Pontiac Fiero 1988 Service Manual page 264

POWER HEAD ASSEMBLY SD2-3
1. BOOT
2. SILENCER
3. VACUUM CHECK
VALVE
4. GROMMET
5. VACUUM SWITCH
(SOME MODELS)
6. GROMMET
7. FRONT HOUSING
SEAL
35. BOOSTER
HM0003-5P2-AB
•
IS
1.
2.
3.
4.
5.
6.
Figure 3 Exterior Components
Primary piston bearing (8) from rear housing (9).
inspect
Front and rear housings:
m Corrosion
• Cracks
• Distortion
m Excessive wear
Use crocus cloth to polish away minor corrosion.
Power piston bearing for:
• Cuts
© Nicks
Replace if damaged.
Clean
Above parts in clean denatured alcohol.
Dry with unlubricated compressed air.
Assemble
Lubricate inside and outside diameters of
primary piston bearing (8) with silicone grease,
P/N 1052863 or equivalent.
Primary piston bearing (8) into rear housing (9).
Power piston group (38) into rear housing (9).
Return spring (11).
Align scribe marks on housings (9 and 10).
Using tool J 23456 (39), apply force in a
clockwise direction to lock front and rear
housings (10 and 9).
Figure 4 Unlocking and Locking Booster
8. P R I M A R Y PISTON
B E A R I N G
R E A R HOUSING
F R O N T HOUSING
R E T U R N SPRING
POWER PISTON
G R O U P
HM0005 5D2 AB
10.
1 1 .
38.
Figure 5 Booster Inner Components
• Stake housing after locking. Stake two tabs
180 degrees apart.
• Do not stake a tab that has been previously
staked.
• Assembly can be aided by connecting a
vacuum source to the booster.
7. Booster as previously described.
POWER PISTON GROUP
Tool Required:
J 28458 Retainer Installer (Power Piston
Seal Protector)