Pontiac tempest 1968 Service Manual page 113

4-10
1968 P O N T I A C SERVICE MANUAL
INSTALLATION PARTS
INSTRUCTIONS FOR FASTENING TUBING
1. PREASSEMBLE METAL SLEEVE AND RUBBER SEAL.
2. DROP TUBE NUT ON TUBING.
3. INSERT TUBE INTO METAL SLEEVE AND RUBBER SEAL ASSEMBLY
UNTIL I T BOTTOMS.
4. HOLDING TUBE I N BOTTOMED POSITION, TIGHTEN TUBE NUT
SUPERLIFT METAL SLEEVE AND -
RUBBER SEAL ASSEMBLY
Fig. 4-13 Instructions for Fastening Tubing
2. Remove diaphragm plate, diaphragm, second
diaphragm plate and corprene washer can be
discarded.
3. Remove and discard piston seals and O-rings
from piston.
CA UTION: Be careful not to damage piston.
4. Remove check valve in second stage end of
piston by inserting a suitable punch or piece of 3/32"
welding rod through air passage from first stage end
and tapping.
DISASSEMBLY OF FIRST STAGE HOUSING AND
VALVE MECHANISM
Actuate distributor valve with finger. Valve tension
spring should press against distributor valve, holding
it against either stop. If valve action is not free and
positive, it will be necessary to rebuild using new
parts in Distributor Valve and Arm Package. If
action is free and positive and upon disassembly
there are no damaged parts, parts may be re-used.
1. Remove screw, washer, distributor arm as­
sembly, washer and distributor valve bushing (Fig.
4-18).
2. Remove two arm assembly stop bushing and
two distributor valve stop bushings.
3. Remove distributor valve, being careful not to
distort valve tension spring.
4. Carefully remove valve tension spring from
boss. Do not distort spring.
take check valve and washer, using a pocket knife.
6. If necessary, remove rocker and swivel arms.
Grip pin with pliers and remove pin (Fig. 4-19).
DISASSEMBLY OF SECOND STAGE HOUSING
1. Remove check valve in second stage housing by
inserting a suitable punch or piece of 3/32" welding
rod through air passage and tapping.
CLEANING AND INSPECTION OF PARTS
All metal parts should be cleaned in clean solvent
and blown dry with compressed air.
PISTON AND DIAPHRAGM ASSEMBLY
1. Inspect piston for scoring. Replace if
necessary.
2. Inspect check valve seat. Seat should be smooth
and clean.
3. Inspect diaphragm for holes, looseness or other
defects. Replace if necessary.
FIRST STAGE HOUSING AND VALVE MECHANISM
1. Inspect housing for cracks or damage and re­
place if necessary.
2. Inspect piston bore. Replace housing if scored.
3. Inspect check valve seat. Seat should be smooth
and clean*
4. Inspect distributor valve parts for wear and re­
place if necessary.
5. Inspect distributor valve seat on housing for
wear. Replace housing if necessary.
SECOND STAGE HOUSING
1. Inspect piston bore, replace housing if scored.
2. Inspect check valve seat. Seat should be smooth
and clean.
3. Inspect housing for cracks or damage and re­
place if necessary.
NOTE: Tension spring has one short foot and one
long foot. The short foot fits under the distributor
valve and the long foot fits into a hole drilled at an
angle in the boss (see Figs. 4-21 and 4-22).
5. Remove intake check valve retaining spring, in-
ASSEMBLY OF COMPRESSOR ASSEMBLY
ASSEMBLY OF SECOND STAGE HOUSING
1. Install new check valve and spring.