Volvo 240/740/760/780/940/960 1990-1998

Belts

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INSPECTION



See Figures 1, 2, 3, 4 and 5

Inspect the belts 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. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.

Tension of the drive belts is done by depressing a flat part of the belt, midway between two components. If the belt moves 1 / 4 - 3 / 8 of an inch, it has proper tension, if not, proceed to adjustment or replacement if the belt is old and stretched.



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Fig. Fig. 1: There are typically 3 types of accessory drive belts found on vehicles today



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Fig. Fig. 2: An example of a healthy drive belt



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Fig. Fig. 3: Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure



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Fig. Fig. 4: The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear



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Fig. Fig. 5: Installing too wide a belt can result in serious belt wear and/or breakage

ADJUSTMENT



V-Belts

See Figure 6

  1. Perform the inspection before adjusting the drive belts.
  2.  
  3. Loosen the adjusting bolt(s) and using a suitable tool, rotate the accessory in the proper direction to increase belt tension.
  4.  
  5. Check the tension while still supporting the accessory; if the tension is okay, tighten the adjusting bolts, then recheck the tension.
  6.  



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Fig. Fig. 6: Check the drive belt tension at the arrowed location on vehicles with a V-belt

Serpentine Belt

All engines with a serpentine belt use an automatic drive belt tensioner. No adjustment is necessary.

REMOVAL & INSTALLATION



V-Belts
  1. Disconnect the negative battery cable.
  2.  
  3. Loosen the mounting and adjusting bolts on the accessory and move it to its extreme loosest position, generally by moving it toward the center of the motor.
  4.  
  5. Remove the old belt. Some belts run around a third or idler pulley, which acts as an additional pivot in the belt's path. It may be possible to loosen the idler pulley as well as the main component, making your job much easier. Depending on which belt(s) you are changing, it may be necessary to loosen or remove other interfering belts to get at the one(s) you want.
  6.  
  7. Check the pulleys for dirt or built-up material which could affect belt contact.
  8.  
  9. Carefully install the new belt. Gentle pressure in the direction of rotation is helpful.
  10.  
  11. Adjust the belt tension.
  12.  
  13. Retighten the mounting bolts and recheck the tension.
  14.  
  15. Connect the negative battery cable.
  16.  

Serpentine Belt

See Figures 7, 8 and 9

  1. Disconnect the negative battery cable.
  2.  
  3. Using a suitable tool attached to the drive belt tensioner pulley, rotate the tensioner to release the tension.
  4.  
  5. Remove the drive belt from the pulley, and remove the drive belt from the accessory and crank pulleys, noting its proper routing.
  6.  

To install:
  1. Install the new belt (if being replaced) around the accessories and the crankshaft.
  2.  
  3. Rotate the automatic tensioner to release the tension and slip the belt under the tensioner pulley.
  4.  
  5. Check the belt for proper routing and tension.
  6.  
  7. Connect the negative battery cable.
  8.  



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Fig. Fig. 7: The automatic belt tensioner is tough to access; a special serpentine belt tool may be helpful



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Fig. Fig. 8: Usually a 3/8 drive tool is used to relieve the belt tensioner on the 2.9L 6-cylinder engine



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Fig. Fig. 9: Typical serpentine belt routing

 
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