Cadillac 60 Series 1963 Shop Manual page 35

4-12
CHASSIS SUSPENSION
and especially in cases where non-standard tire
equipment, such as heavier treads and heavier
ply casings, are installed.
h. Static Balance (Stationary Balance)
Static balance is the equal distribution of weight
of the wheel and tire assembly about the axis of
rotation so that the assembly has no tendency to
rotate by itself. Static unbalance causes the
pounding action on the front wheels that is called
tramp. To correct static unbalance when special
equipment is not available, proceed as follows:
1. Remove wheel and hub from steering knuckle
as a unit.
2. Clean all grease from wheel bearings and
races.
3. Clamp a clean steering knuckle in a bench
vise, or if knuckle on car must be used, clean
it carefully.
4. Mount wheel on knuckle and adjust bearings
loosely so that wheel is just held in position and
is virtually frictionless.
5. Make sure that tire is inflated to the correct
pressure.
6. Remove stones or other foreign material
from tread.
i. Dynamic Balance (Running Balance)
Dynamic balance is the equal distribution of
weight of wheel and tire assembly around the
plane of rotation so that the wheel runs smoothly
at all speeds on the axis that runs through center-
line of wheel. Dynamic unbalance causes wheel
wobble at high speeds. Exaggerated cases of
dynamic unbalance cause excessive wear on wheel
bearings and pivot bearings.
A wheel can be in static balance and out of
dynamic balance, but a wheel in dynamic balance
must also be in static balance.
To balance a wheel assembly dynamically, it
should be removed from the car and balanced
on a free moving spindle or wheel balancer stand.
If an on-car type wheel balancer is used, follow
the instructions supplied by the wheel balancer
manufacturer.
CAUTION: On-car type wheel balancers are
not generally recommended for use on the rear
wheels of cars equipped with the optional Con-
trolled Differential, as the wheel in contact with
the ground will drive when the opposite wheel
is raised and rotated. This type balancer may
be used, however, by raising the complete as-
sembly and removing the wheel opposite the
one being balanced.
7. Start wheel in motion and allow it to stop
by itself several times. If it continually stops in
the same position, the assembly is not in static
balance.
8. Mark lowest or heaviest point and also
uppermost, or lightest point.
9. Install a weight at lightest point on inside
rim of wheel to compensate for the out-of-balance
condition.
10. If only a slight unbalance is indicated, use
the following procedure to obtain correct balance.
(a) Install two balancing weights on inside of
rim opposite each other 90° away from the light
and heavy points.
(b) Move these weights equally toward light
side until wheel is in balance.
(c) Install smallest weights available and avoid
adding more weights than are necessary.
11. Repack wheel bearings with grease, install
wheel, and adjust bearings as explained in Note 5.
j. White Sidewall Cleaning
All white sidewall tires on 1963 cars have a
colored protective coating that should be removed
from the tires before delivery of the car. In no
case should the tires be driven more than 50 miles
before this coating is removed.
To remove this coating, wet the tire surface
thoroughly with warm water and allow it to soak
for one minute, then wash, using a stiff brush or
sponge with a stream of water playing on the tire
surface. The coating may also be removed by
steam cleaning.
Unmounted white sidewall tires should be stored
with care. Do not place a tire with a white side-
wall against a tire with a black sidewall because
a chemical reaction may induce bleeding of the
black tire and permanently discolor the white tire.
Ordinary road dirt that collects on white side-
wall tires may be cleaned off with clear water, a
brush and scouring powder. Under no circum-
stances should gasoline, kerosene, or any cleaning
fluid containing a solvent derived from oil be used
to clean white sidewall tires. Mineral oil in any
form is detrimental to rubber, and a cleaner with