Liberty, Wrangler 2006-2007

Accessory Drive Belts

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Adjustment



Periodic drive belt tensioning is not necessary, because an automatic spring-loaded tensioner is used with these belts to maintain proper adjustment at all times. The tensioner is also useful as a wear indicator. When the belt is properly installed, the arrow on the tensioner housing must point within the acceptable range lines on the tensioner's face. If the arrow falls outside the range, either an improper belt has been installed or the belt is worn beyond its useful life span. In either case, a new belt must be installed immediately to assure proper engine operation and to prevent possible accessory damage.

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Fig. Typical drive belt automatic tensioner wear indicator

Drive Belt Routings





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Fig. Often the underhood label will display the serpentine drive belt routing



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Fig. Accessory serpentine belt routing-2.4L and 4.0L engines



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Fig. Accessory serpentine belt routing-3.7L engine

Inspection



Although many manufacturers recommend that the drive belt(s) be inspected every 30,000 miles (48,000 km) or more, it is really a good idea to check them at least once a year, or at every major fluid change. Whichever interval you choose, the belts should be checked for wear or damage. Obviously, a damaged drive belt can cause problems should it give way while the vehicle is in operation. But, improper length belts (too short or long), as well as excessively worn belts, can also cause problems. Loose accessory drive belts can lead to poor engine cooling and diminished output from the alternator, air conditioning compressor or power steering pump. A belt that is too tight places a severe strain on the driven unit and can wear out bearings quickly.

Serpentine drive belts should be inspected for rib chunking (pieces of the ribs breaking off), severe glazing, frayed cords or other visible damage. Any belt which is missing sections of 2 or more adjacent ribs which are 1 / 2 inches. (13mm) or longer must be replaced. You might want to note that serpentine belts do tend to form small cracks across the backing. If the only wear you find is in the form of one or more cracks are across the backing and NOT parallel to the ribs, the belt is still good and does not need to be replaced.

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Fig. Typical wear patterns for a serpentine drive belt

Removal & Installation



2.4L Engine

NOTE
The belt routing schematics are published from the latest information available at the time of publication. If anything differs between these schematics and the Belt Routing Label, use the schematics on Belt Routing Label. This label is located in the engine compartment.


CAUTION
Do not let tensioner arm snap back to the free arm position, as severe damage may occur to the tensioner.


NOTE
Belt tension is not adjustable. Belt adjustment is maintained by an automatic (spring load) belt tensioner

  1. Disconnect negative battery cable from battery.
  2.  
  3. Rotate belt tensioner until it contacts its stop Remove belt, then slowly rotate the tensioner into the free-arm position
  4.  

To install:

  1. Check condition of all pulleys
    CAUTION
    When installing the serpentine accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction.

  2.  
  3. Install new belt or . Route the belt around all pulleys except the idler pulley. Rotate the tensioner arm until it contacts its stop position Route the belt around the idler and slowly let the tensioner rotate into the belt. Make sure the belt is seated onto all pulleys.
  4.  
  5. With the drive belt installed, inspect the belt wear indicator. On 2.4L Engines the gap between the tang and the housing stop (measurement A) must not exceed 24 mm (.94 inches).
  6.  

2.8L Diesel
  1. Disconnect negative battery cable.
  2.  
  3. Rotate belt tensioner until it contacts its stop. Remove belt, then slowly rotate the tensioner into the free arm position.
  4.  

To install:

  1. Check condition of all pulleys.
    CAUTION
    When installing the serpentine accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction.

  2.  
  3. Install new belt. Route the belt around all pulleys except the idler pulley . Rotate the tensioner arm until it contacts its stop position. Route the belt around the idler and slowly let the tensioner rotate into the belt. Make sure the belt is seated onto all pulleys.
  4.  

3.7L Engine
  1. Disconnect negative battery cable from battery.
  2.  
  3. Rotate belt tensioner until it contacts its stop. Remove belt, then slowly rotate the tensioner into the free arm position.
  4.  

To install:

  1. Check condition of all pulleys.
    CAUTION
    When installing the serpentine accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction .

  2.  
  3. Instal