Remove Tool - Chevrolet 1973 Overhaul Manual

primary power piston so that the holes at the base
of the tube are covered.
17. Apply Delco Silicone Lube #5459912 (or equiv­
alent) to the O.D. of the primary power piston tube.
18. Remove the primary piston assembly from Tool
J-23101 and lay it aside.
19. Assemble the secondary diaphragm to the second­
ary support plate from the side of the support plate
opposite the locking tangs. Press the raised flange
on the I.D. of the diaphragm through the center
hole of the support plate. Be sure that the edge of
the support plate center hole fits into the groove in
the raised flange of the diaphragm. Apply a thin
coat of Delco Silicone Lube #5459912 (or
equivalent) to the I.D. of the secondary diaphragm
and the raised surface of the flange (that fits into a
groove in the secondary power piston).
20. Mount Tool J-23101 (with large diameter end up) in
a vise. Position the secondary power piston so that
the radial slots in the piston fit over the ears (tangs)
of the tool. Apply a light coat of Delco Silicone
Lube #5459912 (or equivalent) to the tube of the
secondary power piston (fig. 4B).
21. Fold the secondary diaphragm away from the O.D.
of the secondary plate.
22. Holding the edges of the support plate with the
locking tangs down, place the secondary diaphragm
and support plate assembly over the tube of the
secondary power piston. The flange on the I.D. of
the secondary diaphragm will fit into the groove in
the secondary piston.
23. Grip the edges of the secondary support plate, press
down, and rotate counterclockwise until the tabs on
the secondary power piston contact the stops on the
support plate. Fold the secondary diaphragm back
into position on the secondary support plate. Leave
the secondary power piston assembly on Tool
J-23101 in the vise (fig. 6B).
24. Apply a light coat of talcum powder or Delco
Silicone Lube #5459912 (or equivalent) to the bead
on the O.D. of the secondary diaphragm. This will
facilitate reassembly of front and rear housings.
25. Place the secondary diaphragm support ring on the
secondary power piston assembly so that it rests on
the edge of the diaphragm.
26. Hold the housing divider so that the formed over
flange (that holds the primary diaphragm) of the
divider faces down. Place the secondary bearing in
the I.D. of the divider so that the extended lip of
the bearing faces up.
27. Lubricate the I.D. of the secondary bearing with
Delco Silicone Lube #5459912 (or equivalent).
28. Position secondary Bearing Protector Tool J-23188
on the threaded end of the secondary power piston
(fig. 14B).
29. Hold the housing divider so that the six oblong
protrusions on the middle of the divider are facing
up. Press the divider down over the tool and onto
the secondary power piston tube where it will rest
against the diaphragm support ring. Remove Tool
J-23188 from secondary power piston; however, do
not remove the secondary power piston sub-
assembly from Tool J-23101.
30. Pick up the primary power piston assembly and
fold the primary diaphragm away from the O.D. of
the primary support plate.
31. Position the small end of the air valve return spring
on the air valve so that it contacts the air valve
retaining ring.
32. Position the primary power piston on the tubular
portion of the secondary power piston, making sure
that the air valve return spring seats down over the
raised center section of the secondary piston.
33. Grip the edge of the primary support plate, press
down, and start the threads on the secondary power
piston into the threaded portion of the primary
power piston by rotating in clockwise direction (fig.
5B).
34. Continue to tighten the primary power piston until
it is securely attached (approximately 5-15 ft. lbs.)
to the secondary power piston.
35. Fold the primary diaphragm back into position on
the primary support plate and pull the diaphragm
O.D. over the formed flange of the housing divider.
Check that the bead on the diaphragm is seated
evenly around the complete circumference.
FORMED FLANGE
Fig. 14B--Positioning Housing D ivider Over Secondary
Bearing Protector Tool J-23188
BRAKES 5-17
J-23188
OVERHAUL MANUAL