Pontiac FIREBIRD 1972 Service Manual page 296

4- 10
1972 PONTIAC SERVICE MANUAL
Fig. 4-8 Superlift Shock Absorber
LINES AND FITTINGS
A 1/8" diameter flexible air line is used to allow for rela-
tive motion of shock absorbers with rear suspension move-
ment. Connections to the Superlift leveling units and fill
valve are made with compression fittings. Each fitting
consists of a rubber seal, metal sleeve and nut. These parts
are intended specifically for the 1/8" diameter line and
must be used to affect a reliable seal.
NOTE: While the lines are flexible for easy
routing and handling, care should be taken not
to kink them and to keep them from coming in
contact with the exhaust system.
PRECAUTIONS
a. Maintain a minimum of 10 psi for best ride character-
istics with an empty car.
b. Vary pressure up to a maximum of 90 psi to level the
car with loads.
AUTOMATIC LEVEL CONTROL
B & G SERIES
Automatic Level Control, available as a factory or dealer
installed option on B and G Series, automatically main-
tains the rear standing height of the car at a nearly con-
stant position, regardless of load changes. The system
consists of an air compressor, reservoir tank and pressure
regulator assembly, height control valve, link, two Super-
lift rear shocks and flexible air lines. See Compressor As-
sembly and Pressure Regulator Valve (Fig. 4-9 and 4- 10).
The compressor is a two-stage, vacuum actuated type,
requiring no lubrication. Vacuum supply is taken from the
positive crankcase hose. High pressure air is supplied to
the reservoir tank by the second stage of the two-stage
compressor. The first stage intake stroke draws air at
atmospheric pressure through a oneway check valve
located in the end of the first stage housing under the first
stage housing cover (Fig. 4-1 1). On the first stage com-
pression stroke, the intake valve is closed and the oneway
check valve in the second stage end of the piston is opened.
This allows the air from the first stage cylinder to flow
through the hollow piston into the second stage cylinder
for high pressure compression (Fig. 4-12). The second
stage compression stroke closes the check valve in the
piston and opens the check valve in the end of the second
stage houswng (Fig. 4- 1 1).
To insure satisfactory functioning of the Superlift system,
observe the following precautions:
Fig 4-9 Compressor Assembly