Rebuild Kit Catalog for Cummins Marine & Industrial Engines

Complete In-Frame Rebuild Kits for Every Cummins Engine Model

When your Cummins engine begins to show signs of wear—be it in a commercial vessel, recreational boat, power generator, or industrial application—a rebuild kit is often the most effective and affordable solution. At Diesel Pro Power, we provide in-frame rebuild kits that restore your engine’s performance, improve reliability, and reduce downtime, all without the cost of a full replacement.

Each Cummins rebuild kit includes essential components such as pistons, rings, liners, main bearings, rod bearings, and lower gaskets. These kits also function as full overhaul kits, providing the comprehensive parts required to complete an engine overhaul without removing the engine block.

Selecting Your Rebuild Kit by CPL

When it comes to Cummins engines, selecting the correct rebuild kit begins with identifying the Control Parts List (CPL) number. This four-digit code determines the exact configuration of your engine, including pistons, injectors, camshaft profile, timing, and emissions components. Ordering the wrong kit without referencing the CPL could lead to mismatched parts and costly delays.

Why the CPL Matters

Even if two Cummins engines share the same base model (like 6CTA or KTA19), they may have completely different internal setups depending on their CPLs. This is especially true in marine and industrial environments, where engines are often customized for specific power requirements, gear ratios, and auxiliary systems.

How to Find the CPL Number

• Engraved on the dataplate: You can find it on the metal tag located on the valve cover or gear housing.

• Stamped on the block: In many cases, the CPL is also stamped near the injector pump or on the intake side of the block.

• Need help locating it? Contact Diesel Pro Power  and our support team will walk you through how to find it or help identify your engine using pictures.

Selecting the Right Rebuild Kit

Once you have your CPL, match it against the product description. At Diesel Pro Power, each Cummins rebuild kit lists the CPLs it supports. If you’re still unsure, call us directly and we’ll verify it for you—so you can order confidently and get the right overhaul kit the first time.

Guide To Reading Your Cummins Engines Dataplate

What Parts Come in a Rebuild Kit?

A typical Cummins rebuild kit—also known as an in-frame overhaul kit—includes all the major components needed to restore your engine’s performance, compression, and reliability. While contents vary slightly by engine model, most kits include the following:

Core Components in Every Rebuild Kit:

• Pistons – Matched to your CPL

• Piston rings – For sealing compression

• Cylinder liners (wet or dry) – Replace worn cylinder walls

• Rod bearings – Support piston connecting rods

• Main bearings – Support the crankshaft

• Thrust washers – Prevent crankshaft endplay

• Gudgeon pins & clips – Secure pistons to connecting rods

Gaskets & Seals:

• Lower gasket set – Includes oil pan, timing cover, and front/rear seals

• O-rings & sealing washers – For oil passage integrity

• Crankshaft seals – Front and rear (added to cart separately)

• Thermostat housing and valve cover gaskets

• Upper Gasket Sets: Head gaskets etc. 

Signs It’s Time to Rebuild Your Engine

Recognizing when it’s time for a Cummins rebuild kit can save you from catastrophic engine failure. Whether you're operating a marine vessel, generator, or industrial machine, these are the top warning signs that your engine may need an in-frame rebuild.

1. Excessive Exhaust Smoke

• White smoke: Indicates coolant is entering combustion chamber.

• Blue smoke: Sign of oil burning, often due to worn piston rings.

• Black smoke: Points to incomplete combustion from fuel delivery issues.

2. Loss of Power

If you’re noticing sluggish acceleration, low RPM torque, or difficulty maintaining load under power, it could mean low compression—often solved with a new rebuild kit.

3. High Oil Consumption

Frequent oil top-ups are a red flag. Worn piston rings and leaking seals—both replaced in a rebuild—are common culprits.

4. Coolant in Oil or Oil in Coolant

This often indicates a failed head gasket or cracked cylinder liner. Replacing them with a proper overhaul kit during a rebuild is the only solution.

5. Blow-by or Crankcase Pressure

If you’re seeing vapor blowing from the oil filler cap, that’s combustion gases escaping past worn piston rings—a classic sign it’s rebuild time.

6. Knocking, Ticking, or Metallic Noises

Engine knock, especially under load, is often due to worn bearings or excessive piston-to-wall clearance—both addressed in a complete Cummins rebuild kit.

7. Poor Fuel Economy

Sudden drops in fuel efficiency could mean worn injectors, rings, or valves—not just a fuel system issue. An engine refresh can solve this.

B Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins 4B

The 4B rebuild kit is a perfect fit for compact applications like auxiliary generators and small marine engines. Designed for straightforward in-frame overhauls, this kit restores compression and reliability. As a complete overhaul kit, it includes everything needed for full engine restoration without pulling the block.

Rebuild Kit for Cummins 4BT

Our 4BT rebuild kits are ideal for light commercial marine use and compact workboats. Designed for high-efficiency and longevity, these kits also double as engine overhaul kits, giving you all gaskets, rings, and bearings in one convenient package.

Rebuild Kit for Cummins 4BTA

The 4BTA rebuild kit is optimized for turbocharged variants, offering high-strength pistons and heat-resistant gaskets. If you're performing a top-to-bottom refresh, this kit functions seamlessly as a full overhaul kit.

Rebuild Kit for Cummins 6B

This 6B rebuild kit is made for mid-size marine vessels and utility equipment. It supports in-frame repairs with premium-grade components and acts as an ideal overhaul kit for rebuilding your Cummins engine efficiently and affordably.

Rebuild Kit for Cummins 6BT

A highly requested option, the 6BT rebuild kit includes wear-resistant pistons and bearings suited for both saltwater and freshwater environments. This kit can also be used as a comprehensive overhaul kit for boats requiring top-end rebuilds.

Rebuild Kit for Cummins 6BTA

The 6BTA rebuild kit is the preferred choice for turbocharged 5.9L engines, especially in high-performance marine settings. With upgraded components to match turbo and aftercooler requirements, it also serves as a complete overhaul kit.

Rebuild Kit for Cummins ISB

Designed for electronically controlled diesel engines, the ISB rebuild kit includes sensors and emissions-compliant materials. It’s your one-stop overhaul kit when performing maintenance on newer Cummins engines.

Rebuild Kit For ISB 4.5
Rebuild Kit For ISB 5.9
Rebuild Kit For ISB 6.7 

Rebuild Kit for Cummins QSB

Our QSB rebuild kit is ready for hard-working marine engines operating in tough environments. This advanced kit is ideal for full in-frame rebuilds and also doubles as a top-tier overhaul kit for complete system restoration.

Rebuild Kit For QSB 4.5

Rebuild Kit For QSB 5.9 

Rebuild Kit For QSB 6.7

Rebuild Kit For QSB 7.0

C Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins 6C

The 6C rebuild kit includes liners, pistons, rings, and all core components for in-frame servicing. With its comprehensive design, it also performs as a full overhaul kit for commercial boats and service fleets.

Rebuild Kit for Cummins 6CT

Choose a 6CT rebuild kit when performance starts to decline. This kit is optimized for durability and can be used as a complete overhaul kit to bring marine or industrial engines back to factory performance.

Rebuild Kit for Cummins 6CTA

Our most popular option, the 6CTA rebuild kit, supports both recreational and commercial applications. Available in multiple configurations based on CPL numbers and piston styles, this rebuild kit functions as a ready-to-install overhaul kit.

Rebuild Kit for Cummins ISC

The ISC rebuild kit is tailored for high-efficiency marine diesels. It includes emissions-rated materials and complete sealing solutions, doubling as an overhaul kit for demanding rebuild tasks.

Rebuild Kit for Cummins QSC

Built for long-term reliability, the QSC rebuild kit features premium rings, pistons, and gaskets. Whether used for a scheduled in-frame service or as an extensive overhaul kit, it’s designed to handle high-output marine performance.

L Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins L10

The L10 rebuild kit offers deep restoration capability for Cummins L-series engines. Built for marine-grade usage, it works equally well as a full overhaul kit for larger utility applications.

Rebuild Kit for Cummins ISL

This ISL rebuild kit includes high-quality cylinder kits and bearings matched to OEM specs. Use it as a standard rebuild or as a complete overhaul kit for valve and piston servicing.

Rebuild Kit for Cummins QSL

The QSL rebuild kit delivers performance you can count on. It contains all essential components for in-frame service and acts as a long-life overhaul kit built for durability in the field.

M Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins M11

The M11 rebuild kit is engineered for commercial marine engines and delivers reliable results under pressure. For boats undergoing extensive maintenance, it works well as an overhaul kit.

Rebuild Kit for Cummins ISM

Our ISM rebuild kit supports heavy-duty operations with precision parts, and when more than a bottom-end rebuild is needed, it becomes your go-to overhaul kit for full engine refresh.

Rebuild Kit for Cummins QSM11

Choose a QSM11 rebuild kit when working on high-output marine platforms. Whether it’s for tugs or crew boats, this kit is ideal for in-frame repair and as a top-tier overhaul kit option.

N Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins NH855

The NH855 rebuild kit restores legendary performance to this large-bore Cummins workhorse. It’s well-suited as a classic overhaul kit, compatible with marine and industrial environments.

Rebuild Kit for Cummins NT855

This NT855 rebuild kit ensures dependable engine restoration with high-quality liners and main bearings. It also serves as a trusted overhaul kit when you're upgrading more than just the short block.

Rebuild Kit for Cummins N14

Built for reliability and efficiency, the N14 rebuild kit is designed for in-frame use but contains all the components needed to act as a complete overhaul kit for your vessel’s engine.

X Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins ISX

The ISX rebuild kit is perfect for modern Cummins engines requiring full in-frame restoration. All kits are CPL-specific and double as full overhaul kits to tackle top-end and emission component refresh.

Rebuild Kit For ISX Single Cam

Rebuild Kit For ISX Dual Cam

Rebuild Kit for Cummins QSX

A popular choice for rugged operations, the QSX rebuild kit includes the necessary hardware and piston assemblies for long-term reliability. It can also be used as a complete overhaul kit.

K Series Rebuild Kits for Cummins Engines

Rebuild Kit for Cummins KTA19

Our KTA19 rebuild kit is designed for high-load commercial and industrial engines. With CPL-specific configurations, it’s ideal for in-frame rebuilds and performs as a full overhaul kit when needed.

Rebuild Kit for Cummins KTA38

The KTA38 rebuild kit features large-bore liners and heavy-duty components. Whether used on ships or barges, this rebuild kit functions as a trusted overhaul kit for deep restoration projects.

Rebuild Kit for Cummins KTA50

Choose the KTA50 rebuild kit when handling the biggest Cummins applications. Built to handle extreme workloads, this kit is both a reliable rebuild solution and a powerful overhaul kit.

Rebuild Kit for Cummins QSK19

Advanced marine and industrial engines benefit from our QSK19 rebuild kit, which includes parts compatible with high-tech fuel systems and advanced cooling configurations. This also qualifies as a top-quality overhaul kit for full system updates.

Why Diesel Pro Power for Your Cummins Rebuild Kit?

• Same-day global shipping from our fully stocked warehouse

• Expert phone support to match you with the correct CPL-compatible kit

• OEM-matching warranty on all parts

• Secure checkout with optional pre-paid duties and taxes

• Trusted by commercial fleets, fishing captains, and industrial operators

Looking for Individual Components?

If you’re only replacing specific parts—like a lower gasket set, piston rings, or bearings—we also sell each component separately. But for convenience, value, and completeness, most of our customers opt for a Cummins rebuild kit that doubles as a full overhaul kit.

25 Frequently Asked Questions About Rebuild Kits for Cummins Engines

1. What is included in a rebuild kit for Cummins engines?

A typical rebuild kit for Cummins engines includes pistons, piston rings, cylinder liners, rod bearings, main bearings, thrust washers, and a lower gasket set. Some models may also include a full overhaul gasket set depending on the CPL and engine type.

2. Is a rebuild kit the same as an overhaul kit for Cummins engines?

Yes. In most cases, a rebuild kit for Cummins engines functions as a complete overhaul kit, providing everything needed to perform an in-frame engine rebuild.

3. How do I choose the correct rebuild kit for my Cummins engine?

The best way is to match your engine’s CPL (Control Parts List) number to the supported CPLs listed on the product page. If you’re unsure, Diesel Pro Power’s team can assist in verifying compatibility.

4. Can I install a rebuild kit for Cummins engines without removing the engine?

Yes. These are in-frame rebuild kits, meaning the engine block remains in place during the rebuild process, saving time and effort.

5. Are rebuild kits for Cummins marine engines corrosion-resistant?

Absolutely. Diesel Pro Power's rebuild kits for Cummins marine engines are built using marine-grade gaskets and seals, engineered to withstand saltwater environments and high humidity.

6. Do you stock rebuild kits for all Cummins engines?

We carry rebuild kits for a wide range of Cummins engine models, including 4B, 6BT, 6CTA, ISX, KTA19, QSK19, and more. Contact us if your model isn’t listed—we can likely help.

7. Are these rebuild kits aftermarket or OEM?

Diesel Pro Power provides premium aftermarket rebuild kits for Cummins engines that meet or exceed OEM performance and durability standards.

8. How fast can I get a rebuild kit for my Cummins engine?

Most orders ship within 24 hours. U.S. customers typically receive their kits in 1–3 business days. International orders are delivered within 3–5 business days, and you can prepay duties and taxes at checkout for a smoother delivery process.

9. Can I get help selecting the correct rebuild kit for my Cummins engine?

Yes. Our experienced team is ready to help you choose the correct rebuild kit for Cummins engines based on your CPL number or engine model. Visit dieselpro.com/help or call us directly for fast assistance.

10. Do rebuild kits for Cummins engines include all gaskets?

Yes. Every rebuild kit for Cummins engines includes both the upper and lower gasket kits, giving you all the seals, O-rings, and gaskets needed to complete a full in-frame overhaul.

11. Are rebuild kits suitable for high-hour Cummins engines?

Absolutely. A rebuild kit for Cummins engines is a reliable solution for high-hour engines that need compression restored, oil consumption reduced, and long-term performance regained.

12. Do you offer rebuild kits for turbocharged Cummins engines?

Yes. We offer rebuild kits for turbocharged models like the 4BTA, 6BTA, QSB, and others. These kits include turbo-rated pistons and heat-resistant gasket materials.

13. Can a rebuild kit improve fuel economy for Cummins engines?

Yes. Restoring compression with a rebuild kit can improve combustion efficiency, reduce fuel consumption, and help your Cummins engine perform like new.

14. What kind of warranty comes with a rebuild kit for Cummins engines?

Every rebuild kit for Cummins engines from Diesel Pro Power comes with a 1-year warranty. This covers the quality and reliability of all components included in the kit when installed and used under normal operating conditions.

15. How do I find my Cummins engine’s CPL number?

You can find the CPL (Control Parts List) number on the metal dataplate, typically located on the valve cover, timing cover, or gear housing. If the dataplate is missing or unreadable, our team can help identify your engine using photos or key specs.

16. What does “in-frame” mean in relation to a rebuild kit?

An in-frame rebuild refers to restoring the engine while it remains installed in the boat, truck, or machine. A rebuild kit for Cummins engines provides all the internal components needed to perform this service without removing the engine block.

17. Can I return a rebuild kit if I order the wrong one?

Yes—but it's important to confirm your rebuild kit for Cummins engines by CPL number before ordering to avoid errors. If a return is necessary, the kit must be unopened and unused, and a Return Goods Authorization (RGA) must be requested in advance. A 10% restocking fee applies to all authorized returns.

18. Do you offer rebuild kits for stationary engines and generators?

Yes. We offer rebuild kits for Cummins engines used in a variety of applications, including stationary generators, water pumps, industrial equipment, and backup power systems.

19. Are rebuild kits available in bulk for fleet operators?

Yes. Diesel Pro Power supports fleet operators with bulk ordering, volume discounts, and priority service. Contact our team to set up a fleet account or receive a custom quote for large or recurring orders.

20. Do your rebuild kits support international Cummins engine versions?

Absolutely. As long as we receive your CPL number or accurate engine details, we can match the correct rebuild kit for Cummins engines used outside the United States. We also offer fast international shipping with pre-paid duty and tax options.

21. What’s the difference between the upper and lower gasket kits included?

A rebuild kit for Cummins engines includes both:

• The lower gasket kit: oil pan gaskets, crankshaft seals, timing cover, and water pump gaskets.

• The upper gasket kit: cylinder head gasket, valve cover gasket, intake/exhaust manifold gaskets, injector seals, and thermostat seals.

Together, they provide full in-frame sealing coverage for a complete engine restoration.

22. Do I need to replace my injectors during a rebuild?

Not always, but it’s highly recommended to inspect them during the rebuild. If your injectors are leaking, worn, or underperforming, replacing them while installing your rebuild kit for Cummins engines can prevent future failures and optimize fuel efficiency.

23. Can I reuse old components when installing a rebuild kit for Cummins engines?

It’s not recommended. While some components may appear reusable, reusing worn parts—especially pistons, bearings, or gaskets—can compromise the rebuild. A rebuild kit for Cummins engines is designed to replace all wear-prone internals to restore full performance, reliability, and compression. For best results, use all new parts included in the kit.

24. Do rebuild kits include camshaft bushings or timing gears?

No, camshaft bushings and timing gears are not included in a standard rebuild kit for Cummins engines. These parts are considered external to the in-frame rebuild process. However, if your rebuild includes top-end or timing system service, we offer these components separately and can help you add them to your order.

25. Why should I buy a rebuild kit for Cummins engines from Diesel Pro Power?

Because Diesel Pro Power delivers what professionals need—fast. We provide accurately matched rebuild kits based on CPL number, ship within 24 hours, back all kits with a 1-year warranty, and offer expert customer support before and after your purchase. Our rebuild kits for Cummins engines are trusted worldwide by marine captains, mechanics, and fleet operators who depend on reliability, performance, and real expertise.