Pontiac FIREBIRD 1972 Service Manual page 321

REAR SUSPENSION 4-35
FIRST STAGE HOUSING AND VALVE MECHANISM
1. Inspect housing for cracks or damage and replace 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 replace
if necessary.
5. Inspect distributor valve seat on housing for wear.
Replace housing if necessary.
SECOND STAGE HOUSlNG
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 replace if
necessary.
SECOND STAGE HOUSING
ASSEMBLE
1. Install new check valve and spring.
2. Insert new expansion plug retainer and tap in until it
bottoms (Fig. 4-43).
FIRST STAGE HOUSING AND VALVE
MECHANISM
ASSEMBLE
1. If removed, position bushings in first stage housing
and install rocker arm and swivel arm. Align holes in
rocker and swivel arms and install retaining pin,
small end first.
CAUTION: I f distributor mechanism failed to
operate properly or one or more parts were
found defective, use new parts in Distributor
Valve and Arm Package during remaining reas-
sem bly.
2. Install washer on intake valve and install in first stage
housing with intake valve retaining spring.
3. Install longer foot of valve tension spring in boss on
first stage housing, being careful not to distort spring
(Fig. 4-44).
4. Position distributor valve so that short foot of tension
spring fits under valve and vertical leg is in slot (Fig.
4-45).
5. Install distributor valve bushing, washer, distributor
arm assembly, washer and secure with screw (Fig.
4-46). Tighten screw to 12 lb. in. torque.
6. Install two distributor valve stop bushings and two
arm assembly stop bushings.
NOTE: Do not install actuating arm, arm ten-
sion spring or arm pivot screw at this time as
rocker arm must be free to permit entrance of
piston into first stage housing.
Fig. 4-43 Installing Expansion Plug Retainer Fig. 4-44 Installing Valve Tension Spring in Boss