The engines are equipped with an automatic belt tensioner. No adjustment is possible or necessary.
Drive Belt Routings
Inspect the drive belt for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately.
Removal & Installation
On 2.3L and 3.0L engines, rotate the tensioner bolt clockwise and remove the belt. On 4.0L engines, rotate the tensioner bolt counterclockwise and remove the belt.