Cummins ISB 6.7 Parts for Australia - Piston Kit Section

Piston Kits for Cummins ISB 6.7 Engines

The Cummins ISB 6.7 engine is known for its durability and fuel-efficient performance in a wide range of applications—from industrial equipment to commercial marine propulsion. Over time, even the most reliable engines require internal rebuilds. Whether you're performing a top-end refresh or a full in-frame overhaul, replacing your pistons is one of the most critical steps to restoring compression, fuel efficiency, and long-term reliability.

At Diesel Pro Power, we supply premium piston kits engineered to match factory specifications for the Cummins ISB 6.7 engine. These kits are compatible with both ISB and QSB series platforms and are designed for fast, direct-fit installation.

What’s Included in Our Cummins ISB 6.7 Piston Kits?

Each piston kit is carefully matched to the correct bore size and includes:

• One-piece aluminum alloy piston (cast or forged depending on CPL)

• Pre-installed wrist pin (also known as the piston pin or gudgeon pin)

• High-performance compression and oil control rings

• Retaining clips

• Optional cylinder liner when required by CPL

These components are manufactured to strict tolerances and undergo rigorous quality control testing to ensure proper combustion chamber sealing and minimal friction under load.

Compatibility Across CPL Configurations

Cummins engines use CPL (Control Parts List) numbers to define compatible internal configurations. We offer piston kits to fit a wide range of CPLs commonly found in ISB 6.7 builds. Whether your engine is configured for industrial, power generation, or marine duty, we can match you with the correct piston components.

If you're unsure of your CPL, you can find it stamped on your engine dataplate. Our piston kits are available for configurations that include low-emission, cooled EGR, non-EGR, and aftertreatment variants.

Standard Bore Sizes and Optional Overbore Sizes

Most ISB 6.7 piston kits are designed for standard bore diameter. However, if your engine block has been honed or bored during service, we also offer oversize piston kits and matching ring sets. Common overbore sizes include 0.50 mm and 1.00 mm increments.

Always confirm the cylinder bore size using precision measurement tools before ordering a replacement piston.

Piston Ring Sets for Cummins ISB 6.7

Replacing just the piston rings? Diesel Pro Power stocks individual ring sets compatible with both our one-piece piston kits and OE configurations. Each ring set is designed to match the specific compression ratio and ring groove profile of the piston it was designed for.

What’s Included in Each Ring Set?

Each piston ring set typically includes:

• Two compression rings (top and second groove)

• One oil control ring (multi-piece or single-piece design depending on CPL)

• Anti-wear coatings for long service life

• Consistent radial pressure for oil scraping and compression sealing

Ring sets should always be replaced during overhaul and should not be reused—even if the piston itself is being retained.

Cylinder Liners for ISB 6.7 Rebuilds

Some engine configurations include replaceable cylinder liners (also called sleeves), especially when installed in high-duty or salvageable applications. These liners restore the bore surface and help eliminate the need for complete block replacement in the event of scoring, pitting, or wear.

Types of Liners Available:

• Dry liners: Sit directly in the block and are cooled via surrounding coolant jackets

• Salvage liners: Designed to recover blocks that have experienced bore damage

Before purchasing, confirm whether your specific CPL uses wet, dry, or salvage liners—or if the block must be bored directly.

Key Benefits of Replacing Pistons and Liners

Rebuilding your Cummins ISB 6.7 engine with new pistons, rings, and liners offers numerous benefits:

• Restores compression: Ensures consistent power and fuel economy

• Reduces oil consumption: Worn pistons or rings can lead to blow-by and increased oil use

• Prevents future failures: Catching ring wear or piston skirt damage early avoids deeper issues

• Improves emissions compliance: A proper combustion seal ensures optimal performance for aftertreatment systems

Tips for Successful Piston Kit Installation

• Inspect cylinder bores: Check for scoring, taper, or out-of-round before installing new pistons or liners.

• Check ring end gap: Always verify piston ring end gap during assembly.

• Match to your CPL: Ensure the piston crown design, compression height, and pin offset match your engine build.

• Use proper lubrication: Coat piston skirts and rings with clean engine oil or assembly lube during installation.

• Torque properly: Always follow factory torque specifications for connecting rod bolts and liner protrusion (if applicable).

Additional Tools You May Need

When rebuilding the piston assembly on a Cummins ISB 6.7 engine, consider the following tools:

• Piston ring compressor: For smooth installation of pistons into the bore

• Feeler gauge set: For checking ring end gaps and piston-to-liner clearance

• Micrometer and bore gauge: To confirm bore diameter before selecting piston size

• Dial indicator: Useful for measuring liner protrusion or piston deck height

Why Choose Diesel Pro Power for Your Piston Kits?

With over 40,000 satisfied customers worldwide, Diesel Pro Power is a trusted source for Cummins engine parts. Our piston kits are shipped fast, backed by expert support, and designed to fit right the first time. We carry components for every major CPL variant of the ISB 6.7 and can help you select the right setup for your rebuild.