Howdy y'all! I'm fairly new here, so don't be too mean...

I melted down the No.1 hole in my 1st Gen 12valve a few months back and was looking at a bore & sleeve rebuild on it, but I recently came across a fresh factory rebuild motor. It's a medium duty 5.9 12 valve Cummins with P-pump that came in a Ford CF8000 cabover box truck. It has a big Clark 5-speed behind it (I believe) that was also recently rebuilt. I can pick up they whole truck really cheap; they guy needs to get rid of it because the subdivision he lives in is complaining about it.

Before I snag it, I was wondering what the major differences are between the medium duty and light duty Cummins? I know that it has different accessory mounting locations and there is an air compressor instead of a vacuum pump. Is there anything I should be wary of if I tried to pick this up to replace my blown 1st gen?

Any help would be appreciated. Thanks!

 

I'm not sure about the differences. I'm sure there's a bit of an HP diff.. If you jump on this and don't need the air compressor, let me know.

Steve

 

all 5.9's are rated as medium duty...there are no lite duty ones

are you sure the one in this truck aint a 8.3?

 

Agreed, but I was basically trying to say that "light" duty means it came from a Dodge and "medium" duty means it came from a 2+ ton truck.

Yes, it is in fact a 5.9, not an 8.3.

 

I am unaware of any differences.....................thats a bigass tranny

 

cant say there is any differences btw them... the only cummins i know of is a heavy duty ***** to the wall cummins!!!!!

 

thats what i am talkin about