Toyota Previa 1991-1997 Repair Information

Belts

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INSPECTION



See Figures 1 through 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.



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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

REMOVAL, INSTALLATION & ADJUSTMENT



See Figures 6 through 10

Belts are normally adjusted by loosening the bolts of the accessory being driven and moving that accessory on its pivot points until the proper tension is applied to the belt. The accessory is held in this position while the bolts are tightened. To determine proper belt tension, you can purchase a belt tension gauge or simply use the deflection method. To determine deflection, press inward on the belt at the mid-point of its longest straight run. The belt should deflect (move inward) 3 / 8 - 1 / 2 in. (10-13mm). Some long V-belts and most serpentine belts have idler pulleys which are used for adjusting purposes. Just loosen the idler pulley and move it to take up or release tension on the belt.



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Fig. Fig. 6: The Nippondenso and Burroughs testers are available through dealers and may be found at retail auto parts stores



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Fig. Fig. 7: When installing the new or used belt, make certain the belt is installed in the grooves correctly

Proper belt tension is important because it will allow the belt to run quietly and will maximize the belt's service life.



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Fig. Fig. 8: Listing of pulley abbreviations



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Fig. Fig. 9: Belt routings on the 2TZ-FE engine



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Fig. Fig. 10: Belt routings on the 2TZ-FZE engine

Alternator/Power Steering Drive Belt
  1. Remove the air duct.
  2.  
  3. Loosen the No. 1 idler pulley nut and adjusting bolt.
  4.  
  5. Remove the drive belt from the engine.
  6.  

To install:
  1. Install the drive belt and adjust the belt with the adjusting bolt. Adjust the drive belt to the following specifications:

    New belt-160-180 ft. lbs.
     
    Used belt-115-135 ft. lbs.
     

  2.  
  3. Tighten the No. 1 idler pulley nut.
  4.  
  5. Install the air duct.
  6.  

Supercharger Drive Belt
  1. Remove the alternator/power steering drive belt from the engine.
  2.  
  3. Loosen the No. 2 idler pulley nut and adjusting bolt.
  4.  
  5. Remove the drive belt from the supercharger.
  6.  

To install:
  1. Install the drive belt to the supercharger.
  2.  
  3. Tighten the adjusting bolt and adjust the drive belt to the following specifications:

    New belt-160-180 ft. lbs.
     
    Used belt-115-135 ft. lbs.
     

  4.  
  5. Install the alternator/power steering drive belt to the engine.
  6.  

A/C Compressor Drive Belt
  1. Remove the alternator/power steering drive belt.
  2.  
  3. Remove the supercharger drive belt.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Loosen the idler pulley lock nut.
  8.  
  9. Loosen the adjusting bolt to the idler pulley and remove the compressor drive belt.
  10.  

To install:
  1. Install the compressor drive belt to the engine and tighten the adjusting bolt to the idler pulley. Drive belt tension is as follows:

    New belt-145-185 lbs.
     
    Used belt-110-150 lbs.
     

  2.  
  3. Tighten the idler pulley lock nut to 29 ft. lbs. (39 Nm).
  4.  
  5. Install the supercharger drive belt.
  6.  
  7. Install the alternator/power steering drive belt.
  8.  
  9. Recheck belt tension.
  10.  

 
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