WHEELS
AND TIRES
10-3
INSPECTION
BEFORE
BALANCING
WHEELS
AND
TIRES
1.
Check
and if necessary adjust front wheel bear-
ings as outlined in section 3.
2. Set tire pressure to cold specifications and
drive
car until tires are hot to eliminate flat (cold
set)
spot
So
3.
Attach a
dial
indicator to the car body or
stationary
support.
With
indicator against tire (Fig.
10-2), slowly rotate wheel and check for total
radial
run-out
of wheel and tire. Maximum allowable total
radial
run-out is .092". If total
radial
run-out ex-
ceeds
.092" then re-index tire to wheel as noted
below and recheck
run-
out of assembly. If
still
over
.092" check
radial
run-out of wheel only.
4. Attach a
dial
indicator to a stationary stand
similar
to
step
3 above. Slowly rotate wheel and
check
for total lateral run-out of wheel and tire.
See Fig. 10-3. Maximum allowable total lateral
run-
out is 1/8". If total lateral run-out
exceeds
1/8"
then attach a
dial
indicator to the stationary object
and
check for lateral run-out of wheel.
Lateral
run-
out of wheel should not exceed .045".
Excessive
total lateral or
radial
run-out of wheel
and
tire assemblies can
sometimes
be reduced within
specifications by rotating the tire on the wheel until
the high
spot
on the tire indexes with the low
spot
on
the wheel. If this procedure fails to bring the total
radial
or lateral run-out within specifications, check
for damaged or improperly mounted tire, bent or
distorted wheel, and variations in tread surface due
to wear and correct as necessary. The following
procedure may be followed to determine if excessive
total lateral or
radial
run-out is caused by wheel
or
tire:
Fig.
10-2
Radial
Runout
Inspection
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