Water pump replacement on a 3126 Caterpillar up in Taylor, MI. Instead of running the water pump off of the main serpentine belt, Cat decided it was a good idea to hide the water pump and run it off of a V-belt with a manual tensioner which is often overlooked and somewhat difficult to tension inside of a truck frame. The belt stretches over time and eventually the engine begins overheating. The two bolts holding the tensioner freeze up in the aluminum and can be a real pain to adjust if they ha