Diagnosis Of Front End Alignment; On-Vehicle Service; Inspection - GMC G Service Manual

DIAGNOSIS OF FRONT END ALIGNMENT

PROBLEM
Noisy Front End 1. Worn tie rod ends.
2.
3.
4.
5.
1. Tire and wheel out of balance.
Wheel Bounce
2.
3.
4.
5.
1.
Excessive Tire Wear
2.
3.
4.
5.
6.

INSPECTION

Before making any adjustments affecting caster, camber
or toe-in, the following front end inspection should be made:
Inspect (Figure 2)
1. Tires for proper inflation pressure. Refer to WHEELS
AND TIRES (SEC. 3E).
2. Front wheel bearing for proper adjustment. Refer to
FRONT SUSPENSION (SEC. 3C).
3. Ball joints, tie rod ends, and relay rods. If excessive
looseness is noted, correct before adjusting. Refer to
STEERING LINKAGE (SEC. 3B1).
4. Wheels and tires for run-out. Refer to WHEELS AND
TIRES (SEC. 3E).
POSSIBLE CAUSE
Loose suspension bolts.
Lack of proper lubrication.
Loose shock absorbers or worn bushings.
Loose stabilizer bar.
Blister or bump on the tire.
Improper shock absorber action.
Excessive wheel or tire run-out.
Tire "Lead."
Incorrect wheel alignment.
Failure to rotate tires.
Faulty shock absorbers.
Improper tire pressure.
Overloaded or improperly loaded vehicle.
Broken or sagging springs.

ON-VEHICLE SERVICE

FRONT END ALIGNMENT 3A-3
CORRECTION
1. Replace ends.
2. Refer to FRONT SUSPENSION (SEC. 3C).
3. Refer to MAINTENANCE AND LUBRICA­
TION (SEC. OB).
4. Tighten bolts and/or replace the bushings.
5. Tighten.
1. Refer to WHEELS AND TIRES (SEC. 3E).
2. Replace the tire.
3. Replace the shock absorber.
4. Refer to WHEELS AND TIRES (SEC. 3E).
5. Refer to WHEELS AND TIRES (SEC. 3E).
1. Align the wheels.
2. Refer to WHEELS AND TIRES (SEC. 3E).
3. Replace shock absorber.
4. Refer to WHEELS AND TIRES (SEC. 3E).
5. Avoid overloading vehicle.
6. Replace springs.
5. Dimension "BC" in (figure 2). If not within specifica­
tions, the correction must be made before adjusting
caster.
6. Steering gear for looseness at the frame.
7. Shock absorbers for leaks or any noticeable noise.
Refer to FRONT SUSPENSION (SEC. 3C).
8. Control arms or stabilizer bar attachments for loose­
ness. Refer to FRONT SUSPENSION (SEC. 3C).
9. Alignment equipment. Follow the manufacturer's
instructions.
10. Level of the vehicle. The vehicle must be on a level
surface fore and aft and transversely.
GMTB-0873-2L