Cummins 6CT Engine Parts Catalog – Rebuild Kits by CPL Number

Engine Overview: Cummins 6CT

The Cummins 6CT engine is a heavy-duty, inline six-cylinder diesel platform designed for commercial-grade applications including industrial, construction, agricultural, and marine use. With a displacement of 8.3 liters and a proven track record for durability and performance, the 6CT is known for long service life and ease of maintenance. Rebuilds using quality kits help extend the engine’s lifespan while maintaining OEM-level efficiency.

At Diesel Pro Power, we’ve supplied Cummins rebuild kits to over 40,000 satisfied customers around the world. Our kits are CPL-specific, ensuring each kit includes the correct piston type, gasket sets, and internal components needed for your exact engine variant.

Complete Rebuild Kits for Cummins 6CT Engines

Each overhaul kit includes:

• Pistons (one-piece, standard size)

• Piston rings

• Cylinder liners

• Connecting rod bearings

• Main bearings

• Thrust washers

• Upper gasket set

• Lower gasket set

These kits are categorized by CPL (Control Parts List) number to ensure 100% compatibility.

Cummins 6CT Rebuild Kits – CPL Compatibility

Kit for 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

• Piston Type: One-piece

• Compression Ratio: Typically 17.0:1

• Application: Designed for stationary industrial units and older construction equipment. Provides consistent torque and reliability across a wide RPM range.

Kit for 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

• Piston Type: One-piece

• Compression Ratio: Generally 16.5:1

• Application: Common in equipment with medium-duty cycles such as tractors, sprayers, loaders, and generators.

Kit for CPLs:

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

• Piston Type: One-piece

• Compression Ratio: Typically 17.3:1

• Application: Found in high-torque applications including agriculture and industrial machines requiring more low-end power.

Kit for 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

• Piston Type: One-piece

• Compression Ratio: Ranges from 16.5:1 to 17.5:1

• Application: Often used in marine, forestry, and specialty equipment with variable RPM demands.

Kit for CPLs:

2241, 2299, 2964, 8578

• Piston Type: One-piece

• Compression Ratio: 17.5:1

• Application: For turbocharged variants of the 6CTA, optimized for high-output scenarios in off-road and marine sectors.

Supporting Components for Cummins 6CT Rebuilds

A full overhaul should always include inspection and potential replacement of related wear items. Below is a breakdown of high-demand components compatible with Cummins 6CT, 6CTA, ISC, and QSC engines.

Piston Cooling Nozzles

• Available in 1.22-inch and 1.73-inch lengths

• Six required per engine

• Ensure proper oil flow to the underside of the piston for temperature control

Crankshaft Seal Kits

• Front and rear kits include seal and sleeve

• Available for both dry clutch and wet clutch housings

• Prevent post-rebuild oil leakage at crankshaft exit points

Expansion Plug Kits

• Includes all freeze plugs needed for the cylinder block

• Required for complete coolant system integrity during rebuild

Turbo Mounting & Exhaust Gaskets

• Turbo mounting gasket for water-cooled turbo setups

• Exhaust outlet gasket for sealing the manifold to exhaust piping

Fuel and Oil Filtration Components

Replacing all filters during a rebuild is critical for protecting the engine during break-in.

Fuel Filters

• Available in multiple diameters and thread configurations

• Compatible with standard and high-capacity fuel systems

Fuel Filter and Water Separator

• Helps prevent corrosion and injector damage

• Essential for marine and high-humidity environments

Oil Filters

• Spin-on style

• Should be replaced along with the first oil change after break-in

Recommended Tools for Engine Service

Feeler Gauge Set

• Range: .002" to .025"

• Used to adjust valve lash to OEM specifications post-rebuild

Piston Ring Assembly Tool

• Compatible with 6CT and other Cummins/Detroit platforms

• Prevents ring distortion and piston scoring during installation

Filter Wrenches

• Fuel filter and oil filter wrenches available for multiple sizes

• Prevent housing damage during removal

Additional Components for Long-Term Operation

Vibration Isolators

• Four required per engine

• Dampen vibration, reduce frame stress, and improve longevity

Temperature Switch

• Activates at 205°F

• 1/2" NPT thread

• Ideal for triggering alarms or shutdowns in overheat conditions

Monitoring Systems: Gauges and Instrumentation

Post-rebuild engine health should be monitored continuously using:

• Mechanical gauges for oil pressure and coolant temperature

• Electrical gauges (12V or 24V) with or without integrated alarms

• Panel-ready gauges compatible with marine and stationary setups

Why Diesel Pro Power?

• Over 40,000 customers served

• Fast worldwide shipping

• CPL-matched kits for precision and performance

• Technical support available for installation and setup

Whether you're rebuilding a Cummins 6CT for industrial, agricultural, or marine use, Diesel Pro Power provides everything needed to complete the job the right way — the first time.