GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 678091  Size: SH
  1. Loosen the drive belt idler pulley bolt.
  2. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory .
  3. Remove the drive belt idler pulley assembly (1).

Installation Procedure


    Object Number: 678091  Size: SH
  1. Install the idler pulley assembly (1) onto the generator bracket post.
  2. Important: Be sure that the idler pulley rear dust shield is fully seated against the shoulder on the generator bracket post (2) before tightening the bolt.

  3. Install the drive belt idler pulley bolt until snug.
  4. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory .
  5. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Tighten the drive belt idler pulley bolt.
  7. Tighten
    Tighten the drive belt idler pulley bolt to 50 N·m (37 lb ft).