Pontiac FIREBIRD 1972 Service Manual page 290

4-4 1972 PONTIAC SERVICE MANUAL
I
TROUBLE DIAGNOSIS (Continued)
QUICK CHECK OF AUTOMATIC LEVEL CONTROL
SYSTEM
1. Record rear trim height of empty car (measure from
center of rear bumper to ground).
NOTE: Fiff compressor through service valve
with air at available fine pressure.
2. Add weight equivalent to two passenger load (300
lbs.) to rear bumper or tailgate. Car should begin to
level in 4- 18 seconds. Final position should be within
1 " of original measurement.
3. Remove weight. Car should begin to settle in 4-18
seconds. Final position should be within 1" of origi-
nal measurement.
can now be installed on connector opposite the fill
valve. Tighten fitting nut to 70 lb. in. torque.
CAUTION: Make certain a// fittings are air
tight.
COMPRESSOR OUTPUT TEST--ON CAR
1. With all engine operated accessories turned off and
ignition turned off, deflate system through service
valve.
2. Remove high pressure line at regulator and connect
test gage (Fig. 4-1).
3. Inflate reservoir to 70 psi through service valve.
4. Observe test gage for evidence of compressor air leak.
AUTOMATIC LEVEL CONTROL TEST GAGE
To properly service the Automatic Level Control, it will
be necessary to obtain Test Gage J 5907 with adaptor
package J 22695 or equivalent. A test gage can be made
up by collecting and assembling the following parts:
1. Fill valve.
2. A tee, which has three 1/8" female taper pipe
threads.
3. One adapter, which has a 1/4" female taper pipe
thread on one end and a 1/8" male taper pipe thread
on the other end.
4. Air Pressure Gage J 5907.
5. One male connector, which has a 1/8" male taper
pipe thread on one end and a 3/8"-24 male straight
thread on the other end.
6. Two metal sleeves, rubber seals and tube nuts.
)1
7. A length of 1/8" tubing.
ASSEMBLE
1. Install adapter in tee.
2. Install connector in one end of tee.
3. Install fill valve in other end of tee.
4. Install Pressure Gage J 5907 in adapter.
5. Install fitting nut on tubing, then install metal sleeve
and rubber seal over end of tubing until tubing bot-
toms in rubber seal. Tubing, nut and seal assembly
5. If leaking, proceed to leak test the compressor, reser-
voir and regulator as outlined below. If not leaking,
continue with this test.
6. With engine running at slow idle, observe reservoir
build-up for five minutes. Reservoir pressure should
build up to a minimum of 90 psi.
7. If compressor fails to cycle, make sure the vacuum
line and filter is open and unobstructed before remov-
ing compressor for repair.
8. If build-up is too slow, proceed to repair compressor
as outlined in service procedures.
-
I
Fig. 4 - 1 Test Gage Installed on Regulator Valve