How do you replace the serpentine belt in a 1997 F350 powerstroke diesel?

u will need a serpentine belt tool or a 15 mm socket on a 1/2 inch breaker bar. release the tension on the belt and remove from the alternator pulley. generally u have to pull the tensioner to the left to relaes tension on the belt. once the belt is removed from the pulley slowly let the tensioner go till it stops moving. u will have to remove the upper radiator hose to remove belt completely. put new belt around hose and reinstall. run belt as removed. and your done