You don't - no adjustment. Remove wheel, take out inner wing [three bolts] take off radiator fan. Remove cam sensor. Cut old belt Fit new one to Crankshaft pulley and Alternator Pully push belt into water pump pulley nearest bottom of Crankshaft pully and fasten in place with couple of zip ties through pullet slots. Use socket or pump pliers to turn crank shaft - pulling belt onto water pump pulley cut off zip ties. Job done! Takes about 30 mins or so.
