First, release the tension on the belt with a 1/2" breakover or ratchet to remove the belt. You don't need a socket, the square part is what is needed, there is a square hole for it. Then simply take a (I believe a 15mm but I know its metric) socket or wrench and unscrew the bolt and the whole thing should come off the front of the engine. Is that engine a turbo-diesel 7.3L Indirect Injected engine? My Dad has a 1993 IDI turbo diesel non-powerstroke that I've worked on many times. Other than the tranny and rear differential, there's not much I haven't had the chance to work on.