Cummins QSL Engine Parts – Piston Kits Catalog

The Cummins QSL engine is a reliable, heavy-duty diesel engine widely used in industrial, marine, and power generation applications. When it comes to maintaining or rebuilding these engines, quality piston kits are essential for restoring original performance and reliability. At Diesel Pro Power, we supply premium QSL piston kits and components that meet or exceed OEM specifications—trusted by over 40,000 satisfied customers worldwide.

This catalog page covers piston kits, cylinder liners, piston rings, and liner seals designed specifically for the Cummins QSL engine family. Whether you're conducting a full engine overhaul or replacing worn internal parts, you’ll find high-quality, application-specific components right here.

Engine Overview: Cummins QSL Platform

The Cummins QSL series is part of the broader ISC/ISL/QSC/QSL family, built for performance and durability in rugged operating conditions. With displacements ranging from 8.3 to 9.0 liters, the QSL is especially popular in industrial and off-highway use thanks to its high torque output and compact packaging.

Common Applications:

• Excavators

• Agricultural machinery

• Generators

• Marine auxiliary systems

• Drilling equipment

• Industrial pumping systems

Key features of the QSL engine include:

• High-pressure common rail fuel system

• Cast iron block with wet liners

• Low-emissions architecture

• High-strength pistons and rings designed for extended duty cycles

The components listed below are designed for direct compatibility with QSL engine models identified by their CPL (Control Parts List) numbers.

Piston Kits for Cummins QSL Engines

1. 2-Piece Piston Kit for ISL and QSL Engines

For CPLs: 1096, 2701, 2736

This piston kit includes a 2-piece articulated piston design commonly found in high-load QSL engine applications. It includes the piston body and the crown, along with the piston pin for easy assembly. These pistons are engineered for enhanced thermal performance, reducing risk of crown cracking or skirt collapse in demanding service conditions.

Key Features:

• 2-piece articulated design for increased strength and durability

• Compatible with ISL and QSL engines

• Includes piston pin

• Designed to match OEM compression and fitment specifications

This kit is often selected for QSL engines in generator and stationary engine applications, where durability under long duty cycles is crucial.

2. 2-Piece Piston Kit for QSL Engines

For CPLs: 388, 1286, 1480, 1793, 1861, 1978, 1979, 1980, 2176, 2724, 3079, 3158, 3211, 3212, 3312, 3435, 3630, 4159, 4254, 4805, 8419, 8600, 8703

This piston kit features a durable 2-piece configuration that includes a forged steel crown and aluminum skirt for thermal stability and reduced weight. Ideal for both new builds and overhauls, this piston set offers excellent resistance to scuffing and piston slap, even in high-load cycles.

Specifications:

• Forged steel crown mated with aluminum skirt

• Includes piston pin

• Balanced for vibration reduction

• Ideal for high-torque QSL industrial and off-road engines

This piston kit is commonly used in large construction machinery and earthmovers, where QSL engines operate at peak loads and require robust piston architecture.

Cylinder Liners for QSL Engines

3. Standard Cylinder Liner

Dimensions:

• Sleeve height: 9 1/4 inches

• Flange diameter: 5.12 inches (130 mm)

Standard wet cylinder liners are a vital part of the QSL engine’s serviceable architecture. These liners allow easy rebuilds without boring the block and ensure that cylinder wear does not compromise the crankcase structure.

Features:

• OEM-equivalent material for long-term durability

• Machined to exacting tolerances for secure block seating

• High compatibility with Diesel Pro’s piston kits

• Standard bore sizing—ready for direct installation

Whether you're rebuilding a single cylinder or doing a full in-frame overhaul, replacing the liners ensures proper sealing, compression, and oil control across all cylinders.

Piston Ring Sets for QSL Engines

4. Piston Ring Set for ISC, QSC, ISL, and QSL Engines

Each piston ring set is sold per piston and contains all rings needed for one full assembly. These rings are manufactured to OEM standards and provide excellent oil control, gas sealing, and wear resistance.

Included:

• Compression rings

• Intermediate rings

• Oil control rings

These rings are plasma-coated or moly-filled where required, matching Cummins specifications for longevity and wear reduction. A proper ring seal is essential for maintaining combustion efficiency and minimizing oil consumption, especially in marine and high-speed industrial engines.

Liner Seals for QSL Cylinder Liners

5. Liner Seal, Rectangular Style

Used per liner, these rectangular liner seals are placed at the base of each cylinder sleeve to ensure a watertight seal between the liner and engine block coolant passages.

Benefits:

• Maintains pressure seal between coolant jacket and combustion liner

• Prevents internal coolant leaks

• High-temperature and chemical-resistant materials

When installing new cylinder sleeves, always replace the liner seals to prevent leaks and avoid potential head gasket failure or combustion contamination.

Why Choose Diesel Pro Power for QSL Piston Kits?

40,000+ Satisfied Customers Trust Diesel Pro Power

Diesel Pro Power offers unmatched customer service, fast worldwide shipping, and precision-engineered engine parts. When you shop for QSL piston kits here, you get:

• Expert support for CPL compatibility

• All parts in stock and ready to ship

• Clear documentation and bilingual product details

• Trusted by operators, mechanics, and engineers globally

We understand the urgency of getting industrial equipment back online. That’s why every kit we sell is inspected for quality and packaged with care.

Important Considerations When Replacing QSL Pistons

1. CPL Compatibility

Each Cummins engine has a unique CPL number that determines its parts compatibility. Before ordering piston kits, confirm the CPL on your engine’s dataplate and match it to our listings to avoid installation issues.

2. Compression Ratios and Piston Types

Not all QSL piston kits are the same. Some use 2-piece articulated pistons for high-strength applications, while others use monoblock designs. Choosing the correct type ensures optimal compression and prevents balance issues.

3. Matching Piston Rings and Liners

Replacing pistons without matching rings or sleeves often leads to premature failure. We recommend replacing the full set—pistons, liners, rings, and seals—for balanced engine wear and consistent performance.

Common Signs You Need New QSL Pistons or Liners

• Excessive blow-by or oil consumption

• Low compression readings

• Coolant or oil leaks from cylinder sleeve base

• Scoring or damage on piston skirts or crowns

• Increased exhaust smoke (especially under load)

If any of these symptoms appear, your QSL engine may require an in-frame overhaul using our full piston rebuild kits.

Complete QSL In-Frame Rebuild Strategy

To fully overhaul your Cummins QSL top-end and bottom-end, we recommend the following components in tandem with piston kits:

Top-End:

• Cylinder Head (new or remanufactured)

• Valve Train Kits

• Head Gasket Sets

• Rocker Arms and Pushrods

Bottom-End:

• Piston Kits (with pins)

• Cylinder Liners

• Ring Sets

• Liner Seal Rings

• Main and Rod Bearings

• Lower Gasket Sets

This holistic approach ensures all critical systems are restored during the rebuild and minimizes future downtime.