Tire wear diagnostics
New tires should be installed if wear indicators are exposed or if there is heavy wear «shoulder» tires. Wear «shoulder», as a rule, is caused by increased camber or increased toe-in.
In some cases, improperly adjusted rear wheel toe or strut wear will result in severe "bowl-shaped" or "funnel-shaped" wear of non-driven wheels.
Severe misalignment of the rear wheels also results in other unusual wear patterns.
Tire Vibration Diagnosis
The tire vibration diagnostic procedure always starts with a road test. See Section 100-04 for more information. Road test and customer survey (if possible) provide a wealth of information needed to determine the cause of the vibration.
During the road test, the vehicle must be driven on a level road with no roughness. If vibration is evident, note and record the following:
- the speed at which the vibration occurs.
- the type of vibration that occurs in each speed range: mechanical or sonic vibration.
- how does the vibration change: engine torque; vehicle speed; engine speed.
- vibration type - sensitivity: torque sensitive, vehicle speed sensitive, or engine speed sensitive.
The following explanations will help determine the source of the vibration.
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