Cummins ISC Engine Overhaul Kits – Parts Catalog by CPL Number

Heavy-Duty Support for Industrial and Commercial Cummins ISC Applications

The Cummins ISC engine is known for its mid-range power, durability, and fuel efficiency. Whether it's powering construction equipment, generators, or marine auxiliary applications, the ISC’s electronically controlled system delivers consistent output. Over time, like any high-performance engine, it will require a major overhaul to restore power, reduce oil consumption, and improve fuel economy.

At Diesel Pro Power, we offer premium overhaul kits for the Cummins ISC platform, fully compatible with specific CPL numbers to ensure correct fitment. With over 40,000 satisfied customers around the world, Diesel Pro Power is a name trusted for quality, availability, and fast shipping.

Engine Specifications & Applications

The Cummins ISC (Interact System Controlled) is an 8.3-liter, inline 6-cylinder engine widely used in:

• Industrial and commercial equipment

• Marine auxiliary units

• Construction equipment

• Agricultural machinery

• Fire and emergency vehicles

• Generators and stationary applications

This engine shares many base features with the 6CT and 6CTA, including bore and stroke dimensions of 4.49 x 5.32 inches, and a displacement of 8.3 liters. Unlike its mechanical predecessors, the ISC includes electronic fuel control (via CAPS or HPCR systems depending on CPL), offering enhanced fuel management and emissions control.

Overhaul kits vary depending on the engine’s CPL (Control Parts List) number, which reflects its configuration and emissions compliance. Always match the CPL when choosing an overhaul kit to ensure full compatibility.

Overhaul Kits for Cummins ISC by CPL Number

Each of the following kits includes components required for a full in-frame overhaul: cylinder kits (pistons, liners, rings), main bearings, rod bearings, thrust washers, head gasket set, and lower gasket set. Some kits may also include additional components depending on CPL configuration.

Overhaul Kit for Cummins ISC – Compatible with CPL #s:

8159, 8220, 8430, 8535, 8536, 8537, 8538, 8539, 8569, 8570, 8797, 8728, 8729, 8730, 8692, 8697, 8698

• One-piece piston configuration

• Standard compression ratio: 17.3:1

• This ratio is designed for fuel efficiency and strong torque output at lower RPMs, ideal for auxiliary marine engines and heavy-duty cycles

• Designed for engines with CAPS fuel system and rear gear train layouts

Overhaul Kit for Cummins ISC – Compatible with CPL #s:

2092, 2230, 2231, 2232, 2233, 2234, 2235, 2236, 2237, 2688, 2689, 2690, 2691, 2692, 2693, 2694, 2698, 2964

• One-piece piston configuration

• Standard compression ratio: 17.5:1

• Slightly higher compression improves cold-start performance and combustion efficiency

• Often found in generator sets and power units where emissions compliance is required

Note on Compression Ratios: A higher compression ratio typically leads to better thermal efficiency and more torque at lower RPMs. However, it also increases combustion temperature and pressure, which may require stricter maintenance intervals and higher-quality fuel.

Supporting Components for Cummins ISC Overhaul

In addition to full rebuild kits, Diesel Pro Power stocks related service parts to complete your overhaul and maintenance program.

Piston Cooling Nozzles

• For ISC engines with articulated or one-piece pistons

• Two standard lengths available: 1.22" and 1.73"

• Designed to spray oil onto the underside of the piston, preventing overheating and piston scuffing

• One nozzle required per cylinder

Front Crankshaft Seal Kits

• Includes both the seal and sleeve

• Available in configurations for marine/non-automotive applications

• Prevents oil leaks from the front crankshaft, a common issue during overhaul or reassembly

Rear Crankshaft Seal Kits

• Includes the seal and sleeve or dust shield (depending on configuration)

• Available for ISC engines with wet clutch housing or dry rear main seals

• Critical for protecting the flywheel housing from oil contamination

Common Filters for Cummins ISC Engines

Proper filtration is essential after engine overhaul. Fresh oil and fuel filters help protect new bearings, rings, and injectors during the break-in period.

Oil Filters for ISC Engines

• Spin-on type

• Multiple configurations depending on CPL and application (standard vs. high-capacity)

• Critical during initial hours after rebuild due to high debris shedding

Fuel Filters for ISC Engines

• Thread types vary: M16 x 1.5", 13/16"-18, 7/8"-14 UNF

• Available in standard or high-capacity

• Water separator filters also available for diesel fuel systems prone to condensation

Maintenance Tools for ISC Engine Overhaul

At Diesel Pro Power, we offer high-quality tools that support your rebuild process:

Feeler Gauge (.002" to .025")

• Used for setting valve lash

• Precision tool for mechanical inspection of rocker arms and pushrods

Piston Ring Assembly Tool

• Ensures safe installation of piston rings into liners

• Compatible with Cummins and Detroit Diesel pistons

Fuel Filter Wrench (3-7/16" to 3-3/4")

• Designed for removing spin-on fuel filters in tight locations

• Prevents damage to housing and threads

Oil Filter Wrench (4-21/32" to 5-5/32")

• Fits Cummins and Detroit Diesel oil filters

• Steel construction with non-slip grip

Related Components to Inspect During Overhaul

Temperature Switch

• Closes at 205°F

• Controls cooling fan or auxiliary alarm systems

• Compatible with Cummins, Detroit Diesel, and Caterpillar engines

Radiator Cleaner

• Removes scale and sludge from cooling passages

• Recommended before final coolant fill after overhaul

Gauges

• Mechanical and electrical gauges for monitoring oil pressure, coolant temperature, and system voltage

• 12V and 24V options available

• With or without alarms

Vibration Isolators

• ISC engines in generator or stationary platforms often rely on vibration isolation

• Replace all isolators during engine overhaul for best performance

Why Choose Diesel Pro Power for Cummins ISC Overhaul Kits?

• Exact CPL Match Guarantee: Our overhaul kits are grouped and matched by CPL number to ensure perfect fitment—no guessing or part returns.

• Global Reach: We ship worldwide with fast order processing and tracking.

• Trusted by Thousands: Over 40,000 satisfied customers rely on us for heavy-duty diesel engine parts.

• Expert Support: Our technical staff understands CPLs, fuel system types, and the differences between ISC and 6CTA platform engines.

Tips for a Successful ISC Engine Overhaul

• Always verify your CPL number before ordering.

• Check the condition of your camshaft and followers—ISC engines with high mileage may show cam wear before major failure.

• Consider upgrading cooling nozzles during overhaul to improve piston longevity.

• Use break-in oil during initial hours and replace filters early.