83-Engine 6CT.83-Engine 6CTA.83
Engines with CPL numbers: 602, 603, 753, 819, 828, 955, 985, 1248, 1274, 1275, 1281, 1356, 1464, 1661, 1988, 2035, 2161, 2162, 2182, 2183, 2284, 2285, 2343, 2344, 2406, 2407, 2408, 2409, 2410, 2411, 2413, 2544, 2545, 2620.
Included :
• Piston
• Piston pin
• Piston pin retainer
• Piston ring set
Piston w/Retainer & Rings – STD- Cummins Engine 6C.83-Engine 6CT.83-Engine 6CTA.83 Cummins Engine L10
Engines with CPL numbers: 393, 604, 754, 755, 830, 831, 893, 959, 982, 984, 1212, 1222, 1270, 1273, 1321, 1377, 1419, 1612, 1633, 1639, 1903, 2058.
Included :
• Piston
• Piston pin
• Piston pin retainer
• Piston ring set
Rear Cover Gasket Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
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.
Ring Set, Single Cylinder – ST Cummins Engine 6C 8.3- Cummins Engine 6CT 8.3-Cummins Engine 6CTA 8.3
This is a set of piston rings. They perform three essential functions: they seal the combustion pressure between the piston and the cylinder, control the oil film on the cylinder wall, and help transfer heat from the piston to the cylinder.
Used on Cummins C Series, ISC 8.3, QSC 8.3, ISL, and QSL/QSL9 engines.
For QSL/ISL/ISC/QSC, it’s always a good idea to check the ESN and CPL, because the same engine may use different pistons and ring configurations depending on the version and model year.
The bushing is pressed into the connecting rod foot and forms the sliding surface between the connecting rod and the piston pin. It serves to maintain proper piston alignment, reduce friction and wear, and distribute the loads transmitted from the piston pin to the connecting rod. Some aftermarket versions require boring or finishing after installation to achieve the correct pin tolerance.
It is used in various Cummins applications in the C, ISC, ISL, QSC, and QSL families.
Final compatibility must be verified using the ESN (Engine Serial Number), CPL, and the QuickServe/Cummins parts catalog, because not all configurations of the same engine necessarily use the same connecting rod or bushing.
transfers combustion force from the piston to the crankshaft, converting piston reciprocating motion into crankshaft rotation.
For Cummins 6C 8.3, 6CT 8.3, 6CTA 8.3, ISC 8.3, and ISL 8.9 / 9 engines. Some aftermarket catalogs also extend the application to QSC 8.3 and QSL 9 Marine / Industrial engines.
Always verify compatibility using the Engine Serial Number (ESN), CPL, and the original connecting rod number before installation.
Secures the connecting rod cap to the connecting rod, ensuring proper tightening around the crankshaft journal. M12 × 1.25 thread. High-strength steel. Grade: 12.9.
Used on 6C / 6CT 8.3, 6CTA 8.3, ISC 8.3, and QSC 8.3 motors, as well as certain ISL, QSL, and M11 applications.
To ensure full compatibility, I recommend checking the ESN (Engine Serial Number), CPL, and connecting rod number, because there may be different configurations within the ISC/ISL/QSC/QSL/M11 family.
It is a connecting rod bolt nut used to secure the connecting rod cap to the connecting rod body. It holds the connecting rod bolt—and thus the connecting rod cap—tightly in place on the crankshaft; it is a critical component of the connecting rod assembly.
Used on 6C / 6CT 8.3, 6CTA 8.3, ISC 8.3, and QSC 8.3 motors, as well as certain ISL, QSL, and M11 applications.
However, this must be verified using the ESN (Engine Serial Number), CPL, and the QuickServe catalog before placing the order.
It is installed between the connecting rod head and the crankshaft connecting rod journal. It creates a lubricated sliding surface that reduces friction and wear and maintains the proper clearance between the connecting rod and the crankshaft. It is used when the crankshaft connecting rod journal has been ground down by 0.010″.
Replacement parts for Cummins C / ISC / QSC / ISL / QSL applications.
Before the sale, it’s a good idea to check the ESN, CPL, and the actual length of the crankshaft.
It is installed between the connecting rod head and the crankshaft connecting rod journal. It creates a lubricated sliding surface that reduces friction and wear and maintains the proper clearance between the connecting rod and the crankshaft. It is used when the crankshaft connecting rod journal has been ground down by 0.030″.
Replacement parts for Cummins C / ISC / QSC / ISL / QSL applications.
Before the sale, it’s a good idea to check the ESN, CPL, and the actual length of the crankshaft.
It is installed between the connecting rod head and the crankshaft connecting rod journal. It creates a lubricated sliding surface that reduces friction and wear and maintains the proper clearance between the connecting rod and the crankshaft. It is used when the crankshaft connecting rod journal has been ground down by 0.040″.
Replacement parts for Cummins C / ISC / QSC / ISL / QSL applications.
Before the sale, it’s a good idea to check the ESN, CPL, and the actual length of the crankshaft.
Il Cummins 3901969 è un Expansion Plug / Camshaft Bore Plug / Block Expansion Plug, cioè un tappo di espansione del blocco, utilizzato in particolare per chiudere il foro posteriore dell’albero a camme (Rear Cam Bore). Cummins lo cataloga come Expansion Plug.
The documented applications primarily include this part for the following engines: Cummins C Series / 6C 8.3, 6CT 8.3 / 6CTA 8.3, ISC 8.3, QSC 8.3, ISL 8.9, QSL 8.9 / QSL9.
Before considering them 100% interchangeable, I still recommend verifying them using the ESN (Engine Serial Number), CPL, and QuickServe, because their application may vary depending on the engine configuration.
It seals the rear opening of the camshaft housing, preventing engine oil leaks. An aftermarket catalog also refers to it as the camshaft plug O-ring.
For engines in the C, ISC, QSC, ISL, and QSL families; Cummins specifically lists ISC/ISL 8.9 L Tier 3 applications.
Before considering them 100% interchangeable, I still recommend verifying them using the ESN (Engine Serial Number), CPL, and QuickServe, because their application may vary depending on the engine configuration.
The rocker arm is part of the valve train. It receives motion from the camshaft via the rocker arm and pushrod and transfers it to the valves, enabling the intake and exhaust valves to open and close properly. It thus maintains proper synchronization between the valve train and cylinder operation.
Compatible Engines: Cummins 6C 8.3, 6CT 8.3, 6CTA 8.3, ISC 8.3, QSC 8.3, ISL 8.9, QSL9.
However, I recommend checking the ESN (Engine Serial Number), CPL, and engine configuration, because within the 6C family, there may be different rocker arm variants depending on the model year and cylinder head configuration.
A rocker arm shaft designed to transfer the rocker arm’s motion to the rocker, ensuring proper operation of the engine’s intake and exhaust valves.
Cummins C Series 8.3 L engines, including the 6C, 6CT, 6CTA, and C8.3. Cummins specifically notes that these are primarily intended for use on non-certified C 8.3 L engines; additionally, aftermarket applications include ISC, QSC, ISL, and QSL engines,
Before considering them 100% interchangeable, I still recommend verifying them using the ESN (Engine Serial Number), CPL, and QuickServe, because their application may vary depending on the engine configuration.
It keeps the rocker arm properly guided and aligned during the movement generated by the camshaft, contributing to the proper operation of the valve train.
Per motori Cummins ISC, ISL; altre fonti aftermarket lo associano anche a QSC/QSL e alla famiglia 6C 8.3L.
Before considering them 100% interchangeable, I still recommend verifying them using the ESN (Engine Serial Number), CPL, and QuickServe, because their application may vary depending on the engine configuration.
Seal – Rocker Lever Cover Cummins Engine 6CT 8.3-Cummins Engine 6CT 8.3