DeVille, Eldorado, Seville 1999-2005

Accessory Drive Belts

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Adjustment



The drive belt is pulled by the crankshaft balancer pulley across the accessory drive component pulleys. A spring loaded drive belt tensioner keeps constant tension on the drive belt to prevent the drive belt from slipping. The drive belt tensioner arm will move when loads are applied to the drive belt by the accessory drive components and the crankshaft.

The drive belt system may have an idler pulley, which is used to add wrap to the adjacent pulleys. Some systems use an idler pulley in place of an accessory drive component when the vehicle is not equipped with the accessory.

Belt Tension 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.

Drive Belt Routings





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Fig. Serpentine drive belt routing- 4.6L (VIN 9 and Y) Engines



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Fig. Serpentine drive belt routing-GM -E and K- Bodies 4.6L engine

Removal & Installation



  1. Remove the auxiliary drive belt (if equipped).
  2.  
  3. Install a 1/2 inch drive extension into the belt drive tensioner.
  4.  
  5. Push down on the extension to release tension.
  6.  
  7. Remove the drive belt from the power steering pump.
  8.  
  9. Slowly return the tensioner to the original position.
  10.  
  11. Remove the belt.

    Click image to see an enlarged view

    Fig. Belt tensioner location

  12.  

To install:

  1. Thread the drive belt through all the pulleys except for the power steering pump and the drive belt tensioner.
  2.  
  3. Insert a 1/2 inch drive extension into the drive belt tensioner.
  4.  
  5. Push down on the tensioner and feed the belt around the tensioner wheel.
  6.  
  7. With the tension applied, complete the belt routing. Make sure the belt is properly seated in all pulleys.
  8.  
  9. Slowly return the tensioner back to its original position. This will apply tension to the drive belt.
  10.  
  11. After the installation, inspect the belt for the proper routing and the correct alignment.

    Click image to see an enlarged view

    Fig. Serpentine drive belt routing- 4.6L (VIN 9 and Y) Engines

  12.  
  13. Install the auxiliary drive belt (if equipped).
  14.  
  15. Start the engine and check for proper belt and accessory operation.
  16.  

Auxiliary Belt
  1. Loosen the auxiliary generator mounting bolts.
  2.  
  3. Remove the auxiliary drive belt.

    Click image to see an enlarged view

    Fig. Mounting bolt locations

  4.  

To install:

  1. Position the auxiliary drive belt to the pulleys.
  2.  
  3. While pulling upward on the auxiliary generator tighten the auxiliary generator adjusting bolt to 18 ft. lbs. (25 Nm).
  4.  
  5. Tighten the auxiliary generator mounting bolt to 22 ft. lbs. (30 Nm).
  6.  
  7. Start the engine and check for proper belt and accessory operation.
  8.  

 
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