SECTION 14
INDEX
Page
General Description—Chevrolet 14-1
Service Operations 14-1
Front Bumper Assembly 14-1
Removal 14-1
Disassembly . 14-1
Assembly „ 14-1
Installation . . 14-1
Bear Bumper Assembly 14-2
Removal .' 14-2
Disassembly . 14-2
Assembly 14-2
Installation 14-2
General Description—Chevelle 14-2
Service Operations 14-2
Front Bumper Assembly 14-2
Removal 14-2
Disassembly 14-3
Assembly 14-3
Installation 14-3
Rear Bumper Assembly 14-3
Removal . . 14-3
Disassembly 14-3
Assembly . . . . 14-3
Installation 14-3
General Description—Chevy II 14-3
Service Operations 14-3
Front Bumper Assembly 14-3
Removal 14-3
Page
Disassembly 14-4
Assembly 14-4
Installation . 14-4
Rear Bumper Assembly . 14-4
Removal 14-4
Disassembly 14-4
Assembly ..................... 14-4
Installation 14-4
General Description—Corvette 14-4
Service Operations . 14-4
Front Bumper Assembly . . 14-4
Removal 14-4
Installation . . 14-5
Rear Bumper Assembly 14-5
Removal 14-5
Installation 14-5
General Description—Camaro 14-6
Service Operations . 14-6
Front Bumper Assembly 14-6
Removal. . 14-6
Disassembly 14-6
Assembly 14-6
Installation 14-6
Rear Bumper Assembly 14-6
Removal . 14-6
Disassembly 14-6
Assembly 14-6
Installation 14-7
GENERAL DESCRIPTION-CHEVROLET
The front bumper is a new, full width, three-piece
design consisting of a center and two end face bars.
Two holes are pierced in the center face bar for the
parking lamps. The bumper attaching brackets are
lengthened to attach in common with new front bumper
diagonal braces.
The rear bumper is a new three-piece design similar
in general appearance to the 1966 design. Caprice mod-
els have pierced holes in the center portion of the bumper
for the back-up lamps with the other models incorporat-
ing the back-up, lamps with the tail lamps. The fuel tank
filler door assembly remains the same as the 1966
models.
SERVICE OPERATIONS
FRONT BUMPER ASSEMBLY (Fig. 1)
Removal
1.
Raise and support front end of vehicle.
2.
Disconnect parking lamp wiring.
3.
Remove bolts attaching bumper brackets and braces
to frame.
4.
Remove bumper from vehicle.
Disassembly
1.
Remove bolts attaching brackets and braces to
bumper.
2.
Separate face bar sections by removing two bolts at
each joint.
3.
Remove screws attaching each parking lamp assem-
bly to center face bar and remove parking lamps.
Assembly
Attach both parking lamps to center face bar and
tighten bolts firmly. Assemble the front bumper follow-
ing the disassembly procedure in reverse order. Except
for parking lamp attachments, install all bolts loosely; do
not tighten any bolts until all bolts are installed.
Installation
1.
Position assembled bumper on frame horns aligning
holes in bumper brackets and braces with those in
frame.
2.
Install bolts, lock washers, and nuts; do not tighten.
Note that eight sided adjustment washers (fig. 1) are
CHEVROLET O-
SERVICE
ACCESSORIES 15-14
Deflate system through service valve and disconnect
line at pressure regulator valve. Install test gauge on
regulator valve high pressure fitting.
Inflate system through service valve to maximum
available pressure.
NOTE: If available pressure is less than 140
psi,
start engine to build-up reservoir to this
pressure.
Regulated pressure should build-up to and hold
steady at 100-130 psi on test gauge.
Check regulated pressure by momentarily (not more
than one second) depressing valve core on test gauge
arid observe gauge reading.
If regulated pressure now reads less than 100 psi,
replace regulator assembly.
If regulated pressure exceeds 130 psi, replace regu-
lator assembly.
Control Valve Test
Exhaust (Superlifts Inflated)
1.
Disconnect control valve lever from link.
2.
Hold lever down in exhaust position until Superlifts
deflate or for a minimum of 18 seconds.
3.
If Superlifts deflate, perform Intake Check.
4.
If Superlifts do not deflate, remove exhaust adapter
from control valve and hold lever down as in Step 2.
Replace adapter, O-ring and filter if this deflates
Superlifts.
5.
Replace control valve if none of the above steps solve
problem.
Intake (Reservoir Pressure 125 psi Minimum)
1.
Disconnect overtravel lever from link.
2.
Hold lever up in intake position until Superlifts in-
Fig.
16 - Assembly Leak Test Preparation
flate or for a minimum of fifteen seconds.
3.
If Superlifts inflate and hold, proceed to Time Delay
Check. '•
4.
If Superlifts inflate and then leak down, perform leak
test on lines and fittings and then on Superlifts and
control valve. Repair or replace as indicated.
Time Delay Test (Reservoir Pressure 125 psi Minimum)
1.
Record rear trim height of empty car (rear bumper
to ground).
2.
Add weight equivalent to two passenger load to rear
of car. Car should begin to level in 4-18 seconds.
3.
Remove weight. After 4-18 seconds car should begin
to settle.
4.
Replace valve if time delay is not within the 4-18
seconds.
Trim Adjustment—On Car
Trim adjustment should be performed with a full fuel
tank (or the equivalent in load at the rate of 6 lbs
./gal-
lon)
,
but no other load.
Abbreviated Adjustment
1.
Fill the compressor at the service valve with the
available air line pressure.
2.
Disconnect link from height control valve lever.
Move the height control valve lever upward until air
fills the Superlifts.
3.
Move lever downward and hold until air stops escap-
ing from the exhaust port of the height control valve.
The Superlifts will now automatically hold 8 to 15
PSI.
;
4.
Let lever go to its neutral position> and loosen the
lever adjustment nut.
5.
Assemble the link to the height control valve lever
and tighten the lever adjustment nut.
NOTE: Do not move control valve lever and
overtravel body while tightening nut.
Leak Tests
Compressor, Reservoir and Regulator
1.
Remove assembly intact.
2.
Connect test gauge to regulator. Inflate reservoir
through service valve to 80-110 psi.
3.
Route an 8" rubber hose between vacuum and vent
ports,
(fig. 16).
4.
Submerge in water and observe for air leaks at:
Reservoir weld seam.
Reservoir to compressor O-ring.
Regulator to compressor O-ring.
Regulator boot-defective internal.O-rihg.
Diaphragm between first and second stage housings.
' Tightening through bolts may correct the leak.
Cover gasket and retainer screw. A few bubbles here
is not a leak. A continuous stream indicates defec-
tive compressor check valves.
Service valve.
Test gauge connections.
5.
Correct any leaks detected by either tightening
screws or replacing parts.
CHEVROLET CHASSIS SERVICE MANUAL
