DIAGNOSIS & TESTING
Vehicle Inspection
Visual inspection of the vehicle is recommended prior to road testing or performing any other procedure. Raise the
vehicle on a suitable hoist.
Inspect the following:
• Inspect tires and wheels for damage, mud packing and unusual wear; correct as necessary.
• Check and adjust tire pressure to the pressure listed on the label attached to the driver’s door opening.
Tire and Wheel Vibration
Tire and wheel imbalance, runout and force variation can cause vehicles to exhibit steering wheel vibration.
NOTE :
Balance equipment must be calibrated and maintained per equipment manufacturer’s specifications.
Tire Wear Patterns
Tire wear patterns can be traced to the following tire conditions:
• Under inflation will cause wear on the shoulders of tire.
• Over inflation will cause wear at the center of tire.
• Excessive camber causes the tire to run at an angle to the road. One side of tread is then worn more than the
other.
• Excessive toe-in or toe-out causes wear on the tread edges and a feathered effect across the tread.
NOTE :
Tread wear indicators are molded into the bottom of the tread grooves. When tread depth is 1.6 mm, the tread wear
indicators will appear as a band. Tire replacement is necessary when indicators appear in two or more grooves, or
if localized balding occurs.
Wheel Out-Of-Round Inspection
• Raise vehicle and securely support it.
• Attach a dial indicator on the edge of the rim and measure its unevenness.
• Replace the rim if necessary.
NOTE :
On both edges of the rim, the maximum allowed average value of the unevenness should not exceed the following:
MAXIMUM RIM OUT-OF-ROUND
Steel Rim 5 mm
Aluminum Rim 3 mm
10
10–47
Chery Automobile Co., Ltd.
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