Wheel Bounce; Excessive Tire Wear - Fiat 850 Sedan 1968 Shop Manual

FRONT SUSPENSION AND WHEELS
TROUBLE DIAGNOSIS AND CORRECTIONS
Wheel Bounce.
125
POSSIBLE CAUSES
1) Tire cracked.
2) Uneven tire pressure.
3) Unbalanced wheel rim or tire.
4) Semi-elliptic spring mounting worn.
5) Inoperative shock absorber.
6) Wheel rim or tire misaligned.
Excessive Tire Wear.
POSSIBLE CAUSES
1) Failure to rotate tires.
2) Incorrect camber.
3) Incorrect toe·in.
4) Improper tire inflation.
5) Turning corners too fast.
6) Pick·ups 100 quick.
7) Sustained high-speed driving on gravel roads.
8) Too much play at wheel bearings.
9) Wheel wobble.
10) Stiffened control arms.
11) Brakes out of adjustment.
REMEDIES
1) Repair tire, if possible, or replace it by a new one.
2) Check tire pressure and inflate correctly.
3) Proceed as recommended under
«
Wheels and Tires
»).
4) Replace mounting and rubber pad.
5) Check shock absorber on test equipment and overhaul it.
6) Proceed as recommended under (( Wheels and Tires
II.
REMEDIES
1) For uniform tire wear, interchange tires crosswise every
3,000 miles (5.000 km).
2) Check camber and adjust as recommended on pages 136
and 137.
3) Check toe·in and adjust as recommended on page 168.
4) Proceed as directed under
I(
Wheels and Tires
II.
5) Advise owner to negotiate curves at moderate speed to
reduce tire wear.
6) Advise gradual acceleration.
7) Advise moderate speed on roads of this kind.
8) Adjust clearance and lubricate bearings as outlined on
pages 137, 138 and 139.
9) Locate origin of failure as outlined on next page and pro.
ceed as required.
10) Disassemble control arms and replace damaged resilient
bushings.
11) Set brake shoe·to-drum clearance as directed under
«
Brakes)).