Chery QQ - Page 269

Chery QQ Service Manual Chassis System
2、Tire tears and wears
（1）Check the depth of the remaining tire
textures.
The depth of the remaining tire textures (as shown
in the Figure)
Standard tires: 1.6mm min.
Snow ground tires: 50 % tire textures
（2）In the case that the wear-and-tear indication
belt is exposed, the tire must be replaced.
Indication points for tire tears and wears
3、Abnormal tears and wears of tires
The abnormal tears and wears of the tires as
shown in the right figure might occur. Refer to the
following table for the possible causes and the
approaches for handling the trouble.
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Toe-in and toe-out wear Unilateral-wear
Tears and wears of tire
Possible causes Approaches for handling
（a）
* Insufficient tire air pressure
(tears and wears on both sides)
* Turning in fast speed
* Tire positions not re-adjusted
* Test and adjust tire air pressure
* Slow down car speed
* Re-adjust tire positions
（b）
* Excessively high tire air pressure
* Tire positions not re-adjusted
* Test and adjust tire air pressure
* Re-adjust tire positions
（c） * Toe-in incorrect * Adjust the toe-in
（d）
* Camber angle incorrect
* Suspension system defective
* Tires not balanced
* Brake drum or disk not circular
* Other mechanic troubles
* Tire positions not re-adjusted
* Adjust, repair or replace the parts
of the axle and suspension system
* Repair or replace the suspension
system
* Make dynamic balance of tires or
replace the tire
* Make alignment or replacements
* Make alignment or replacements
* Readjust the tire positions
Center wear
bi-wear
Wear position
Wear position
Chery Automobile Co., Ltd