Belt Adjustment
Inspect belt for fraying. If fraying has occurred, ensure belt and tensioner are aligned properly. See Fig 1. If tensioner has reached its limit of travel, belt is excessively stretched and replacement of belt is required. If excessive noise is noticed from tensioner or idler, check for possible bearing failure. With the engine running, visually observe the grooves in the pulleys (not the pulley flanges or the pulley forward faces) for excessive wobble. Install new components as necessary. Check all accessories, mounting brackets, and the drive belt tensioner for any interference that would prevent the components from mounting correctly. Correct any interference condition and recheck the drive belt tracking. Tighten all accessories, mounting brackets, and the drive belt tensioner retaining hardware to specification. Recheck the drive belt tracking.
Automatic tensioners are calibrated to provide correct amount of tension to belt for an accessory drive system. Unless a spring within tensioner assembly breaks, or some other mechanical part of tensioner fails, there is no need to check tensioner for correct tension. Tension is within specification if tensioner pointer is within indicator markings. See Fig 1.
Belt tension is controlled by an automatic belt tensioner and is not adjustable. Tensioners are shown in free-state position against arm travel stops. See Fig 2 and Fig 3