Diagnosis Of Wheels And Tires; Checking Wheel And Tire Runout - GMC G Service Manual

DIAGNOSIS OF WHEELS AND TIRES

The following information (including figure 2) will help to
identify certain tire-related durability and driveability
problems.
CHECKING WHEEL AND
TIRE RUNOUT
Some vehicles are sensitive to tire and wheel assembly
runout. Tires that are satisfactory on one vehicle might be
unsatisfactory on another. When analyzing vibration prob­
lems, it is important to keep this in mind. In addition, differ­
ent wheel positions on a vehicle may have different
sensitivity levels. You should check for wheel runout or total
wheel and tire runout in the following cases:
PROBLEM
Excessive Heel and
Toe Wear
Excessive Tire
Edge(s) Wear
Excessive Tire Wear
(Center of TVead)
Uneven Tire Wear
Radial Tire Waddle
(Side to Side
Movement At Speeds
Between 5 and 15
MPH)
Vibration
POSSIBLE CAUSE
High speed driving, excessive use of brakes.
1. Underinflated tires.
2. Vehicle overloaded.
3. High speed cornering.
4. Incorrect toe setting.
Overinflated tires.
1. Improper tire pressure.
2. Incorrect tire and wheel usage.
3. Worn shock absorbers.
4. Front end out of alignment.
5. Loose, worn, or damaged steering linkage,
joints, suspension components, bushings
and/or ball joints.
6. Out of balance wheel/tire.
Worn tires.
1. Out of balance wheel/tire.
2. Tire runout.
3. Wheel runout.
4. Worn tire.
WHEELS AND TIRES 3E-3
— If the tire and wheel vibration occurs below 40 miles
per hour.
— If all wheels are balanced well within one ounce of
static balance and five ounces of dynamic balance,
and a vibration occurs.
— If there appears to be a bulge in a tire or an out-of­
round condition as a tire rotates on a balancer.
— If any wheel damage is noticed.
— If there is a poor wheel fit on the hub and the vehicle
exhibits vibration.
CORRECTION
Correct as required, rotate tires regularly.
1. Inflate to recommended pressure.
2. Correct as required — refer to certification
label.
3. Correct as required.
4. Set to correct specifications.
Deflate to recommended pressure.
1. Inflate to recommended pressure.
3. Install correct tire-wheel combination.
3. Replace shock absorbers.
4. Align the front end.
5. Inspect, repair or replace as required.
6. Balance wheel/tire.
Replace worn tires.
1. Balance wheel/tire.
. 2. Replace tire.
3. Replace wheel.
4. Replace tire.
GMTB-0820-2L