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3E-2
1977 PONTIAC SERVICE MANUAL
'
TOTAL INDICATOR READING
"
EXCEPT STY LED
IGNORE INDICATOR "JUMPSDUE TO
WHEELS W H K H
WELD SEAMS. PAINT
IUW.
SCRATCHES, ElC.
ARE .035
3902
Fig. 3E-1 Measuring Runout
Fig. 3E-2 Cast Aluminum Wheel
Inflation of Tires
The pressure recommended for any model is carefully
calculated to give a satisfactory ride, stability, steering, tread
wear, tire life and resistance to bruises.
Tire pressure, with tires cold (after car has set for three
hours or more or driven less than one mile), should be
checked monthly or before any extended trip and set to the
specifications on the tire placard located on rear face of
driver's door (except A and G Series); inside glove box door
on A and G Series.
Valve caps or extensions should be on the valve to keep
dust and water out.
1. For continuous high speed operation (over
75
mph)
increase pressure 4 psi up to maximum of 32 psi cold for load
range B tires.
Sustained speeds above
75
mph are not recommended
when the 4 psi adjustment would require pressures greater
than maximum.
2. Tire pressures may increase as much as 6 psi when
hot.
Higher than recommended pressure can cause:
0
Hard ride
0
Tire bruising or carcass damage
0
Rapid tread wear at center of tire
Lower than recommended pressure can cause:
0
Tire squeal on turns
0
Hard steering
0
Rapid and uneven wear on the edges of the tread
0
Tire rim bruises and rupture
0
Tire cord breakage
0
High tire temperatures
0
Reduced handling
0
High fuel consumption
Unequal pressure on same axle can cause:
0
Uneven braking
Steering lead
0
Reduced handling
0
Swerve on acceleration
F
Series cast aluminum wheels are available in four
colors as well as the standard cast aluminum (gray) wheel;
service replacement wheels are available and painting of
wheels in service is not necessary.
MAINTENANCE AND MINOR
ADJUSTMENTS
Wheel Maintenance
Wheel repairs that use welding, heating, or peening are
not approved. An inner tube is not an acceptable repair for
leaky wheels or tires.
Wheel Attaching Studs
If a broken stud is found, see Section 4B (rear) or Section
3C (Front) for Caution and Replacement procedure.
Tire Rotation
To equalize wear, rotate tires according to Fig. 3E-3. D o
not use the
X
method on radial tires as roughness and
irregular wear can result. Radial tires should be rotated at
the first
7500
miles and then at least every
15,000
miles. Bias-
belted tires should be rotated every
7500
miles.
NOTE: Due to their design, radial tires tend to wear
faster in the shoulder area particularly in front position.
This makes regular rotation especially necessary.
Use 4-wheel rotation when car is equipped with
stowaway spare and/or styled (Rally or Cast Aluminum)
wheels.
Cast Aluminum Wheels
Avoid use of strong, caustic cleaners when cleaning cast
aluminum wheels. Clean pocket areas with mild soap and
water. Use aluminum cleaner to highlight machined gloss
surfaces of wheel.
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