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Cummins 6C Engine Parts - Rebuild Kit Section

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Cummins 6C Engine Rebuild Kits and Components Catalog

The Cummins 6C engine platform—including the 6C, 6CT, and 6CTA variants—is a cornerstone of mid-range diesel performance. Found in applications ranging from marine propulsion to heavy equipment and industrial generators, the 6C8.3L engine is known for its reliability, power density, and long service life.

When the time comes to overhaul your Cummins 6C engine, choosing the right rebuild kit is critical to regaining compression, restoring oil control, and ensuring long-term performance. At Diesel Pro, we carry complete in-frame overhaul kits and essential support components for nearly every major CPL (Control Parts List) configuration of the 6C, 6CT, and 6CTA engines.

Complete Overhaul Kits for Cummins 6C by CPL

Each rebuild kit includes:

  • One-piece pistons

  • Piston rings

  • Cylinder liners

  • Rod bearings

  • Main bearings

  • Thrust washers

  • Full gasket set (upper and lower)

  • Optional seals, depending on CPL and configuration

All components are designed to meet or exceed OEM specifications. Kits are matched to specific CPLs to ensure exact fitment across combustion chambers, liner bore sizes, and piston types.

Overhaul Kit for Cummins 6C / 6CT / 6CTA – CPLs:

602, 603, 753, 819, 828, 829, 942, 955, 985, 1248, 1274, 1275, 1281, 1356, 1464, 1603, 1616, 1661, 1988, 2035, 2161, 2162, 2182, 2183, 2284, 2285, 2343, 2344, 2406, 2407, 2408, 2409, 2410, 2411, 2413, 2544, 2545, 2620

This overhaul kit is compatible with some of the most widely used variants of the 6CTA platform, common in industrial pumps, stationary power units, and off-road vehicles. One-piece pistons included in this kit offer superior structural strength compared to articulated designs.

Compression Ratio: 17.0:1
Explanation: This standard diesel compression ratio is engineered for consistent combustion, even under heavy load. It strikes a balance between power, fuel economy, and cold-start reliability.

Overhaul Kit for Cummins 6C / 6CT / 6CTA – CPLs:

604, 605, 754, 755, 830, 831, 890, 892, 893, 959, 982, 984, 1212, 1222, 1269, 1270, 1273, 1321, 1377, 1419, 1539, 1547, 1604, 1612, 1633, 1639, 1804, 1826, 1903, 2058, 2380, 8930

Designed for variants that see diverse applications—from agriculture to transit—this kit includes the same forged, one-piece pistons and hardened steel rings for extended durability in variable duty cycles.

Compression Ratio: 16.5–17.0:1
Explanation: Lower compression ratios are often selected for engines with higher turbo boost levels or tighter emissions requirements. These ratios help reduce peak cylinder pressure and temperature, which enhances turbo life and reduces NOx formation.

Overhaul Kit for Cummins 6C / 6CT / 6CTA – CPLs:

1216, 1217, 1221, 1282, 1366, 2172, 2960, 8089

This kit supports a specialized group of high-load industrial engines used in material handling, forestry equipment, and power generation. Piston crowns are anodized for heat resistance in applications with extended run times.

Compression Ratio: 17.3:1
Explanation: A slightly higher compression ratio boosts torque and aids cold starting, especially useful in colder climates or when engines operate at low RPM under continuous load.

Overhaul Kit for Cummins 6C / 6CT / 6CTA – CPLs:

1845, 1846, 1943, 2007, 2054, 2055, 2056, 2057, 2060, 2061, 2062, 2082, 2118, 2120, 2185, 2216, 2217, 2218, 2219, 2250, 2549, 2556, 2642, 2833, 2873, 2874, 2894, 2951, 3332, 8000, 8222, 8289, 8290, 8388, 8509, 8759

Engineered for a wide range of industrial and marine setups, this kit includes hardened steel top rings for enhanced wear resistance under high-combustion conditions.

Compression Ratio: 17.5:1
Explanation: This high compression supports optimal atomization and combustion efficiency, ideal for engines that are not EGR-equipped or use traditional fuel mapping.

Overhaul Kit for Cummins 6C / 6CT / 6CTA – CPLs:

2241, 2299, 2964, 8578

This kit fits the newest generation of 6CTA variants, many of which serve as genset power units and marine propulsion systems. Its matched gaskets and bearings are designed for long-run-hour intervals.

Compression Ratio: 17.5:1
Explanation: A high compression ratio increases combustion speed and thermal efficiency, ensuring strong performance in high-load, steady-state applications such as continuous-duty generators.

Related Components and Tools for Cummins 6C Rebuilds

In addition to overhaul kits, Diesel Pro offers all the necessary supporting components to complete your rebuild right the first time.

Piston Cooling Nozzles

Oil nozzles are vital to prevent piston overheating during combustion. We offer two sizes for the Cummins 6C platform:

  • 1.22" long nozzles – For articulated piston setups

  • 1.73" long nozzles – For longer stroke or one-piece piston configurations

Each engine requires six piston cooling nozzles.

Crankshaft Seal Kits

Front Seal Kits:

Available with integrated sleeves and dust shields to ensure leak-free operation during crank rotation. Choose between standard and non-automotive configurations depending on CPL.

Rear Seal Kits:

Offered for both dry and wet clutch housing engines. Always replace rear main seals during rebuilds to avoid crankcase leaks post-installation.

Expansion Plug Kits

The expansion plug kit (also known as the freeze plug kit) includes all necessary press-fit plugs for the coolant passages in your 6C block. Replacing these during a rebuild helps avoid pressure leaks or cooling system failures down the line.

Fuel Filters & Water Separators

Restore clean fuel delivery with high-quality spin-on filters compatible with 6C8.3, 6CT, ISC, and QSC engines. Options include:

  • Standard spin-on filters

  • Large capacity filters

  • Fuel-water separators with integrated drain valves

Essential Tools for a Successful Rebuild

Additional Components for Long-Term Performance

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