Balance Procedure; Piontiac Wheel Codes; Tempest Wheel Codes; Grand Prlx Wheel Codes - Pontiac Grand Prix Service Manual

10-4 1969
PONTLAC SERVICE MANUAL
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 runout of wheel
and tire. Maximum allowable total radial runout is
.092". If total radial runout exceeds .092", then
re-index tire to wheel as noted below and recheck
runout of assembly. If still over .092", check radial
runout 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 runout of wheel and tire. See Fig. 10-3.
Maximum allowable total lateral runout is 1/8". If
total lateral runout exceeds 1/8", then attach
a
dial
indicator to the stationary.object and check for lateral
runout of wheel. Lateral runout of wheel should not
exceed .045".
Excessive total lateral or radial runout 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 runout 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
runout is caused by wheel or tire:
1. Rotate tire on wheel.
2. Make total wheel and tire runout check.
3. Make wheel runout check if total lateral wheel and
tire runout exceeds 1/8" after tire rotation or total
radial runout exceeds .092".
4. If total wheel and tire assembly runout minus wheel
runout is .057" or greater for radial runout, or . O 8O" or
greater for lateral runout, excessive runout is in the
tire. If either occurs, the tire should be replaced.
(Maximum wheel radial runout is .035", maximum
wheel lateral runout is .045".)
BALANCE PROCEDURE
The preferred method of balancing wheels and tires is
with on-the-car type equipment. But whether on or off
car-type equipment is used, always follow the manufac-
turer's instructions for the equipment being used. In
addition, pay particular attention to the following
points.
1. Be sure tires are free of stones or other foreign
objects that may become wedged in the tread. Be sure
wheels are free of mud and brake drums do not drag
on brake shoes.
2. Ties are at normal operating temperatures (hot).
NOTE: Always split weight evenly between inside and
outside of wheel to avoid changing dynamic balance.
3. Wheels and tires must be balanced statically before
being balanced dynamically. Recheck static balance
after dynamic balance.
4. When balancing rear wheels on the
car,
always
check to see if car is equipped with Safe-T-Track
differential. Never balance Safe-T-Track-equipped
car with one wheel on ground as car may move
when engine is started and transmission is in drive
gear.
If car is equipped with Safe-T-Track rear axle, the
balancing of the rear wheels should be performed as
follows:
a.
Raise
and block the rear of the vehicle with both
wheels off the floor.
b. Remove one wheel.
c. Reinstall two (2) lug nuts and tighten securely t o
retain the brake drum.
d. Proceed with balancing operation on the remaining
wheel using engine power to spin the wheel.
e. When proper balance has been achieved on
first
wheel, reinstall the second wheel and balance in the
same manner.
5. When balancing rear wheels on the car, remember
that: with one wheel on the ground, speedometer
speed is one-half (1/2) rear wheel speed. With both
wheels off the ground, speedometer speed is the same
as rear wheel speed.
PIONTIAC WHEEL CODES
Standard.
.....................................
KF
Station Wagons..
................................
.I
.......................................
Rally 11.. JJ
TEMPEST WHEEL CODES
Standard (Six Cylinder).
.........................
HJ
Standard (All V-8).
.............................
HF
Rally 11..
......................................
JA
Space Saver.
...................................
KC
GRAND PRlX WHEEL CODES
Standard (7' Wide).
..............................
IF
Rally I1 (7' Wide).
..............................
JK
Standard (6' Wide).
.............................
HF
Rally I1 (6' Wide).
..............................
JA
.................................
Space Saver.. .KC