Mack engines have long meant durability and strength just look at their bulldog mascot. They were founded in 1900, originally as the Mack Brothers Company. They are now owned by Volvo, but through their long history they’ve produced engines that remain popular with many operators.
But even though they’re built to last, there are times when you’ll need to purchase replacement parts for your Mack engine. And when you do, you’ll need to have some identification numbers ready to help ensure you get the right parts for your diesel engine. So we’re going to go through some information that might be useful to you as you shop.
Having trouble with your diesel engine? Read our blog, Common Diesel Engine Problems, to learn more about frequently experienced issues.
What are the Mack Model Designation Meanings?
The engine model designation meanings have changed slightly through Mack’s history, so the exact definition depends on if you have an older or newer model. For example, the letters for an early model mean the following:
- E: Mack Diesel Engine
- D: Derated Version of Engine
- T: Turbocharged
- B: Mack Dynatard Engine Brake
- A: Single Stage Aftercooler
- S: Two Stage Aftercooler
- EN: Engine
- END: Naturally Aspirated Diesel
- ENDT: Turbocharged Diesel
- ENDTB: Turbocharged Diesel with Engine Brake
- ENDL: Lightweight Version of END
- ENDLT: Lightweight Version of ENDT
These prefixes would also include an emission standard designator (Z, Y, or X), followed by numbers that tell the cubic inch displacement.
The newer engines have a simpler system of setting up the engine model designator. There are three prefix letters:
- E: Mack Turbocharged Diesel Engine
- M: Maxidyne Engine
- C: California Certified
Three prefix numbers:
- 6: 672 Cubic Inch
- 7: 728 Cubic Inch
- 9: 998 Cubic Inch
This is followed by three digits that indicate horsepower, and then there can be a suffix letter (L or R) that points to the engine speed.
Have more questions about your Mack diesel engine? Call our ASE Certified Technicians and let them give you a hand!
Where Are my Mack Engine Numbers Located?
When you call in for parts, though, it’s not enough to know the engine model designator number. You still might end up getting incorrect parts. For Mack engines, there are two things we typically ask customers for to help us ensure they’re ordering the right parts your engine serial number or your VIN number.
The most popular Mack engine serial number we deal with begins with “11GBA” and is followed by a string of 6 numbers and letters that help make it distinct.
Common locations include:
- On the Valve cover
- On the Engine Block
- Near the Timing Cover Housing
- On a Metal Tag Attached to the Engine
Over time, these plates can become dirty, worn, or hard to read – especially in heavy-duty applications. The number should be etched on, not cast, as it should be unique to your engine.
If you are unable to locate your engine serial number, we can also use your 17 digit VIN number to help get you the right parts. If this is not on the engine information plate, it can usually be found stamped into the frame. Usually it’s on the passenger side, but it’s not always consistent.
Mack Engine Serial Number vs. Model Number
It’s important not to confuse the engine model with the serial number.
The model tells you the general engine type.
The ESN tells you the exact build.
Both are important – but the serial number is what ensures precision when ordering parts.
Why is my Mack ESN Important?
Using the wrong part on a diesel engine can create bigger problems than the original issue.
A Mack engine serial number lookup helps:
- Ensure Correct Part Fitment
- Prevent Ordering The Wrong Components
- Reduce Downtime And Delays
- Avoid Repeat Repairs
Even small differences – like injector variations or internal tolerances – can affect performance and longevity.
Still have questions about finding your engine serial number or your Mack engine? Talk to a certified tech at 844-304-7688, or request a quote online. We can help find the right parts for your diesel engine!
