Question: I've had problems with my alternator belt jumping off the pulley system and have found that the idler pulley was worn and was causing the fault. Before realising this I put the belt back on only for it to jump off again and this time the idler pulley has sheared off. Having done various work to the car with the aid of the Haynes Manual I always refer to this however it doesnt seem to mention how to change the idler pulley - it looks like it should be a straight forward unbolt the old pulley and bolt on the new one, however does this need to be tightened to a specific torque and/or is this as simple as it looks?
Answer: Just get the bolt hand tight and thats all. Once that is done you should be fine. Look in the FAQS pages for the belt mod that eliminates the pulley. This seems to be the best long term fix to prevent the issue from happening again. Easy to do, works great.