Toyota 4Runner 2001-06

Accessory Drive Belts

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Adjustment



1gr-FE And 2uz-FE Engines

These vehicles are equipped with an belt tensioner which coordinates belt tension automatically and does not need manual adjustment. With the belt installed, check that the mark on the belt tensioner is with the -B- range as shown in the illustration.

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Fig. To ensure proper belt tension, check that the mark is within the -B- range as shown

5VZ-E Engine


Alternator: New-160 lbs. (712 N) Used-100 lbs. (445 N)
 
Power Steering: New-158 lbs. (702 N) Used-103 lbs. (458 N)
 
Air Conditioning: New-160 lbs. (712 N) Used-100 lbs. (445 N)
 


NOTE
This engine uses three individual accessory drive belts, identified as the Alternator drive belt, A/C drive belt and Power Steering pump drive belt. The adjustment procedure is the same for all.

  1. Loosen the lock nut(s) completely and then temporally tighten to 22 inch lbs. (2.5 Nm).
  2.  
  3. Use the adjusting bolt to adjust the belt tension:
    1. A/C and Alternator new belt: 145-185 lbs.
    2.  
    3. A/C and Alternator used belt: 75-125 lbs.
    4.  
    5. Power steering new belt: 135-180 lbs.
    6.  
    7. Power steering used belt: 85-120 lbs.
      NOTE
      A used belt is defined by more than 5 minutes of use.

    8.  

  4.  
  5. Tighten the lock nut(s) to 29 ft. lbs. (39 Nm).

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    Fig. Use the adjusting bolt to adjust the A/C drive belt tension-3.4L (5VZ-FE) Engine



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    Fig. Use the adjusting bolt (C) to adjust the Power Steering pump drive belt tension-3.4L (5VZ-FE) Engine

  6.  

Drive Belt Routings





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Fig. Accessory drive belt routing -3.4L engine



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Fig. Accessory drive belt routing -3.4L engine



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Fig. Accessory drive belt routing-4.0L engine



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Fig. Accessory drive belt routing-4.7L engine

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.

Visually check the belt for excessive wear and frayed cords. Cracks on the rib side of a belt are considered acceptable. If the belt has chunks missing from the ribs, it should be replaced. If any defect has been found, replace the drive belt. Ensure the belt fits properly in the ribbed grooves. Check with your hand to confirm that the belt has not slipped out of the groove on the bottom of the pulley.

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Fig. Examples of excessive wear and chunks missing from the ribs of the accessory drive belt



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Fig. Check to ensure the accessory drive belt is seated properly on the pulley.

Removal & Installation



1gr-FE And 2uz-FE Engines
  1. Loosen the belt tension by turning the belt tensioner counterclockwise, and remove the accessory drive belt.
    NOTE
    The pulley bolt for the belt tensioner has a left-hand thread.

  2.  

To install:

  1. Set the drive belt onto every pulley except the top idler pulley.
  2.  
  3. Turn the belt tensioner counterclockwise to release the tension.
  4.  
  5. Install the accessory drive belt over the top idler pulley.
  6.  

5vz-FE Engine
  1. Loosen the lock bolts for the pulley.
  2.  
  3. Loosen the adjusting bolt for the belt.
  4.  
  5. Remove the accessory drive belt.
  6.  

To install:

  1. Install the accessory drive to the proper pulleys.
  2.  
  3. Temporally tighten the lock bolt(s) to 22 inch lbs. (2.5 Nm).
  4.  
  5. Verify the belt tension using a suitable belt tension gauge.
  6.  
  7. Tighten the pulley lock bolt(s) to 29 ft. lbs. (39 Nm).
  8.  

 
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