Category: Caterpillar C15 Engine Parts: Durable Components for Legendary Performance

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When Do You Need New Fuel Injectors for Your Cat C15 ACERT Diesel Engine?

Has the performance of your CAT C15 ACERT taken a dive? Are you going through a lot more fuel than you used to? 

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Problems That Require Diesel Engine Cylinder Head Components for CAT C15

Is your cylinder head failing? It might be, but you might be surprised to find out that individual components within the cylinder head could be the cause of your issues.

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Problems Indicating CAT C15 Diesel Head Gasket Failure

So, we’ve talked about various components of your CAT C15 is located where the most combustion is created. Remember that your head gasket creates the seal that allows for the combustion in your engine to happen properly. If your combustion chamber isn’t sealed properly, you’ll have a noticeable change in the performance of your diesel engine.

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CAT C15 Diesel Engine Turbocharger Problems

Are you noticing lower power or low boost in your CAT C15 diesel engine? Is your engine performance lacking? You may have a turbocharger that’s going bad! 

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HHP Spotlight: How to Rebuild a Caterpillar C2.2 T/A Diesel Engine

Are you working on your Caterpillar C2.2 T/A? Does it need a complete rebuild? (If you’re not sure whether or not your engine might be need to be rebuilt, we’ve got some signs to watch out for!)

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The Primary Differences Between Caterpillar 3406E, C15, and C15 Acert Diesel Engines

Picking the right diesel engine model is no easy task. If you’re considering purchasing a Caterpillar 3406E, C15, or C15 ACERT, we have the information to help you make a decision.

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When to Rebuild Your Caterpillar C15 Diesel Engine

Diesel engines are built to last you can run them for miles and miles. But, eventually, you’re going to have to rebuild that engine.

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Cylinder Head Problems on a Caterpillar C15 Diesel Engine

As you might expect, Caterpillar C15 diesel engines are a very popular model with our customer base. If you’re interested in the history of the C15, check out our C15 engine spotlight!

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HHP Spotlight: About the Caterpillar C15 Diesel Engine Inframe Rebuild Kit

We’ve highlighted several different rebuild kits in the past, and today we’re going to focus on an in-chassis kit for a C15 acert.

Continue reading HHP Spotlight: About the Caterpillar C15 Diesel Engine Inframe Rebuild Kit

Learn about premium Caterpillar C15 engine parts for Class 8 trucks, heavy equipment, and industrial applications at Highway and Heavy Parts. Our inventory includes cylinder heads, camshafts, pistons, turbochargers, and complete engine rebuild kits engineered to meet or exceed OEM standards. Whether you’re maintaining a legacy C15 or performing a full engine rebuild, we offer parts designed for long-lasting performance in demanding diesel environments.

The Caterpillar C15 (pre-ACERT) engine, introduced in the early 2000s, is known for its simplicity and durability. With a 15.2L displacement and horsepower ratings ranging from 435 to 550 HP, it was a workhorse in over-the-road trucks and vocational equipment. Our C15 parts are compatible with popular models across Freightliner, Kenworth, Peterbilt, and Caterpillar construction equipment.

What C15 Engine Parts Are Available?

We stock engine blocks, cylinder kits, engine bearings, camshafts, fuel system components, turbochargers, oil pumps, gaskets, and complete C15 engine rebuild kits. Choose from genuine Caterpillar parts and high-quality aftermarket alternatives designed for direct-fit installation.

How Do I Identify Parts for a C15 Engine?

Use your engine’s serial number (prefixes like 6NZ or MBN) located on the engine data plate. Our technical team can help verify compatibility to ensure you get the right components the first time.

Why Choose HHP for C15 Parts?

  • Industry-Best Warranties on Aftermarket Components
  • Fast Shipping from Strategically Stocked Warehouses
  • In-House Diesel Technicians for Expert Support

The Caterpillar C15 remains one of the most trusted engines in the diesel world. Maintain its performance with trusted parts from HHP.

FAQs for the Caterpillar C15

  1. What’s the difference between the C15 and C15 ACERT engines?
    The C15 is the original pre-ACERT version of Caterpillar’s 15.2L engine, known for mechanical simplicity and reliability. The ACERT version added emissions components and electronics for EPA compliance.
  2. What serial numbers are associated with the C15 engine?
    Common serial number prefixes include 6NZ, MBN, and 1LW. These help identify part compatibility, especially for engine rebuild kits and fuel system components.
  3. Can I use aftermarket parts in a C15 engine rebuild?
    Yes, high-quality aftermarket parts manufactured to OEM specifications are available and widely used for C15 engine rebuilds. They offer cost savings without compromising reliability.
  4. What trucks use the C15 engine?
    The C15 engine was used in Freightliner, Peterbilt, Kenworth, and International Class 8 trucks, as well as in some Caterpillar construction equipment.
  5. How often should C15 components like turbos and injectors be replaced?
    Fuel injectors typically last 300,000 to 400,000 miles, while turbochargers may last 500,000 miles or more, depending on load and maintenance.