The serpentine belt system in a Jeep 4.0L powers every auxiliary component under the hood. The self-tensioner is responsible for keeping the serpentine belt tight so that all the components function properly. The serpentine belt can be damaged if the self-tensioner is too loose or too tight. It is important to adjust the self-tensioner if the serpentine belt is squeaking, frayed, or if the belt is damaged.
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Things you need
- 13mm open-ended wrench
Open the bonnet and place the gloves on your hands.
Locate the self-tensioner along the pulley system. The self-tensioner is held on by four 13mm bolts, one of which is bolted to a sliding bracket. The bolt on the sliding bracket is used to tighten and loosen the self-tensioner.
Attach the 13mm open-ended wrench to each of the four bolts and loosen them. Slide the bolt that is located on the bracket down and away from the centre of the Jeep.
Check the belt for damage and replace if necessary. Move the self-tensioner to make the belt tight and eliminate side-to-side play from the belt. The belt should not be able to move more than 0.5 inches when the tensioner is properly applied to a torque specification of 30 foot-pounds.
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