Remove the timing belt

Fig 1: Identifying Belt Between Intake Camshaft Pulley, Idler Pulley And Crankshaft

Courtesy of VOLVO CARS OF NORTH AMERICA.

Slacken off the center screw for the belt tensioner slightly
Hold the center screw still. Turn the tensioner eccentric clockwise to 10 o'clock using a 6 mm Allen key.
Remove the timing belt.