How do you replace the alternator on a 1991 Audi 100?

It's easy Dissconnect battery.Dissconnect wires from back.Dissconnect air pipe the little nuts(8mm)may need replacing. lossen off the top bolts a tad these act as the hinge. Remove the adjustment plate thing note the coged bolt this lets you get tension into the belt without using a lever as on other cars. Remove the top bolts and it drops free. next clamp the cooling fins in a vice(they may bend a little) so as to remove the pully wheel.On new alternator fit pully and fan,ensure fins are straight tap with hammmer if not, then fit. Best use new belt and lightly grease all bolts