Height Control Valve Test-Off Car; Test Gage Installed On Regulator Valve - Pontiac Grand Prix Service Manual

4-18
1 9 6 9 PONTIAC SERVICE MANUAL
Fig. 4-25 Test Gage Installed on Regulator Valve
either been a loss of silicone fluid or valve has lost its
adjustment due to damage or wear. Valve must be
replaced.
COMPRESSOR, RESERVOIR AND REGULATOR
-
LEAK TEST
1. Remove assembly intact.
2. Connect test gage to regulator. Inflate reservoir
through service valve to 80-1 10 psi.
3. Route an 8" piece of rubber hose between vacuum
and vent ports (Fig. 4-26).
4. While holding assembly in a vertical position with
reservoir end down, immerse in water until diaphragm
is just submerged. Observe for air leaks at:
CQ
UTION:
Do not submerge completely, as water can
enter around the cover gasket.
a. Reservoir weld seam.
b. ~eservoir to compressor O-ring.
A
stream of
bubbles may appear in this area and then cease. The
bubbles are caused by atmospheric air being purged
from air pockets in the second stage housing. If the
bubbles stop, there is no leak.
c. Regulator to compressor O-ring.
d. Regulator boot
--
defective internal O-ring.
f. Service valve.
g. Test gage connections.
5. Remove hose from yacuum port and submerge
disconnected end in water. Cover vacuum port with
finger. Do not permit water to enter through vacuum
port. If bubbles are evident, the probable cause is a
defective second stage housing check valve.
6. Correct any leaks by either tightening screws or
replacing parts.
7. If the cover gasket area is inadvertenly submerged,
remove cover and tjlt unit so that water may drain
through openings by distributor valve mechanism.
Move distributor valve from side to side until all water
is purged. Blow dry with compressed air, both the
distributor valve mechanism and interior of the cover.
Replace cover.
If the compressor passes this test, yet fails the output
test, the compressor, reservoir and regulator needs to
be overhauled.
HEIGHT CONTROL VALVE TEST--OFF CAR
1. Remove control valve from car.
4
2. Clean exterior of control valve thoroughly.
3. Connect test gage and air pressure source to intake
adapter and open air pressure (80-1 10 psi).
4. Submerge unit in water. No air should escape if
avertravel lever is in neutral position. If bubbles escape
from Superlift
port,
replace control valve.
5. Shut off air pressure and detach test gage from air
intake port. Plug intake port with fill valve from J
22695 adaptor package.
6. Connect test gage to Superlift port and open air
pressure.
e. Diaphragm between first and second stage housings
Fig. 4-26 Checking compressor, Reservoir and
tightening through-bolts may correct the leak.
Regulator for Leaks