on the top of the engine the is a tensioner spring held to the top by a 13 mm nut
release the nut and this releases the tensioner
you then have to work out the route for the belt
ribbed pulley to the inside of the belt flat to the outside draw the routing first if replaceing a worn belt after fitting use a 3/8 socket extension or simmalar to pull the tensioner back into place before sliding the bolt back and tightening
Ed Tucker, October 2009