Remove Fireboard Rear Bumper; Polyurethane And Lexan Parts - Pontiac Grand Prix Service Manual

FRONT A N D REAR BUMPERS 14-7
5.
Remove back-up light assemblies (station
wagon only).
6. To remove the latch cover assembly from the
station wagon tailgate proceed as follows:
a. Open tailgate.
b. Remove inner latch cover to expose outer latch
cover bolts.
c. Remove outer latch cover.
NOTE: The bumper is filly adjustable to permit
aligning the step opening with the striker on body.
REMOVE FIREBIRD REAR BUMPER (Fig. 14-12)
Remove bolts in trunk securing rear attachment bars
to rear end sheet metal.
NOTE: Remove dampers on convertible styles.
REPLACE BUMPERS
-
ALL
1. To install, reverse the above procedures
making sure rear bumper assembly is properly
aligned.
NOTE: If splash shieldr were removed at any time
during the above operations, they must be replaced
before installing bumper.
Apply a medium bodied sealer to all Firebird rear
bumper bolts to prevent leaks at the body attaching
points.
2. Torque the attachment bolts as follows:
Face bar to attachment bar bolts - all
.
.
.
20-30
lb. ft.
Attachment bar to frame bolts
-
Tempest only
.
60-80 lb. ft.
Attachment bracket to body bolts
-
Pontiac and
Grand Prix
.
.45-60
lb. ft.
Attachment bracket to body bolts - Firebird
. .
.
25-35 lb. ft.
POLYURETHANE AND LEXAN PARTS
DESCRIPTION OF POLYURETHANE PARTS
The polyurethane bumper material will withstand
minor impacts and the resultant damage such as occur
in parking lots by recovering its original shape. The
paint film responds to impact in a similar manner
without cracking or splitting. In addition, the paint
finish may be polished for removal of surface marks as
with an acrylic paint film. If, however, an area of
damage in the bumper does not recover its shape, or
the surface is gouged, a repair system has been
developed to restore the original shape and appear-
ance of the foam base material. The polyurethane
material is used for GTO front bumpers, Pontiac front
bumper center extension and Bonneville rear bumper
applique.
The repair sequence amounts to a filling operation
with a flexible epoxy resin. After curing, the patch is
dressed to conform to the surrounding contour. The
refinish operation includes application of a glazing
compound which, after drying, is sanded smooth,
followed by the color coats and clear top coats. The
application and refinishing methods employed with
this material conformed to generally known and
accepted existing methods
--
only the material is
different.
REPAIR PROCEDURE
-
POLYURETHANE PARTS,
FILLING
Material:
Part A - Flexible Resin
Part B
-
Resin Hardener
Equipment:
Putty Knife
Squeegee
Heat Lamp(s)
#220 & #400 Sandpaper
DA Sander w/ # 80 Discs
Body File w/Holder
1. Clean the repair area with a wax, grease and
silicone removing solvent. With a DA sander adjusted
to a feathering action and fitted with a
#80
grit disc,
remove the paint film in and surrounding the area to
be filled. This is necessary because the patching
compound will adhere only to the foam base material.
2. If the surface to be repaired is cut or gouged, use the
DA sander and a clean disc to enlarge the cut or
gouged area(s). This must be done to ensure removal
of grease, oil, or dirt from the area to be contacted by
the repair material. This action should also taper the
edges of the cut to minimize the possibility of
highlighting the repair.
3. Mix the patching compound and hardening agent at
the prescribed portion
(10
to 1). The patching
compound and hardening agent should be mixed until
a uniform color is achieved.