2000-2005 Ford Excursion, Expedition and Lincoln Navigator
Put your vehicle in park, make sure the engine is off and apply the emergency brake.
Remove your air breather to give you room to work with.
Rotate the tensioner pulley clockwise creating slack on the belt and slip the belt off of one of the other pulleys.
Be sure to inspect all of your other pulleys and make sure they are clean and not damaged.
Installation is reverse of removal. Route the belt according to the diagram provided leaving the closest pulley to the tensioner for last. Maintain tension on the belt with your and, rotate the tensioner and slip the belt on the last pulley.
Be sure to double check your belt making sure it is routed correctly and is each pulley correctly. Be sure to check the tension of your belt to assure the tensioner pulley does not need replaced as well.