Navistar Diesel Engine Serial Numbers


Navistar Diesel Engine Serial Numbers | Highway & Heavy Parts

At some point in time, you'll probably need to know where the engine serial number is on your Navistar engine. Having this number can help ensure that you're getting the correct diesel engine replacement parts when you shop.

Like with other diesel engines, this can be tricky to find if you don't know where to look. We're here to help you find your Navistar diesel engine serial number!

If you're looking for parts for your Navistar engine, our ASE Certified Technicians are here to help you find exactly what you need!

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How to Find Your Navistar Engine Serial Number

The engine serial number for Navistar engines can be found stamped on a pad on the block. Navistar keeps the location pretty simple. For engines that were built before 2000, that pad can be found on the left side of the block, just under the head-to-block parting line. For engines newer than that, the pad is on the right side of the block, between the oil cooler and the top of the block.

For most Navistar engines that were built after 1993, you will need more than just the engine serial number. You will also need the engine model, model year, horsepower rating, and torque rating, which can all be found on the emission label. The emission label is located on the top of the rocker cover or intake manifold.

Read our blog dedicated to diesel engine serial numbers if you want to know more!


Navistar Engine Serial Number Format

Navistar uses a standard format for their engine serial numbers, which is incredibly helpful for giving information about the engine.

  • The first three (or four, in some cases) digits indicate the engine model. For example, 466 or 570H.
  • The number after the engine model indicates the configuration; B is for turbo JWAC, D is for naturally aspirated, G is for turbo air to air, H is for HEUI, and T is for turbo engines.
  • The next number and letter combination indicates the application; A2 means a service vehicle and M2 means a truck.
  • The next letter will be the same for all, and is a U, which indicates that the country of origin is the United States.
  • The last seven digits indicate the unit number, which is the part that will be different for each different engine.

Looking for a rebuild kit? Take a look at our product spotlight on this Navistar inframe kit! It might be the one for you!


The Importance of Your Navistar Engine Serial Number


inputting your navistar esn | Highway & Heavy Parts


Engine serial numbers are incredibly important when you have a heavy duty diesel engine. If you have a heavy duty diesel engine, you probably already know that they dont follow the Make-Model-Year formula that automotive engines do. An engine thats a particular model is not guaranteed to be exactly the same as another engine of that same model. Engine serial numbers are a surefire way to get a list of the exact parts that are in your engine.

When youre working on your engine and you go to order parts, well need to know your ESN so we can get that list of parts in your engine. This will guarantee that we get you the right stuff. The only additional thing we would need to know is if you have over-sized bearings, or have otherwise changed the engine specifications, as that would not be accounted for in the ESN.

If youre ordering your parts over the phone, you can just tell your salesperson your ESN. If youre ordering online, you will see that some product pages have a field underneath the price where you can input your engine serial number when placing an order. If this field exists on a page, we will need your ESN. Even if you dont supply it when placing the order, youll still probably get a call or email from us asking for it. So, to get your order processed without delays, be sure to input it when you order.


Got questions? HHP has a team of ASE Certified Techs on staff to answer even your toughest questions. Give us a call at 844-304-7688! You can also request a quote online.

Originally Posted November 1, 2017; Edited November 29, 2019