Pontiac tempest 1968 Service Manual page 121

4-18
1968 P O N T I A C S E R V I C E MANUAL
Regulator to compress O-ring.
Regulator boot—defective internal O-ring.
Diaphragm between f i r s t 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 L E A K T E S T
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.
S U P E R L I F T S L E A K T E S T
1. Disconnect lines and remove Superlift from car.
2. Inflate individually to 50-60 psi utilizing F i l l
Valve from J 22695 package, submerge in water and
observe for leaks.
3. Install Superlifts and connect lines.
ON CAR TRIM ADJUSTMENT
T r i m 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 w i t h available air l i n e
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.