Cadillac 60 Series 1963 Shop Manual page 33

4-10
CHASSIS SUSPENSION
to avoid false readings due to the tendency of
tires to take a temporary " s e t " after standing
for a few hours. All runout measurements should
be made on car.
Use Dial Indicator, J-8001, for measuring wheel
runout. Provide a stand similar to the one shown
in Fig. 4-12, for supporting the dial indicator.
This stand was made with Dial Indicator Support,
J-6126, and part of Clutch Piston Actuator Set,
J-4353.
1. Raise wheel being checked.
CAUTION: When checking runout of rear
wheels on cars equipped with a Controlled
Differential, raise both rear wheels off the
ground. Otherwise, the wheel in contact with
the ground will drive when the opposite wheel
is raised and rotated.
2. For checking total lateral runout at sidewall,
position knob of Dial Indicator, J-8001, just above
or below buffing rib on tire sidewall, Fig. 4-12.
Set indicator at zero.
3. Rotate tire and wheel assembly, note and
record amount of runout. Mark tire sidewall
where minimum and maximum runout occurs.
Maximum runout as measured on the tire should
not exceed .050 inch.
4. For checking total radial runout at tread
face, position knob of Dial Indicator, J-8001, in
center of tread face, Fig. 4-13. Position knob
Dial Indicator
Support J-6126
so that it will be least affected by tread pattern.
Set indicator at zero.
5. Rotate tire and wheel assembly, note and
record amount of runout. Mark tire tread where
minimum and maximum runout occurs. Maximum
runout as measured on tire should not exceed
.050 inch.
NOTE: If runout is excessive, but does not
exceed .090 inch it may be possible to reduce
runout to an acceptable level by changing posi-
tion of wheel on studs. Before rotating tire and
wheel, original wheel location should be noted
by marking one wheel stud and corresponding
bolt hole with a daub of paint or chalk.
If runout cannot be reduced to an acceptable
level by rotating tire and wheel around bolt circle,
return tire and wheel assembly to original posi-
tion on bolt circle, and check wheel runout only.
Proceed as follows:
6. Set indicator at zero, and with tire and wheel
assembly raised, check lateral wheel runout at
bead seat by positioning Dial Indicator Extension
on vertical face of rim bead seat (felloe band)
Fig. 4-14. Rotate tire and wheel assembly, note
and record amount of runout. Mark rim where
minimum and maximum runout occurs. Maximum
runout as measured on rim bead seat should not
exceed .045 inch.
Dial Indicator
Support J-6126
Fig. 4-12 Checking Lateral Runout at Sidewall Fig. 4-13 Checking Radial Runout at Tread Face