The alternator belt on the Honda Civic models is driven by the crankshaft pulley. Every time that the crankshaft pulley turns, the belt turns the alternator pulley. The alternator belt is held on tight to the alternator pulley and the crankshaft pulley by an adjustment bracket. The adjustment bracket controls the tension of the alternator belt. Once the alternator belt starts to crack, it will need to be replaced before it breaks.
Park the Honda Civic on a level surface and pull the parking brake out. Open the bonnet.
Locate the alternator belt on the front of the engine. There is an adjustment pulley below the alternator that has a locking bolt in the centre of the pulley and a adjustment bolt at the end of the pulley.
Loosen the locking nut in the centre of the adjustment pulley with the breaker bar. Then, turn the adjustment bolt at the end of the adjustment pulley counterclockwise to loosen the tension on the alternator belt. Once the alternator belt is loose, remove the belt from the pulleys.
Slide the new alternator belt around the pulleys. Screw the adjustment bolt at the end of the adjustment pulley clockwise to tighten the alternator belt. To check the tension of the belt, push in on the belt with your hand. A properly tensioned belt should have no more than one inch of slack in it.
Tighten the locking nut in the centre of the adjustment bracket. Crank the engine and let it run for about one minute. Turn the engine off and recheck the tension on the belt with your hand. Close the bonnet. Job complete.
Most vehicle manufacturers highly recommend replacing any belt that has more than three cracks in a one-square-inch area.
Always make sure that the belt is tight and secure around the pulleys before driving the car. The belt could come off while you are driving down the road and leave you stranded.