4-18
1968
PONTIAC
SERVICE
MANUAL
Regulator to compress
O-ring.
Regulator
boot—defective
internal
O-ring.
Diaphragm
between
first
and second
stage
hous-
ings--tightening through-bolts may correct the
leak.
Service valve.
Test
gage
connections.
5. Remove
hose
from vacuum 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 sub-
merged, remove cover and tilt unit so that water may
drain
through
openings
by distributor valve mecha-
nism.
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.
2.
Clean
exterior of control valve thoroughly.
3.
Connect
test
gage
and air pressure source to
intake adapter and
open
air pressure
(80-110
psi).
4. Submerge unit in water. No air should
escape
if
overtravel 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.
7.
With
overtravel lever in neutral position, no
air
should escape. If bubbles
escape
from exhaust
port, replace control valve.
8. If air
escapes
around
edge
of cover plate, the
gasket must be replaced.
9. Remove control valve from water. Actuate
overtravel lever to expel any water from unit.
10. Shut off air pressure and remove line from
Superlift
port.
LINES
AND
FITTINGS LEAK TEST
1. Disconnect overtravel lever from
link.
2. Hold lever up in intake position for maximum
Superlift
inflation and release.
3.
Leak
check all connections with a
soap
and
water solution.
SUPERLIFTS LEAK TEST
1. Disconnect lines and remove Superlift from car.
2. Inflate individually to
50-60
psi utilizing
Fill
Valve
from J
22695
package, submerge in water and
observe for leaks.
3.
Install
Superlifts and connect lines.
ON CAR
TRIM
ADJUSTMENT
Trim
adjustment should be performed with a
full
fuel tank (or the equivalent in load at the rate of six
pounds per gallon of gasoline).
1.
Fill
compressor with available air line
pressure.
2. Raise the car on twin
post
or drive-on hoist.
3.
Disconnect the
link
from the upper control arm
bracket.
4. Move the height control valve arm upward until
air
fills the Superlifts.
5. Move the height control valve arm downward
until
air
stops
escaping from the exhaust port on the
height control valve. The Superlifts
will
now hold 8
to 15 psi. Let the arm go to the neutral position.
6.
With
link
attached to the height control valve
arm,
determine which
hole
in the upper control arm
bracket
most
closely aligns with the
link
hole.
7. Loosen valve control arm adjustment nut and
move
metal portion of arm until
link
and bracket
holes
line up and
bolt
link
to bracket.
8. Tighten adjusting nut, being careful not to
move
lever and nylon arm while tightening.
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