Remove Tool - Chevrolet 1973 Overhaul Manual

5 -1 8 BRAKES
36. Wipe a thin film of Delco Silicone Lube #5459912
(or equivalent) on the O.D. of the piston rod
retainer. Insert the master cylinder piston rod
retainer into the cavity in the secondary power
piston so that the fiat end bottoms against the
rubber reaction disc in the bottom of the cavity.
Rear Housing Group
1. Coat the I.D. of the rear housing seal with Delco
Silicone Lube #5459912 (or equivalent).
2. Place the NEW seal in the rear housing center hole
so that the formed flange of the housing center hole
fits into the groove of the seal. The thin lip of the
seal will protrude to the outside of the housing.
Final Assembly
1. Mount Holding Fixture J-22805 in a vise and
position the front housing on the tool so that the
housing studs fit in the holes provided in the tool.
2. Position the power piston return spring over the
inset in the front housing.
3. Assemble the power piston group to the rear
housing by pressing the tube of the primary piston
through the rear housing bearing. Press down until
the housing divider seats in the rear housing and
the primary power piston bottoms against the
housing.
4. Place the piston rod retainer plate on the end of the
power piston return spring in the front housing.
5. Hold the rear housing assembly (with mounting
studs up) over the front housing (make sure that the
piston rod retainer does not dislodge from the
secondary power piston during this operation).
Position the rear housing so that when the tangs on
the edge of the front housing are locked in the slots
on the edge of the front housing, the scribe marks
on the top of the housings will be in line.
6. Lower the rear housing assembly onto the front
housing. Check that the piston rod retainer goes
through the center of the retainer plate on the
power piston return spring. The retainer plate and
power piston spring must seat in the depression in
the face of the secondary power piston. Check that
the bead on the O.D. of the secondary diaphragm is
positioned between the edges of the housings.
7. Assemble front and rear housings as follows:
a.
Straight Mounting Bracket and Chevelle-
Spanner Wrench J-9504 over studs on rear
housing, and attach with nuts and washers-
-draw nuts down tight to eliminate bending or
damaging of studs.
b.
Tilt M ounting
Position Tool J-22893 inside tilted mounting
bracket. Place Spanner Wrench J-9504 on top of
J-22893 and tighten nuts and washers to bolts
provided, securing Spanner Wrench.
c. Press down on spanner wrench and twist rear
Place
Bracket Except Chevelle -
housing clockwise in relation to front housing
until fully locked.
NOTE: If unit is not easily locked, hold
housings together and apply vacuum to check
valve in front housing. Do not put pressure
on power piston extension.
8. Remove Tool J-9504 and, if used, Tool J-22893
from the rear housing.
9. Place the silencer in the closed end of the power
head boot. Stretch the boot over the push rod and
over the flange in the center of the rear housing.
Install the boot retainer over the boot.
10. Remove the power head assembly from Holding
Fixture J-22805 and remove Fixture J-22805 from
the vise.
11. Install the push rod clevis and locknut, if so
equipped.
Gauging
1. Place the power head assembly in a padded vise
(front housing up). Do not clamp tight!
2. Insert the master cylinder piston rod, flat end first,
into the piston rod retainer.
3. Press down on the master cylinder piston rod (with
approximately a 40-50 pound load) to be sure it is
properly seated.
NOTE: Remove the front housing seat to
assure that no vacuum is in the power head
while gauging.
4. Place Gauge J-22647 over the piston rod in a
position which will allow the gauge to be slipped to
the left or right without contacting the studs (fig.
15B).
5. The center section of the gauge has two levels. The
piston rod should always contact the longer section
(lower level) of the gauge. The piston rod should
OVERHAUL MANUAL