air condition JEEP CJ 1953 Workshop Manual

'Jeep'
UNIVERSAL
SERIES SERVICE
MANUAL

P h.
Install
the tube seats, flat side toward the check

valve,
and press in with tube nuts or the master

cylinder
brake pipe tube nuts.

BLEEDING
a.
Before the master cylinder is installed on the
car,
the unit must be bled.

b.
Support the cylinder assembly in a vise and

fill
both fluid reservoirs with approved brake fluid,

e.
Loosely install a plug in each
outlet
of the

cylinder.
Depress the push rod several times until

air
bubbles cease to appear in the brake fluid.

d.
Tighten the plugs and attempt to depress the piston. The piston travel should be restricted after
all
air is expelled.
e.
Install
the master cylinder on the car and bleed
the hydraulic lines at the wheel cylinder. Refer to
Par.
P-7.

P-21.
Wheel
Cylinder
Reconditioning
•
Refer to Fig. P-15.
Note:
Make sure a replacement brake cylinder
has the same part number as the original cylinder.

FIG.
P-15—WHEEL
BRAKE CYLINDER
1— Boot

2—
Piston

3—
Cylinder
Cup
4—
Cup
Spring
5—
Cylinder

6—
Bleeder
Screw
a.
To remove a wheel cylinder,
jack
up the vehicle

and
remove the wheel, hub, and
drum.
Disconnect
the brake line at the fitting on the brake backing
plate. Remove the brake
shoe
return spring which

will
allow the brake
shoes
at the toe to
fall
clear of the brake cylinder. Remove two screws holding
the wheel cylinder to the backing plate.
b.
Remove the rubber dust covers on ends of

cylinder.
Remove the pistons and piston cups and
the spring.

c.
Wash the parts in clean alcohol.

d.
Examine the cylinder bore for roughness or
scoring.
Check
fit of pistons to cylinder bore.
e. When reassembling the cylinder, dip springs, pistons and piston cups in brake fluid.
Install

spring
in center of the wheel cylinder.
Install

piston cups with the cupped surface towards the

spring
so that the flat surface
will
be against
the piston.
Install
pistons and dust covers.
f.
Install
wheel cylinder to the backing plate and connect brake line and install brake
shoe
return

spring.

g. Replace wheel, hub, and
drum.

h.
Bleed the brake lines (Par. P-7).

P-22. TROUBLE
SHOOTING

P-23.
Squeaky
Brakes

In
most cases, squeaks are entirely eliminated by

correct
adjustment of the brakes. Squeaks may be
caused however, by glazed linings, lining wore thin
to the point of
exposed
rivets or by vibration. A

drum
will
not vibrate when the brake is securing

uniform
contact over the entire lining surface, ex­
cept when due to improper conditions such as the
linings becoming glazed.
Glazed
surface of the

brake
linings may be removed by a stiff
wire
brush.
Occasionally
squeaks are caused by roughened
sur­

face of the
drum,
which can usually be remedied
by rubbing down with emery cloth and by wiping
the brakings surface clean. In extreme cases it may
be necessary to reface the drum in a lathe. Should
this be done, do not remove a metal thickness greater than .030" [0,762 mm.] - .060" [1,52 mm.]

overall
diameter.

P-24. Rattles
in
Brakes

See that the tension of the springs in the brakes

and
attached to the control system are sufficient to

return
brakes and brake mechanism to their normal
position.
Return
springs are so placed that they
keep all slack out of the control system by tension on all joints.

Brakes
will
not rattle inside the
drum
if the springs
holding the
shoes
are kept at the proper tension. 333

'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL

Q
ice, provide maximum safety over all
types
of

terrain,
and furnish the medium on which the
vehicle can be maneuvered with ease. Although
there are other
elements
of tire service, inflation maintenance is the most important and in many
instances the most neglected. The tire pressure should be maintained for safe operation. An under- inflated tire is dangerous as too much flexing can
cause breakage of the casing. Overinflation in time
may
cause a blowout.

Upon
careful inspection of tires, it may be found
that improper wheel alignment, balance, grabbing
brakes,
poor driving habits, fast cornering or other
conditions are the cause of wear. Such conditions
should be corrected.

a.
UNDERINFLATION

Underinflation
distorts the normal contour of the
tire
body and the tire
bulges
or "bellies out" with

an
extreme flexing action.
This
wears the tread at the
edges
more than the center and generates
excessive internal heat, weakening the cords and
resulting
in bruises, broken cords or ply separation.

Underinflation
also leads to rim bruises as in­ sufficient resistance is provided to prevent the tire

from
being jammed against the rim and crushed
or
cut when the tire strikes a
curb,
rock, or rut.

b.
OVERINFLATION

When
a tire is
overinf
lated,
increased tension caused by excessive pressure prevents proper deflection of
the sidewalls.
This
results in wear in the center of the tread and the tire also
loses
its ability to absorb

road
shocks. Under this increased
strain,
cords in the tread area eventually snap under impact, caus­ing a casing break.

c.
MISALIGNMENT
WEAR
Excessive
wheel camber causes the tires to run at an angle to the road when camber is incorrect

it
will
cause excessive wear on one side of the
tire
tread.

Front
wheels should be straight ahead or toe-in slightly. When there is excessive toe-in or
toe-out,

tires
will
revolve with a side motion and scrape
the tread rubber off.
Front
tires
will
show wear on the outside with too great a toe-in condition
and
on the inside with a
toe-out
condition.

d.
BALANCE
Cupping
and bald spotting of tires is associated

with
wear on a vehicle driven mostly at high-way
speeds
without the recommended tire rotation and

with
unbalance conditions.

Q-12.
Tire
Care
Note;
For satisfactory 4-wheel drive operation, a
4-wheel drive vehicle
MUST
be equipped with the same size tires of equal circumference on all
four wheels. The tires must then be inflated to

proper
factory recommended pressures at all times.

Tire
pressure, tire rotation, wheel balance, and wheel alignment are the four vital factors that in­
fluence the
extent
of tire life and the
ease
and safety of vehicle control.
Four
of the most common

tire
troubles are:

a.
Excessive wear around the outer
edges
resulting

from
underinflation.

b.
Excessive wear in the center of the tread re­
sulting from overinflation.

c.
Tire
tread worn on one side indicating wheels
need realigning.
d.
Cuplike
depressions on one side of the tread

indicating
wheels need balancing.

If
the vehicle normally carries a
full
load, two to
four psi. [0,14 a 0,28 kg-m2] can be added to the
recommended air pressures. But, remember that adding air with a light load means a harsher ride,

doesn't
help tires, and wears out shock absorbers. Rotate the tires as shown in Fig. Q-9 for correct
rotation system.

Q-13.
Tire
Removal
and
Installation

To
remove a tire from a drop center rim, first
WEAR
AT SHOULDERS

WEAR
AT CENTER

WEAR
ON ONE
SIDE
FEATHERED
EDGE
BALD
SPOTS

/1TTDN

i

UNDER
INFLATION
OVER
INFLATION
EXCESSIVE
CAMBER

INCORRECT
TOE
WHEEL
UNBALANCED

liF
11

ADJUST
PRESSURE TO
SPECIFICATIONS
WHEN
TIRES ARE
COOL
ADJUST
CAMBER
TO

SPECIFICATIONS
ADJUST
FOR

TOE-IN
DYNAMIC
OR
STATIC

BALANCE
WHEELS

FIG.
Q-8—TIRE
WEAR
PATTERN
339