Isuzu Ascender 2003-05

Accessory Drive Belts

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Adjustment



Engine drive belt adjustment is not necessary. The drive belt has an automatic belt tensioner.

Drive Belt Routings





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Fig. Accessory serpentine belt routing-4.2L engines



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Fig. Accessory drive belt and A/C belt routing-5.3L engines



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Fig. Accessory serpentine belt routing-4.2L engines



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Fig. Accessory drive belt and A/C belt routing-5.3L engines

Inspection



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



4.2L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Install 3/8 inch breaker bar on the drive belt tensioner arm and turn the breaker bar clockwise enough to relieve the tension on the drive belt.
  4.  
  5. Remove the drive belt.
  6.  
  7. Release the tension on the tensioner arm.
  8.  

To install:

  1. Route the drive belt over all the pulleys except the drive belt tensioner pulley.
  2.  
  3. Install the 3/8 inch breaker bar on the drive belt tensioner arm and turn the breaker bar clockwise.
  4.  
  5. Install the drive belt over the drive belt tensioner pulley.
  6.  
  7. Slowly release the tension to the drive belt tensioner arm.
  8.  
  9. Inspect for proper installation of the drive belt on the pulleys.
  10.  
  11. Connect the negative battery cable.
  12.  

5.3L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner resonator outlet duct.
  4.  
  5. Install a breaker bar with hex-head socket to the drive belt tensioner bolt.
  6.  
  7. Rotate the drive belt tensioner clockwise in order to relieve tension on the belt.
  8.  
  9. Remove the belt from the generator pulley.
  10.  
  11. Slowly release the tension on the drive belt tensioner.
  12.  
  13. Remove the breaker bar and socket and from the drive belt tensioner bolt.
  14.  
  15. Remove the belt from the remaining pulleys.
  16.  
  17. Clean and inspect the belt surfaces of all the pulleys.
  18.  

To install:

  1. Route the drive belt around all the pulleys except the generator pulley.
  2.  
  3. Install the breaker bar with hex-head socket to the belt tensioner bolt.
  4.  
  5. Rotate the belt tensioner clockwise in order to relieve the tension on the belt.
  6.  
  7. Install the drive belt on the generator pulley.
  8.  
  9. Slowly release the tension on the belt tensioner.
  10.  
  11. Remove the breaker bar and socket from the belt tensioner bolt.
  12.  
  13. Inspect the drive belt for proper installation and alignment.
  14.  
  15. Install the air cleaner resonator outlet duct.
  16.  
  17. Connect the negative battery cable.
  18.  

 
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