Pontiac tempest 1968 Service Manual page 610

WHEELS A N D 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 S o
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