Toyota Camry and Avalon 1997-2000

Belts

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INSPECTION

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.

ADJUSTMENT

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. The Nippondenso® and Burroughs tension gauges may be found at retail auto parts stores


NOTE
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. Measuring belt deflection with a ruler and straight edge

Alternator

To adjust the tension of the alternator drive belt, loosen the pivot and mounting bolts on the alternator. Using a wooden hammer handle as a wedge move the alternator one way or the other until the tension is within acceptable limits.


CAUTION
Never use a screwdriver or any other metal device such as a prybar, as a lever when adjusting the alternator belt tension!



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Fig. Loosen the pivot, lock and adjusting bolts to adjust-1MZ-FE engine shown, others similar



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Fig. Turn the adjusting lock bolt to loosen the belt

Tighten the mounting bolts securely. If a new belt has been installed, always recheck the tension after a few hundred miles of driving.

Alternator belt tension may be adjusted by means of a tension adjusting bolt on some models equipped with the 1MZ-FE engine. Loosen the alternator pivot bolt and the locking bolt, then turn the tension adjusting bolt until proper tension is achieved.

Tighten the mounting bolts securely. If a new belt has been installed, always recheck the tension after a few hundred miles of driving.

Air Conditioning Compressor

Tension on the air conditioning compressor belt is adjusted by means of an idler pulley.

  1. Loosen the lockbolt and then turn the adjusting bolt on the idler pulley until the desired tension is achieved.
  2.  
  3. Retighten the idler pulley lockbolt.
  4.  

Tighten the lockbolt securely.


NOTE
If a new belt has been installed, always recheck the tension after a few hundred miles of driving.

Power Steering Pump


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Fig. Power steering pump bolts-Avalon

On some models, tension on the power steering pump belt is adjusted by means of an idler pulley.

  1. Loosen the lockbolt and then turn the adjusting bolt on the idler pulley until the desired tension is achieved.
  2.  
  3. Retighten the idler pulley lockbolt.
  4.  

Tighten the lockbolt securely.


NOTE
If a new belt has been installed, always recheck the tension after a few hundred miles of driving.

Power steering pump belt tension on other models is adjusted by means of a tension adjusting bolt. Loosen the power steering pump pivot bolt and then turn the tension adjusting bolt until proper tension is achieved.

Tighten the mounting bolts securely. If a new belt has been installed, always recheck the tension after a few hundred miles of driving.

REMOVAL & INSTALLATION


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Fig. Listing of pulley abbreviations



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Fig. Belt routings on the 5S-FE



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Fig. Belt routings on the 1MZ-FE engine

If a belt must be replaced, the driven unit must be loosened and moved to its extreme loosest position, generally by moving it toward the center of the motor. After removing the old belt, check the pulleys for dirt or built-up material which could affect belt contact. Carefully install the new belt, remembering that it is new and unused -it may appear to be just a little too small to fit over the pulley flanges. Fit the belt over the largest pulley (usually the crankshaft pulley at the bottom center of the motor) first, then work on the smaller one(s). Gentle pressure in the direction of rotation is helpful. 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.

When buying replacement belts, remember that the fit is critical according to the length of the belt, the width of the belt, the depth of the belt and the angle or profile of the V shape (always match up old belt with new belt if possible). The belt shape should exactly match the shape of the pulley; belts that are not an exact match can cause noise, slippage and premature failure.

After the new belt is installed, draw tension on it by moving the driven unit away from the motor and tighten its mounting bolts. This is sometimes a three- or four-handed job; you may find an assistant helpful. Make sure that all the bolts you loosened get retightened and that any other loosened belts also have the correct tension. A new belt can be expected to stretch a bit after installation so be prepared to re-adjust your new belt.


NOTE
After installing a new belt, run the engine for about 5 minutes and then recheck the belt tension.

 
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