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WHEELS AND TIRES
Irregular
Tir. Wear
Tires do not wear
equally
in the
different wheel positions on the
car
even when
the front
end adjustments
are within specifications.
The
average
lire wear
varies
in
differcnI wheel
positions and regular
tire
rotation
will
equalize
wear.
This
adds
to tire mile-
age and increased
car
performance.
An unbalanced
condition of
the
front
wheel assembly or
improper
alignment
does nol have to
be
visible
to
the
eye before
its
effects
begin to
damage
'tires or
mechanical paris
of
the
car.
Some types of
mechanical
irregularities
and
unbalance in
wheels
may
be
diagnosed
by examining
tread
wear.
A
single spot or a series of cup-
pings
around
the
circumference of
the
tire may
be
caused
by mechanical
irregularities
such
as underinnation
or
an
unbalanced
wheel.
Excessive
toe-in or
toe-out
of
front
wheels will
cause a small
feather edge
of
rubber
on
the tread
dcsign.
This
condition can be corrected
by toe-in
adjustment of
the
wheels.
Mechanical
irregula rities, such as
worn
or
loose
bearings,
worn bush-
ings,
bent
parts,
loose steering
con-
nections
or
incorrect
camber and
caster adjustments
will
cause exces-
sive and irregular
tire
wcar. Excessive
camber
causes
slippage
between
the
center
and side
sections of the
tire
and
is
the
most
common cause
of
side
wear.
Maltimum tire
life
and
servicc
can
be obtained only when
recommended
air
pressures
are
maintained,
wheel
balance
and
alignment
are
correct,
mechanical parts
of
thc front wheel
and
front
suspension
arc
within
speci-
fications,
brakes
are
properly
ad-
justed,
and
the tires rotated
at
regular
intervals.
To
prolong
tire
life and equalize
wear on
all
tires, rotate the tires
around the car by changing wheel
positions (without demounting tires)
every
12
,000 miles.
Several methods
of tire
rotation
have
been
published,
the method illustrated
in
figure 8,
however,
is preferred.
FIG. 8-
Tire CrOSS-Switching
Djogrom-(6OC-2806)
1-5
TROUBLE SHOOTING
Accurate
diagnosis
of
the
cause of
trouble which
shows
up in the
form
of tire
wear will
probably involve
inspection
of
the
front
suspension
and the
steering
system. For
this
rea-
son,
trouble
shooting
data regarding
wheels
and lires is covered
in the
Trouble
Shooting
Charts in Sections
3
and
5, Fronl Suspension and
Steer-
ing,
respectively.
The
information
in this
Section
dealing
with
Tire
Pressure,
Irregular
Tire
Wear,
and
Wheel Balancing is
also pertinent to the diagnosing and
servicing
of
tire problems.
SPKIFICATIONS
NOTE:
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in incM
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en
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(Sllnda
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(P.S.l.)
Pa_nR",
Car
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Wa80n (No
lOld)
Station
W~ion
(W;lh
Load)
Si..,
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5
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21
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6.00xI
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6,!0~[J
TORQUE VALUES
SPECIAL TOOLS
TOOL NO.
DESCR IPTION
117,
·AE
.
Remover-Gt
.. ..,
Re
tainer
lZI7·A
A R.plo<cr-
FlOn,
Hub
8"'in,.
and
Cruse
!kal
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