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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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  • PAI Truck Parts 60 Series Slip Pin Overhaul Kit (16.5:1 CR)

    PAI Truck Parts

    60 Series Slip Pin Overhaul Kit (16.5:1 CR)

    The 60 Series Slip Pin Overhaul Kit (16.5:1 CR) from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Built to keep your diesel running strong through the daily grind of over-the-road and vocational work.Slip Pin...

    $3,100.00
  • PAI Truck Parts Cummins ISX Engine Kit

    PAI Truck Parts

    Cummins ISX Engine Kit

    The Cummins ISX Engine Kit from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Engine...

    $3,095.00
  • Newstar TF750 Maintenance Kit

    Newstar

    TF750 Maintenance Kit

    The TF750 Maintenance Kit from Newstar is a genuine Newstar heavy-duty truck part you can count on. Built to keep your diesel running strong through the daily grind of over-the-road and vocational work.REPLACEMENT FOR BENDIXWorks W/ NS750 Replaces Part...

    $129.39
  • PAI Truck Parts 60 Series Bolt on Overhaul Kit

    PAI Truck Parts

    60 Series Bolt on Overhaul Kit

    Bolt On Overhaul Kit Detroit 60 Series Engine Contains: Basic Overhaul Kit Oil Pan Gasket Lower Bearing Kit Thermostats Injector O-Ring Kit   Replaces OEM Part Number: R23539734 R23533033

    MSRP: $2,950.00
    $2,600.00
  • PAI Truck Parts Bolt on  Kit with Coated Bearings

    PAI Truck Parts

    Bolt on Kit with Coated Bearings

    Bolt On Overhaul Kit for Detroit 60 Series Inframe Engine Kit w/ OE Head Gasket | Detroit Diesel S60 Engines application

    $3,750.00
  • PAI Truck Parts Detroit 60 Series Inframe Kit

    PAI Truck Parts

    Detroit 60 Series Inframe Kit

    INFRAME ENGINE KIT Replaces OEM Part Number:  23531599   Kit Contains: (6) Cylinder Kits (7) Cam Bearings (38) Cylinder Head Bolts (1) Oil Pan Gasket (2) Thermostats (1) Injector O-Ring Kit (1) Lower End Bearing Kit (1) Engine Gasket Kit

    $2,829.90
  • PAI Truck Parts PAI Liner Kit

    PAI Truck Parts

    PAI Liner Kit

    The PAI Liner Kit from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Fitment: Confirm this...

    $132.03
  • Standard lower ring

    The Standard lower ring from Fitzgerald Truck Parts is a heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Fitment: Confirm this part fits...

    $40.00
  • PAI Truck Parts PAI Bolt on Cylinder kit 033

    PAI Truck Parts

    PAI Bolt on Cylinder kit 033

    The PAI Bolt on Cylinder kit 033 from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Cylinder...

    MSRP: $350.00
    $292.30
  • Akmi FLywheel 2WS

    Akmi

    FLywheel 2WS

    The FLywheel 2WS from Akmi is a genuine Akmi heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Fitment: Confirm this part fits your truck's...

    $434.00
  • Interstate McBee Slip Pin Inframe Engine Overhaul Kit for Detroit 60 Interstate McBee Slip Pin Inframe Engine Overhaul Kit for Detroit 60

    Interstate McBee

    Slip Pin Inframe Engine Overhaul Kit for Detroit 60

    Engine Kit Inframe Overhaul #A-MCOF23532554Q Slip Pin. Kit include 23522279 Gasket-oil pan, 235261426 shell set-con rod, 2352893x 6 nozzle-piston cooling, 2353272OFTS3 gasket set-custom, 8929670 6 shell set, 8929690 7 bearing-camshaft, CG150-PR 43...

    $2,200.00
  • PAI COMPLETE ENGINE GASKET KIT D-60

    PAI COMPLETE ENGINE GASKET KIT D-60

    The PAI COMPLETE ENGINE GASKET KIT D-60 from Fitzgerald Truck Parts is a heavy-duty truck part you can count on. Built to keep your diesel running strong through the daily grind of over-the-road and vocational work.Fitment: Confirm this part fits your...

    $90.87
  • PAI Truck Parts Detroit 60 Series Slip Pin Rod 17:1 Compressor, Coated

    PAI Truck Parts

    Detroit 60 Series Slip Pin Rod 17:1 Compressor, Coated

    The Detroit 60 Series Slip Pin Rod 17:1 Compressor, Coated from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance...

    $540.39
  • Interstate McBee Bolt On Inframe Engine Overhaul Kit  For Detroit 60 Interstate McBee Bolt On Inframe Engine Overhaul Kit  For Detroit 60 Interstate McBee Bolt On Inframe Engine Overhaul Kit  For Detroit 60

    Interstate McBee

    Bolt On Inframe Engine Overhaul Kit For Detroit 60

    Engine Kit Inframe Overhaul Interstate-McBee #A-MCOF23532558Q Bolt On. Engine Kit Inframe Overhaul #A-MCOF23532554Q Slip on. Kit include 23522279 Gasket-oil pan, 235261426 shell set-con rod, 2352893x 6 nozzle-piston cooling, 2353272OFTS3 gasket...

    MSRP: $3,100.00
    $2,600.00
  • Cooling Nozzle Cummins

    PAI Truck Parts

    Cooling Nozzle Cummins

    Piston Cooling NozzleCummins N14 applicationDupont Zytel Plus Replaces Cummins Part Numbers: 3068526 3082522 4058947

    $6.34
  • Detroit Diesel Rear Main Seal Orange

    Detroit Diesel

    Rear Main Seal Orange

    The Rear Main Seal Orange from Detroit Diesel is a genuine Detroit Diesel heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Rear Main Seal -...

    $90.17
  • PAI Truck Parts PAI Slip Pin Kit with Coated Bearings/Monotherm Pistons

    PAI Truck Parts

    PAI Slip Pin Kit with Coated Bearings/Monotherm Pistons

    The PAI Slip Pin Kit with Coated Bearings/Monotherm Pistons from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable...

    $4,300.00
  • PDI Caterpillar Emodel/C15 Manifold Install Kit

    PDI

    Caterpillar Emodel/C15 Manifold Install Kit

    The PDI 9445K Installation Kit is a complete set of gaskets and seals needed to install our Big Boss Exhaust Manifold on all Cat C15, C16, and EModel Engines.  Included with the kit: One Piece Seamless Sleeve Gaskets Turbo Flange...

    $510.00
  • PAI Detroit 60 Series Slip Pin Cylinder Kit 16.5:1

    PAI Detroit 60 Series Slip Pin Cylinder Kit 16.5:1

    The PAI Detroit 60 Series Slip Pin Cylinder Kit 16.5:1 from Fitzgerald Truck Parts is a heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.PAI...

    $444.92
  • PAI Truck Parts PAI Bolt On Rod Bearing (SET OF 2)

    PAI Truck Parts

    PAI Bolt On Rod Bearing (SET OF 2)

    The PAI Bolt On Rod Bearing (SET OF 2) from PAI Truck Parts is a genuine PAI Truck Parts heavy-duty truck part you can count on. Built to keep your diesel running strong through the daily grind of over-the-road and vocational work.Fitment: Confirm this...

    $18.99
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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.