How do I change the Serpentine belt on a Ford Scorpio?

DRIVE BELTS

The tensioner used by Ford consists of a large clock spring wrapped around one bolt, engaging in an arm on which a pulley is mounted. Because the action of the spring is anticlockwise, when engaged the pulley pulls the drive belt at a pressure set by the spring. As the drive belt lengthens with wear, so the spring takes up the slack. Because of the constant tension drive belts last for years, but they should be checked regularly for signs of wear. The belt might become cracked across its width, normally in the grooved face, or it may become glazed or frayed in appearance.

NOTE: If the drivebelt tensioner(s) are in good order then they will swivel about the fulcrum bolt quite easily using only medium force. However, if the tensioners have corroded in place then considerable force may be required to release the tensioner - in this case additional leverage may be required and care used to avoid injury.