Pontiac Fiero 1988 Service Manual page 267

5D2-6 POWER HEAD ASSEMBLY
16. PRIMARY
D I A P H R A G M
17. P R I M A R Y S U P P O R T
P L A T E
19. HOUSING D I V I D E R
20. SECONDARY
D I A P H R A G M
41. POWER PISTON
ASSEMBLY
H M 0 0 1 0 - 5 D 2 - A B
Figure 10 A s s e m b l i n g Primary Diaphram and Support
15. D I A P H R A G M
R E T A I N E R
32. P U S H R O D
42. T O O L J28458
H M 0 0 1 1 - 5 D 2 - A B
Figure 11 Sealing Diaphragm Retainer
3. Reaction disc (22) and reaction piston (23) from
reaction body (25).
4. Air valve spring (26) and reaction bumper (27)
from end of air valve pushrod (32).
5. Retaining ring (28) from air valve pushrod
assembly (32) using No. 2 Truarc pliers or
equivalent.
6. Air valve pushrod assembly (32) by inserting
screwdriver through pushrod eyelet and pulling
straight out.
• Jonsiderable force will be required.
7. Filter (29), retainer (30) and O-ring (31) from air
valve pushrod assembly (32).
m
m
Inspect
Power piston for cracks.
Rubber parts for cuts or nicks.
Air valve pushrod assembly for corrosion.
Replace part(s) if any of the preceding are found.
Clean
# All parts in clean denatured alcohol.
• Dry with unlubricated compressed air.
22. REACTION DISC
23. REACTION PISTON
24. REACTION BODY
RETAINER
25. REACTION BODY
26. AIR VALVE SPRING
27. REACTION BUMPER
28. RETAINING RING
29. FILTER
30. RETAINER
31. O-RING
32. AIR VALVE
PUSHROD
33. POWER PISTON
H M 0 0 1 2 - 5 P 2 - A B
Figure 12 Power Piston A s s e m b l y
Assemble
1
Lubricated O-ring (31) onto air valve pushrod
assembly (32).
2. Air valve pushrod assembly (32) into power
piston (41).
3. Retainer (30) and seat using appropriate Retainer
Installer (44).
4. Filter (29) over pushrod eyelet into power piston
(41).
5. Retaining ring (28) onto air valve pushrod
assembly (32) using No. 2 Truarc pliers or
equivalent.
6. Reaction bumper (27), air valve spring (26).
7. Reaction piston (23) and reaction disc (22) into
reaction body (25).
8. Reaction body (25).