Removal Procedure
Important: The Rear Compartment Panel is manufactured with section lines to indicate
the proper sectioning location of the service part. Check all the bonding
areas of the Rear Compartment Panel (tub). If adhesive is cracked or broken
loose from the rails or the tub, complete tub replacement is recommended.
Important: The frame rails and bumper impact bars must be serviced as required,
and returned to three-dimensional coordinates before any SMC repairs are attempted.
- Visually inspect and restore as much of the damage as possible
to specifications using three-dimensional measuring procedures.
Important: Make sure the fuel inlet is sealed before proceeding with repair procedure.
- Remove all panels, components, and interior trim located in the
rear compartment.Save any and all brackets, mounting studs, and accessories
for transfer to the new rear compartment panel.
- Remove both rear quarter panels and Rear Compartment Panel Frame
(rear surround).
- Identify the section line
etched in the floor of the rear compartment panel.
Important: The etched line is in the floor only, the line must be continued straight
up both side-walls of the tub to complete the cuts.
- Remove or reposition components on the bottom side of the tub
to avoid damage where sectioning procedures are being performed.
Important: Take care not to damage the frame rails when sectioning the rear compartment
panel.
- Cut along the section line and remove the damaged panel.
Installation Procedure
- Remove all remaining adhesive, and scuff all bonding surfaces
to ensure proper adhesion.
- Clean and prepare all bonding surfaces as necessary.
- Prime all bare metal surfaces with an approved anti-corrosion
primer per GM P/N 4901M-D refinish manual. Do not top-coat any
bonding surface.
- Cut the replacement rear
compartment panel along the section line to create service part.
- Create 50 mm (2 in) wide backing plates to be installed
along the bottom side of the section joint.
Important: Use US Chemical and Plastics 82006B System 2000 Structural Adhesive,
a PLIOGRIP®; Adhesive manufactured by Ashland Chemical Company, or equivalent.
Note the 3 minute working time and 15 minute cure time. Use
this fast setup adhesive when working with backing plate strips.
- Apply structural adhesive to the backing plate strips and secure
along the section joint using screws.
- Remove excess adhesive from the service part mounting area.
Important: Use US Chemical and Plastics 7779/300B, a PLIOGRIP®; Adhesive manufactured
by Ashland Chemical Company, or equivalent. Note the 10 minute working
time and 1 hour cure time.
- Temporarily install the modified service panel and check for proper
fit and alignment
- Remove service part.
- Apply adhesive to the
extended portion of the mating flange created from the backing strips, and
to the frame rails, and rear bumper impact bar as necessary.
- Install the modified service part and press down firmly to wet-out
the adhesive.
Important: Use fasteners no longer than 20 mm (¾ in) in length.
- Use two close-end rivets in areas indicated along the bond line
to hold the tub to the rails while adhesive cures.
- Allow to cure according to adhesive manufacturer recommendations.
- After structural adhesive is fully cured, bevel butt-joint edges
to prep for reinforcement and refinishing of the interior joint.
- Apply Goodwrench Structural Bonding Adhesive (GM P/N 12345726)
to the entire joint area extending across the cut lines and across the backer,
using tacky mesh tape or an equivalent reinforcement matting. Allow to cure
as necessary.
- Prepare the repair areas as necessary to resemble OEM appearance.
- Refinish repair areas. Do not combine paint systems. Always refer
to paint manufacturers recommendations.
- Install all related panels and components.