Lexus RX300, 330 3 2000-06

Accessory Drive Belts

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Adjustment



  1. To adjust the A/C compressor-crankshaft pulley belt:
    1. Loosen bolt A.
    2.  
    3. Loosen bolt B.
    4.  
    5. Apply drive belt tension by turning bolt C. The belt tension should be 160-180 lbs. for a new belt, or 115-135 lbs. for a used belt.
      NOTE
      New belt refers to a belt which has been used for less than 5 minutes on a running engine. Used belt refers to a belt which has been used for 5 minutes or more on a running engine.



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      Fig. A/C compressor-crankshaft pulley belt

    6.  
    7. Tighten bolt A to 43 ft. lbs. (58 Nm).
    8.  
    9. Tighten bolt B to 13 ft. lbs. (18 Nm).
    10.  

  2.  
  3. To adjust the power steering (vane) pump belt:
    1. Loosen bolt A.
    2.  
    3. Loosen bolt B.
    4.  
    5. Apply drive belt tension by turning bolt C. The belt tension should be 132-154 lbs. for a new belt, or 55-88 lbs. for a used belt.
      NOTE
      New belt refers to a belt which has been used for less than 5 minutes on a running engine. Used belt refers to a belt which has been used for 5 minutes or more on a running engine.

    6.  
    7. Tighten bolt A to 32 ft. lbs. (43 Nm).
    8.  
    9. Tighten bolt B to 32 ft. lbs. (43 Nm).
    10.  

  4.  

Drive Belt Routings





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Fig. Accessory drive belt routing -3.0L engine



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Fig. Accessory V-belt routing-2.0L engine



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Fig. Accessory V-belt routing-2.4L engine



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Fig. Accessory V-belt routing-2.7L engine



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Fig. Accessory V-belt routing-3.0L engine



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Fig. Accessory V-belt routing-3.4L engine



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Fig. Accessory drive belt routing -RX300

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.


NOTE
There are two ways to inspect the belt tension: the Belt Tension Gauge Method and the Deflection Method. Both are outlined below.

Belt Tension Gauge Method

  1. Attach a suitable belt tension gauge to the belt where shown in the accompanying illustration, and measure the tension of the belt. Follow the manufacture's instructions. If the belt is worn or damaged, replace it.
  2.  
  3. For the A/C compressor-alternator belt, the tension should be:
    1. Used Belt: 66-110 lbs. (294-490 N)
    2.  
    3. New Belt: 139-192 lbs. (617-853 N)
    4.  

  4.  
  5. For the power steering (vane) pump belt, the tension should be:
    1. Used Belt: 73-117 lbs. (323-513 N)
    2.  
    3. New Belt: 146-190 lbs. (647-843 N)
    4.  

  6.  
  7. If you installed a new belt, run the engine for 5 minutes, then readjust the belt to the used belt specifications.

    Click image to see an enlarged view

    Fig. Measuring points for belt tension/deflection

  8.  

Deflection Method

  1. Apply a force of 22 lbs. (98 N) and measure the deflection between the points shown in the accompanying figure.
  2.  
  3. For the A/C compressor-alternator belt, the deflection should be: