Cummins ISC Engine Parts – Gasket Section

The Cummins ISC is a widely used mid-range engine powering marine vessels, industrial machinery, and heavy-duty equipment worldwide. To maintain proper sealing and efficiency, gasket sets and sealing compounds are critical. A failed gasket can lead to coolant leaks, oil loss, reduced compression, or exhaust leaks—issues that compromise both performance and reliability.

This gasket catalog covers the most essential sealing solutions for Cummins ISC engines, along with compatible QSC, ISL, QSL, and related models. Diesel Pro Power supplies only premium-quality gasket sets and sealing materials, trusted by over 40,000 satisfied customers globally.

Upper Gasket Sets for Cummins ISC

Upper gasket sets are designed for cylinder head and top-end repairs. They contain all major gaskets and seals needed when removing or overhauling the head assembly.

ISC Upper Gasket Set for CM554, CAPS Fuel System

Designed for ISC engines with the CAPS electronic fuel system, this kit ensures tight sealing of the cylinder head, intake, and exhaust components. It prevents compression leaks and protects against oil or coolant seepage.

ISC Upper Gasket Set for CM850, HPCR Fuel System

High-Pressure Common Rail (HPCR) engines require advanced sealing due to higher fuel pressures. This set includes reinforced head gaskets, intake manifold gaskets, and valve cover gaskets engineered for HPCR-equipped ISC engines.

ISC Upper Gasket Set for EGR Engines

Exhaust Gas Recirculation (EGR) models run at higher thermal loads. This gasket set is built with enhanced materials to withstand the extreme heat cycling of EGR systems, ensuring longevity under demanding operating conditions.

Lower Gasket Sets for Cummins ISC

Lower gasket sets are required when servicing the oil pan, crankshaft seals, or lower-end components.

• ISC Lower Gasket Set – Includes oil pan gaskets, front and rear cover gaskets, and seals for lower block assembly. Essential for major rebuilds or oil leak repairs.

Cylinder Head & Exhaust Gaskets

Exhaust Manifold Outlet Connection Gasket

A critical sealing surface between the exhaust manifold and outlet connection. Prevents exhaust leaks that reduce turbocharger efficiency and cause harmful fumes in the engine bay.

Intake Manifold Cover Gaskets

Two variants are available for the ISC:

• Standard intake cover gasket for general applications.

• Heavy-duty intake cover gasket for QSC and ISC engines requiring additional durability.

These gaskets ensure a leak-free seal at the intake manifold cover, maintaining proper air pressure balance for combustion.

Gear Housing Gasket

Seals the gear housing against the engine block, preventing oil leaks around the timing gear assembly. Proper sealing in this area is essential for maintaining lubrication integrity.

Intake Connection Gasket

Used on ISC, QSC, and related engines, this gasket seals the intake pipe connection to the manifold. It ensures no air loss, which is critical for turbocharged engines.

Rear Cover Gasket

Seals the rear housing cover on ISC, QSC, ISL, and QSL engines. Prevents oil leaks in an area that is difficult to access once the engine is installed.

Fuel & Oil System Gaskets

Fuel Transfer Pump Gasket

Each fuel pump requires two gaskets for proper sealing. These ensure no air intrusion or fuel leakage, protecting injection system performance.

Oil Cooler Cover Gaskets

Two versions are available for ISC applications:

• Standard cover gasket for the external oil cooler.

• Inner oil cooler cover gasket for additional sealing protection.

These prevent coolant and oil cross-contamination, one of the most common causes of engine damage if gaskets fail.

Marine Raw Water Pump O-Rings

The Cummins ISC marine configuration uses raw water pumps to cool the engine in marine environments. Each pump requires O-rings for inlet and outlet sealing.

• Two O-rings per engine are recommended for proper operation.

• They prevent seawater leaks that could compromise the cooling system.

Sealants, Gasket Makers & Threadlockers

In addition to pre-formed gaskets, liquid sealants and compounds are often required during ISC maintenance. Diesel Pro Power carries a full line of compatible sealing products.

High-Temperature Jointing Compound

Designed for use on Cummins and Detroit Diesel turbochargers, this sealant withstands temperatures between 550°C and 760°C, ensuring leak-free performance in extreme environments.

Gasket Sprays & Sealants

• High-Tack Gasket Spray – Holds cut gaskets in place during assembly, while also sealing small imperfections.

• 3H Liquid Sealant – Flexible liquid sealant for irregular mating surfaces.

• Threadlocker (Red, High Strength) – Locks threaded fasteners permanently, preventing loosening under vibration.

RTV Silicone Gasket Makers

• Sensor-Safe Blue RTV – Will not damage oxygen or pressure sensors.

• High-Temperature RTV – Withstands extreme thermal cycling.

• Ultra Blue RTV Silicone – A versatile, sensor-safe option.

• Non-Hardening Pliable Sealant – Remains flexible, useful for applications requiring disassembly.

J-B Weld Cold Weld

A two-part epoxy used as a cold weld repair for metal surfaces. Excellent for emergency repairs where gasket replacement is not immediately possible.

Why Quality Gaskets Matter in Cummins ISC Engines

The Cummins ISC is a high-performance diesel platform where precise sealing is essential for:

• Maintaining compression ratios.

• Preventing oil and coolant leaks.

• Reducing maintenance downtime.

• Extending overall engine life.

Inferior gaskets or sealants can fail under high heat and pressure, leading to catastrophic engine damage. That’s why Diesel Pro Power only offers premium OEM-quality gaskets and sealing solutions.