Pontiac FIREBIRD 1972 Service Manual page 320

4-34 1972 PONTIAC SERVICE MANUAL
Fig. 4-40 Removing Diaphragm Retainer
FIRST STAGE HOUSING AND VALVE
MECHANISM
DISASSEMBLE
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 assembly,
washer and distributor valve bushing (Fig. 4-41).
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.
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.
4-43
and
4-44).
5. Remove intake check valve retaining spring, intake
check valve and washer, using a pocket knife.
6. If necessary, remove rocker and swivel arms. Grip
pin with pliers and remove pin (Fig. 4-42).
SECOND STAGE HOUSING
DISASSEMBLE
Remove check valve in second stage housing by inserting
a suitable punch or piece of 3/32" welding rod through air
passage and tapping.
CLEAN A N D INSPECT 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 de-
fects. Replace if necessary.
Fig. 4-41 Distributor Valve Assembly
Fig.
4-42
Removing Rocker Arm Pin