Locate Your CAT Engine Serial Number


When looking to buy a replacement engine for your piece of equipment, it is important to know the serial number of your current engine. This information can be found on the engine data plate, located on the left side by the injection pump. Engine serial numbers are also stamped on the engine block.

The serial number is usually 8 digits long. Pictured: engine data plate with a serial number of MSX81323.

Write down the numbers or take a picture of the data plate and give us a call. A Diesel Engine Specialist will be able to verify whether we can supply a new engine, re-manufactured or both.

How to locate your CAT engine serial number

This is not your engine serial number!

We need your engine number and this tag does not give us enough information to find your replacement engine. This is the EPA tag.

epa tag does not give us the engine serial numbers

Can’t find the tag on the valve cover?

Every engine has a number stamped on the block. This video show you what to look for on your engine block.


We supply new surplus, remanufactured and good used engines for heavy duty pieces of equipment, industrial applications, off-highway and on-highway trucks. We supply CAT engines for excavators, dozers, loaders, and many other applications. View our CAT engine inventory.

How to locate your CAT engine serial number
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