Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
Vehicle Inspection
Inspect the following for damage:
•Inspect the tires.
• Inspect the rims.
Replace any tire or rim that is found to be damaged.
Tire Wear
Inspect the following for accurate tire wear:
• Check the depth of tire remaining tread.
• Standard tire: not less than 1.6 mm.
• Snow tire: 50% tire tread.
If the tread is below the specifications, the tire should be replaced.
Tire Wear Chart
1 Condition: (1) Rapid
Wear At
Shoulders (2) Rapid
Wear At Center (3) Cracked
Treads (4) Wear On
One Side (5)
Feathered Edge (6) Bald
Spots (7) Scalloped
Wear
2 Effect: (1)
Excessive
Tire Wear(2)
Excessive
Tire Wear
(3) Tire
Damage
(4) Vehicle
Pulls(2)
Excessive
Tire Wear(6) Poor
Traction
(7) Excessive
Tire Wear
3 Cause: (8) Under
Inflation Or
Lack Of
Rotation(9) Over
Inflation Or
Lack Of
Rotation(10) Under
Inflation Or
Excessive
Speed
(11)
Excessive
Camber
(12) Incorrect
Toe-in(13)
Unbalanced
Wheel(15) Lack Of
Rotation /
Tires Worn /
Alignment /
Suspension
4 Correction: (16) Adjust
Tire
Pressure To
Specifications
/ Rotate
Tires(16) Adjust
Tire
Pressure To
Specifications
/ Rotate
Tires
(16) Replace
Tire
(17) Adjust
Camber To
Specifications(18) Adjust
Toe-In To
Specifications
(19) Balance
Wheels(20) Rotate
Tires /
Replace Tires
/ Check
Alignment /
Suspension
BESM100022
10–42Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine 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.10
10–50Chery Automobile Co., Ltd.
