Hudson 1955 Rambler, Technical & Service Manual

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Vacuum Cylinder Assembly
Place new hydraulic rubber seal in recess of
master cylinder.
Position new paper gasket on master cylinder
flange and reinstall the vacuum cylinder shell.
Check scribed alignment marks to insure proper
reassembly.
Place large coiled end of piston return spring
in power cylinder with hook end of spring between
cap screw and raised projection in the bottom of
power cylinder.
Place spring retainer over spring with hook
end of spring in the notch on the retainer.
Compress spring and install new "C" washer in
groove of the master cylinder piston rod.
Assembly of Power Piston
and Valve Assembly
Place a rubber seal on the push rod plunger with
the lip pointing toward the push rod. Coat the
plunger with lubriplate and install it into the
bore of the piston plate; install lock ring (refer
to Fig. 21).
Place stem of vacuum poppet in hole at rounded
end of pivot arm and install two new retaining
clips, one on top of the other. Place pivot arm
and vacuum poppet assembly on end of plunger,
install pivot washer, and engage Spirolox ring
into groove at end of plunger.
Place vacuum poppet arm spring into recess of
piston plate with end of spring contacting the
vacuum poppet stem; install attaching screw.
Place atmosphere poppet spring between pivot
arm and piston plate with large coil of spring
towards atmospheric port. From opposite side of
piston plate, insert atmosphere poppet stem
through plate, spring, and pivot arm and install
two new retaining clips, one over the other.
Power Piston Assembly
Place piston and valve assembly plate assembly on
bench; install Assembly Guide Pins, Tool J-5404,
(Fig. 21). Center reactionary spring on plate
with small coil against plate.
Place diaphragm assembly on top of spring
centering the large coil of the spring in the ring
plate of diaphragm assembly. Place new gasket and
front piston plate on top of diaphragm assembly.
Check scribed alignment marks and make sure
bypass holes are aligned properly.
Compress spring and remove guide pins one at
a time and replace with screws. Check the
centering of the diaphragm assembly before
tightening. Torque screws to 25-40 inch pounds.
Place Piston Assembly Ring, Tool J-5406, on a
bench and install the sleeve and piston plate
assembly into ring with sleeve up (Fig. 22).
Position new leather packing on the piston
with the lip up; place packing plate inside
packing, aligning holes in packing plate to holes
in piston plate.
Cut a new cotton wick to correct length. Dip
it in vacuum cylinder oil and place it inside
the leather packing.
Install expanding packing ring so that
projections will point up and into wick.
Compress lock end of ring and engage notch with
hook near the other end. Place retainer plate
over the assembly ; align holes and cutout in
place.
Install and tighten the five screws suffi-
ciently to prevent any vacuum leakage.
Insert vacuum poppet compensating stem and
compensating diaphragm into recess of piston
plate.
The by-pass slot of diaphragm should face
outward.
Attach steel stop washer to piston hub with
the two retaining screws.
Soften the adhesive side of the rubber stop
washer with gasoline and place it on the steel
stop washer.
Install seal in vacuum port, hook tube
assembly to piston plate, and insert attaching
screw. Attach vacuum hose to tube assembly
(Fig. 20).
Apply a thin film of vacuum cylinder oil to
the inside of the vacuum cylinder.
insert the piston and valve assembly into the
vacuum cylinder. Align the end of the vacuum
hose with the hole at side of the vacuum
cylinder shell for vacuum inlet tube.
When aligned, engage the hooked end of the
piston return spring between the webs on the
back side of the piston. Operate the piston, by
hand, several times and make sure it will
maintain its correct alignment during opera-
tion. If the alignment is not maintained, it
will be necessary to rotate the piston to
relocate.
Install gasket and tube and plate assembly
to cylinder shell.
Install the vacuum hose. Operate piston to
check that the vacuum hose does not contact the
vacuum cylinder shell during the stroke.
Install the end plate and gasket. Crimp the
locking tabs.
Assemble felt valve rod washer on valve rod.
Dip small end of rubber valve rod guard into
brake fluid. Install on valve push rod and
attach to the end plate. Place valve rod guard
retainer in position.
Maintenance
1,000 Miles Check the brake fluid level. Fill to
with-in 1/2" of filler opening.
5,000 Miles Check all vacuum and brake fluid
connections for leakage.
10,000 Miles Check brake pedal linkage; check
linings and drum condition. Clean air
cleaner. Clean check valve on mani
fold.
Pedal Linkage Adjustment
Remove clevis pin and detach push rod assembly
from operating bell crank. Loosen lock nuts and
14 TECHNICAL SERVICE MANUAL