GM Service Manual Online
For 1990-2009 cars only

    Object Number: 240711  Size: SH
  1. Cut the service part to appropriate length (according to dimensions), to replace removed section of the damaged rail.
  2. At the sectioning joint, measure, mark, and cut 25 mm (1 in) to 50 mm (2 in) of rail to be used as a sleeved backing plate (1) from the unused portion of the service part.

  3. Object Number: 240712  Size: SH
  4. Cut through each side of the sleeve in order to create four individual L (1) shaped pieces.
  5. Install the pieces one at a time with tack welds inside the undamaged portion of the frame rail.
  6. Trim the pieces as necessary to provide a flush fit along the butt-joint surface.
  7. Check the fit of the service part.
  8. Grind sleeve as necessary to allow for accurate alignment of the new part.
  9. Important: Retain a gap of one and one half times the metal thickness at the butt-joint when attaching the service part to the vehicle.

  10. Temporarily remove service part and prep all bare metal surfaces with a suitable weld-through primer.
  11. Stitch weld along the entire sectioning joint.
  12. Make 25 mm (1 in) welds along the seam with 25 mm (1 in) gaps between them.
  13. Complete the stitch weld. This will create a solid joint with minimal heat distortion.
  14. Prime all bare metal surfaces with PPG DP90, or an equivalent anti-corrosion primer.