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Diesel Engine Rebuild Kits for Heavy Duty Trucks

When your truck starts losing power, burning oil, or struggling under load, it’s not ready for the scrapyard. At Fitzgerald Truck Parts, we help you get more miles out of your equipment with high-quality diesel engine rebuild kits built for real work.

A properly matched engine rebuild kit gives you the ability to restore performance without the cost of a full engine replacement. These kits are commonly used when engines develop low compression, excessive oil consumption, cylinder wear, or fatigue from long hauls. Instead of replacing the entire unit, our semi truck engine rebuild kits let you rebuild the core and get back on the road faster.

Each of our diesel engine overhaul kits includes essential diesel engine rebuild components like pistons, liners, bearings, gaskets, seals, and rod components. These are the parts that take the most abuse. Replacing them with durable engine overhaul parts restores power and reliability where it counts.

We carry kits for the engines that keep fleets moving, including Cummins ISX, Caterpillar C12 and C15, and Detroit diesel platforms, including the proven Detroit diesel series. If you are weighing your options, rebuilding is often the smarter investment compared to a full replacement. You can also browse if a full swap makes more sense.

Complete your rebuild with and explore additional to cover every part of the job. For easier installs, add to your order.

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Types of Diesel Engine Rebuild Kits

We offer multiple rebuild kit options to match your repair.

  • In-frame kits allow you to rebuild the engine without removing it from the truck. These typically include pistons, rings, liners, rod bearings, main bearings, and gasket sets. This option helps reduce downtime and labor.
  • Cylinder kits are designed for targeted repairs. They usually include a piston, liner, rings, and wrist pin, making them ideal when damage is limited to specific cylinders.
  • Gasket kits replace seals throughout the engine to prevent leaks and restore compression during a rebuild. We also carry smaller kits and components that can be combined into complete rebuild kits, including liner kits and bearing sets.

Diesel Engine Rebuild Kits by Engine Platform

We organize our kits by engine platform so you can quickly find the right match.

  • For Cummins engines, we carry rebuild kits for ISX applications, including piston and liner kits along with full overhaul options.
  • For Detroit engines, we offer solutions for Series 60 platforms, including cylinder kits, piston and liner sets, and full rebuild options.
  • For Caterpillar engines, we stock rebuild and install solutions for C12 and C15 models.

Before ordering, verify your engine model, serial number, compression ratio, piston type, and liner size. If you need help, contact our customer support team and we will guide you to the correct kit.

Trusted Diesel Engine Rebuild Kit Brands

We offer rebuild kits from proven manufacturers like PAI Truck Parts, Interstate McBee, PDI, Detroit, Cummins, and CAT. These brands are known for producing durable aftermarket parts for heavy-duty applications. Many kits include upgraded features such as coated pistons and improved bearing materials that help extend engine life under demanding conditions.

We make it easy for you to compare options and choose what fits your build and budget.

How to Choose the Right Diesel Engine Rebuild Kit

Start by confirming your engine details, including make, model, serial number, compression ratio, piston style, and liner size.

Next, decide between an in-frame kit or a full overhaul kit. In-frame kits work well for faster repairs, while full kits are better for engines with extensive wear.

Round out your rebuild with the right supporting parts. Shop our bearing kits, explore our engine components, or upgrade to reman engines if needed. For a smoother install, add installation kits.

Browse our selection of diesel engine rebuild kits above and choose the parts that keep your truck working. If you are unsure about the parts you need or have any questions, our team is ready to help.

Diesel Engine Rebuild Kit FAQs

What comes in a diesel engine rebuild kit?

Most kits include pistons, rings, liners, bearings, and gaskets needed to restore engine performance.

What is an inframe diesel engine rebuild kit?

It allows you to rebuild the engine while it remains installed in the truck.

How long does a rebuild last?

A properly rebuilt engine can run for hundreds of thousands of miles with proper maintenance.

Is rebuilding cheaper than replacing?

In many cases, rebuilding is more cost-effective than replacing the entire engine when the core is still usable.