Pontiac tempest 1968 Service Manual page 119

4-16 1968 P O N T I A C SERVICE M A N U A L
. 0 2 0 " S H I M S T O C K
Fig. 4-25 Installing Piston Seal
5. Install fitting nut on tubing, then install metal
sleeve and rubber seal over end of tubing until tubing
bottoms In rubber seal. Tubing, nut and seal assem­
bly can now be installed on connector opposite the
f i l l valve. Tighten fitting nut to 70 l b . In.
NOTE: Make certain all fittings are air tight.
COMPRESSOR OUTPUT TEST-ON CAR
1. With a l l engine operated accessories turned off
and ignition turned off, deflate system through serv­
ice valve. Remove high pressure line at regulator
and connect test gage (Fig. 4-26).
1. Deflate system through service valve and dis­
connect line at pressure regulator valve. Install test
gage on regulator valve high pressure fitting (Fig.
4-27).
2. Inflate system through service valve to maxi­
mum available pressure (Fig. 4-26).
NOTE; If available pressure is less than 140 psi,
start engine to build-up reservoir to this pressure.
3. Regulated pressure should build-up to and hold
steady at 100-130 psi on test gage.
4. Check regulated pressure by momentarily (not
more than one second) depressing valve core on test
gage and observer gage reading.
5. i f regulated pressure now reads less than 100
psi, replace regulator assembly.
6. I f regulated pressure exceeds 130 psi, replace
regulator assembly.
HEIGHT CONTROL VALVE TEST-ON CAR
EXHAUST (SUPERLIFTS INFLATED)
1, Disconnect overtravel lever from link.
2. Hold lever down in exhaust position until Super-
lifts deflate or for a minimum of 15 seconds.
2. Inflate reservoir to 70 psi through service
valve.
3. Observe test gage for evidence of compressor
a i r leak.
4. I f leaking, proceed to leak test the compressor,
reservoir and regulator as outlined below. I f not
leaking, continue with this test.
5. With engine running at slow Idle, observe reser­
voir build-up for five minutes. Reservoir pressure
should build up to a minimum of 90 p s i .
6. I f compressor fails to cycle, make sure the
vacuum line and filter i s open and unobstructed
before removing compressor for repair.
7. i f build-up i s too slow, proceed to repair com­
pressor as outlined in Service Procedures.
8. Satisfactory build-up indicates system problem
to be i n the control section. However, again observe
the test gage for evidence of an air leak and proceed
accordingly.
PRESSURE REGULATOR TEST
Performance test the regulator with a known good
compressor on the car.
3. I f Superlifts deflate, perform Intake Check.
4. I f Superlifts do not deflate, remove exhaust
adapter from control valve and hold lever down as
in Step 2. Replace adapter, O-ring and filter i f
this deflates Superlifts.
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Fig. 4-26 F i l l i n g System through Service V a l v e