right its nothing to do with the cambelt it self, i checked the tension and its fine, so started it up without the alternator belt on, and it sounds fine, no knocking, no whining, sounds good, but when i put it back on it knocks and whines again.

so something to do with which runs on the alt belt, any ideas? i really need to get this sorted the car is sold and needs to be collected but i need to fix it first, only thing i could possibly say is the belt looks a bit jumpy, he belt it self seems ok, worn but wouldn make a tap sound, but the belt seems to wobble about a bit, tensioner feels ok.