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Drive Belt Tensioner Diagnosis

Fig 1: Diagnosing Drive Belt Tensioner
G01643594Courtesy of GENERAL MOTORS CORP.
NOTE: Allowing the drive belt tensioner to snap into the free position may result in damage to the tensioner.

Important:  When the engine is operating the belt tensioner arm will move. Do not replace the belt tensioner because of movement in the belt tensioner arm.

  1. Remove the drive belt. Refer to DRIVE BELT REPLACEMENT  .
  2. Position a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise
  3. Move the drive belt tensioner through it's full travel.
    • The movement should feel smooth.
    • There should be no binding.
    • The tensioner should return freely.
  4. If any binding is observed, replace the drive belt tensioner. Refer to DRIVE BELT TENSIONER REPLACEMENT  .
  5. Install the drive belt. Refer to DRIVE BELT REPLACEMENT  .
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