What Kind of Caterpillar engine did I buy???

Its a C12 I believe.

 

If the ECM is on it you could take the ECM to a dealer. They should be able to scan the ecm seperately and get all the info from there.

 

It is a 3116 or 3126, not a C-12, they had 3 valve covers. Whether it's a 3116 or a 3126 depend on if it's mechanical or electronic, need to see the other side. Does it have a HEUI pump or injection pump?

 

I had to go looking on sis for some conformation, it is a 3116, the intake manifold tells the tale. The 3126's I looked at had cross flow heads on them.

 

The 3116 was usually rated at 350hp and is for meduim duty trucks, not class 8 trucks. If you mean why is it a 3116 and not a C12 or C15 or 3406.. that's because it's a small bore engine

 

After checking, the engine number 0R4565 is definitely a 3116 medium duty engine that hasn't been in production for many years.

Here is a link to some HP and torque specs for that engine.

http://www.amsautomotive.com/download/Lipe_HP_Torq.pdf

 

i think(someone correct me if im wrong) that .020 means the crank was recut so the bearings are .020 thicker. i really dont like a turned down crank, but it is a common thing to do after a spun bearing or to clean up a crank on the bearing journals.

 

You are correct. Absolutely nothing wrong with a turned crank as long as it was ground right.