Pontiac tempest 1968 Service Manual page 611

10-4
1968 P O N T I A C SERVICE MANUAL
C H E C K
W H E E L LATERAL
R U N O U T HERE '/
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C H E C K
TOTAL
LATERAL !
R U N O U T j
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Fig. 10-3 Lateral Runout Inspection
quire reindexing of tire to wheel. If more than 6
ounces is still required for balance, replace the tire.
4. Wheels and tires must be balanced statically
before being balanced dynamically. Recheck static
balance after dynamic balance.
5. 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 se­
curely to retain the brake drum.
1. Rotate tire on wheel.
2. Make total wheel and tire run -out check.
3. Make wheel run -out check if total lateral wheel
and tire run- out exceeds 1/8" after tire rotation or
total radial run-out exceeds .092".
4. If total wheel and tire assembly run-out minus
wheel run-out is .057" or greater for radial run-out,
or .080" or greater for lateral run-out, excessive
run-out is in the tire. If either occurs, the tire
should be replaced. (Maximum wheel radial run-out
is .035", maximum wheel lateral run-out 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 manufacturer'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. Tires are at normal operating temperatures
(hot).
3. Never use more than 6 ounces of balance
weights. Always split weight evenly between inside
and outside of wheel to avoid changing dynamic
balance. If more than 6 ounces is required, reindex
wheel to drum. Continued out of balance would re-
d. Proceed with balancing operation on the re­
maining 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.
6. When balancing rear wheels on the car, remem­
ber 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.
Wheels are identified as follows:
PONTIAC
Standard . H
Station Wagon „ K
Disc Brake and certain heavy
duty options I
Rally II . . . . . J B
T E M P E S T
Standard . . . B
GTO HG
Disc Brake (Standard) HJ
Disc Brake (GTO). H F
Rally I K B
Rally H (Drum only) JC
Rally I I (Disc only) JA
FIREBIRD
Standard HG
Rally II JC
Disc Brake HK