GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 39914 Serpentine Belt Tensioner Unloader

Removal Procedure


    Object Number: 1309849  Size: SH
  1. Using J 39914 rotate the drive belt tensioner (8) to release the tension on the drive belt.
  2. Remove the drive belt from the right idler pulley (2).
  3. Carefully release J 39914 to relieve the drive belt tensioner spring tension.
  4. Remove J 39914 from the drive belt tensioner (8).
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  6. Remove the right front wheel. Refer to Tire and Wheel Removal and Installation.
  7. Remove the engine splash shield. Refer to Engine Splash Shield Replacement.

  8. Object Number: 1317163  Size: SH
  9. Loosen the lower belt idler pulley bolt.
  10. Remove the lower belt idler pulley and bolt from the engine front cover.

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1317163  Size: SH
  1. Install the lower belt idler pulley and bolt to the engine cover and tighten the bolt to 50 N·m (37 lb ft).
  2. Install the engine splash shield. Refer to Engine Splash Shield Replacement.
  3. Install the right front wheel. Refer to Tire and Wheel Removal and Installation.
  4. Lower the vehicle.

  5. Object Number: 1309849  Size: SH
  6. Insure the drive belt is properly centered on all the pulleys except the right idler pulley (3).
  7. Using J 39914 rotate the drive belt tensioner away from the drive belt.
  8. Install the drive belt to the right idler pulley (2).
  9. Carefully release J 39914 allowing the drive belt tensioner (8) to come in contact with the drive belt.
  10. Remove J 39914 from the drive belt tensioner (8).
  11. Inspect the drive belt to insure the belt is properly centered on all the pulleys (1-8).