GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 637620  Size: SH
  1. Visually inspect and restore as much of the damage as possible to factory specifications.
  2. Remove all of the related panels and the components.
  3. Remove any excess sealer surrounding the hinge.

  4. Object Number: 637623  Size: SH
  5. Scribe the location of the hinge on the hinge pillar.

  6. Object Number: 637626  Size: SH
  7. Locate and drill out all necessary factory welds in the hinge access panel.

  8. Object Number: 637628  Size: SH
  9. Pry the access door out in order to gain access to the back side of the hinge.

  10. Object Number: 637630  Size: SH
  11. Locate and drill the center of the hinge welds using a 13 mm (1/2 in) drill bit or the equivalent.

  12. Object Number: 637632  Size: SH
  13. If necessary, use a chisel in order to separate the hinge from the pillar.

  14. Object Number: 637634  Size: SH
  15. Remove the hinge.

Installation Procedure


    Object Number: 637636  Size: SH
  1. Clean and prepare the pillar surfaces in order to ensure a flush fit of the service hinge and the fasteners.

  2. Object Number: 637639  Size: SH

    Important: Prior to refinishing, refer to GM 4901MD-99 Refinish Manual for recommended products. Do not combine paint systems. Refer to paint manufacturer's recommendations.

  3. Apply an approved anti-corrosion primer.
  4. Apply full-body caulk to the entire hinge mounting surface.

  5. Object Number: 637641  Size: SH
  6. Position the service hinge within the scribe marks on the pillar.
  7. 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.

  8. Install the hinge fasteners.
  9. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  10. Refinish the metal surfaces as necessary.
  11. Align and install all of the related panels and the components.