1693 caterpillar

Many years ago we had a 1693T (no aftercooler) 325 hp in a standard cab Pete twin-screw pulling a 9500 gal fuel tank. One driver, empty half the time. It ran 860,000 miles before we sold it - sold to a wrecker, I think, who took one of the driving axles out and ran it on - don't know how long. The only maintenance on it other than fluid changes and greasing, etc. was cleaning the injector cups one time, at about 600,000 miles. Oh, yeah - the rig cost back in 1972 was $26,000! And yes about 5 mpg was tops.
-Retired now-

 

Here is what I think.
3406 is pushrod
Big can is overhead cam
Series 60 is overhead cam
Isx is overhead cam so is N14
I've never drove big cams, or 3406 but right now I'm driving a mx13 paccar, it is pushrod.
Pushrod is more torque down low, overhead cam is better breathing up high in the rpms.
Pushrod is more compact, lightweight, and easy to repair vs overhead cam.

I'm just a driver who wishes I could get some time doing engines, so don't take me to seriously.

 

Um the 855 line is not overhead cam, the ISX was first offering from Cummins to have OHC.

Starting with the 3406E cat went to OHC, only the mechanical 3406 is cam in block.

 

I stand corrected. Thankyou.

 

My 85 3406b in my k100e aerodyne .
Loved it !

 

Pretty much lol.....good motor and cheap to maintain.....but...but ....slick...it don't have that expensive yellow paint

 

We can fix that for you though @slickWillie1980

 

Ha lmao

 

Dont let snowman fool you, 855 is in his blood. LoL

 

I think anyone old enough to have bought a new 425 cat from the mid 80s to the early 90s. Can, make the argument that the 3406b mechanical was the best truck engine ever produced.
like @bzinger said, Loved it !