Check the drive belts every 15,000 miles or twelve months for evidence of wear such as cracking, fraying, and incorrect tension. Determine belt tension at a point halfway between the pulleys by pressing on the belt with moderate thumb pressure. If the distance between the pulleys (measured at the center of the pulley) is 330 and 19400mm (13 and 1916 in.), the belt should deflect 13mm ( 1 / 2 in.) at the halfway point of its longest straight run; 6mm ( 1 / 4 in.) if the distance is 178300mm (712 in.). If the defection is found to be too much or too little, loosen the mounting bolts and make the adjustments.
Before you attempt to adjust any of your engine's belts, you should take an old rag soaked in solvent and clean the mounting bolts of any road grime which has accumulated there. On some of the harder-to-reach bolts, an application of penetrating oil will make them easier to loosen. When you're adjusting belts, especially on 4 cylinder engines with air conditioning and power steering, it would be especially helpful to have a variety of socket extensions and universals to get to those hard-to-reach bolts.
After 1989, the V6 engines are equipped with a serpentine belt and automatic belt tensioner. The tension is maintained by a spring loaded pulley/tensioner. The indicator mark on the moveable portion of the tensioner must be within the limits of the slotted area on the stationary portion of the tensioner. Any reading outside the limits indicates either a defective belt or tensioner.
To remove the belt , install a 1 / 2 in. ratchet handle into the square slot in the tensioner and move far enough to slide the belt off the pulleys. Mark the belt routing for installation.