Chery S11 / Chery QQ. Manual - part 194

  Chery    QQ    Maintenance Manual                                        Chassis System

 

 

Chapter two    Tests and Adjustments of 

Four-Wheel Positioning 

 

Section One: Basic Tests and Checks 

 

Preparations prior to adjustments 

I. Checks prior to adjustments   
（1）Checks on tire air pressure                       
（2）Checks on car body             
1、Check the tire air pressure,   
and adjust to the specified pressure. 

 

Standard air pressure for tires (kPa) 
 

Item 

Front wheel 

Rear wheel 

Spare tire 

Zero load 

220 

220 

250 

 
2、Check the spacing of front wheel bearings, and replace the front wheel bearings when 
necessary; 
3、Check the status of the wheel outer rims, as well as the status of the wheel sections and 
tires; 
4、Check to see if the ball joint of the horizontal draw-bar for turning is too loose; 
5、Place the car on a leveled ground without any luggage or passenger; 
6、Make sure that the left and right heights from the wheel center line to the dasher do not 
exceed the standard heights; 
7、Check to see if the absorber performance is normal. 
 
 
II. Rim section and tire 
1、Visual checks 
Check the tires and rim sections, and make proper 
replacements if any cracks, damages, deformations 
or other defects are detected on the rim sections or 
tires. 
 

                                                       

Tears and wears of tire   

 

 

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  Chery    QQ    Maintenance 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.                                           

Wear position

Wear position

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. 

bi-wear

Center wear

     
 
 

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 

 
4、Points of attention for the rim sections and tires 

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  Chery    QQ    Maintenance Manual                                        Chassis System

 

（1）Do not use the under-standard rim sections or tires; 
（2）The aluminum alloy rims are easy to be damaged by scraps. Please use soft cloth 
when doing the cleaning. Never try to use steel brushes. If steam is used for cleaning the 
car, do not allow the boiling water to contact the rim sections; 
（3）In the case that some alkali chemical compounds (such as mud water, road surface 
mud, etc.) stain on the aluminum alloy rim sections, use the neutralizing agents to clean 
them off as soon as possible so as to avoid the rim sections from being damaged. 

 

5、Tire replacements 
（1）Before installing the air valve nozzle, first check to see if the air valve opening on the 
tire is smooth and free of rags. Then apply some glycerin onto the surface of the air valve 
nozzle rubber or dip the air valve nozzle in the glycerin. Use the special tools to exert the 
air pressure of 200—400N so as to allow the positioning ring of the air valve nozzle to pass 
the hole on the wheel which complete the installation and positioning (soap solution can be 
used to substitute glycerin); 
（2）Before installing the tires, apply glycerin or soap solution along the tire rings. Make 
sure that when there are light indication spot marks on the rims, the test marks for tire 
balance should be aligned with these light indication spot marks. When there are not light 
indication spot marks on the rim, the dynamic balance test marks of the tire should be 
aligned with the air valve nozzle position. If there are neither light indication spot marks 
on the rim nor dynamic balance test marks on the tire, but there are static balance test 
marks on the tire, make sure that the air valve nozzle is aligned with the static balance test 
marks. 

     

6、Tire pressure 
Check the air pressures of all the tires (including the 
spare tire) with the barometer. Make proper adjustments   
if the air pressure does not meet the specifications. Strictly   
follow the specified air pressure in filling the tires with air.   
During the air filling, the air pressure should not exceed the   
nominal air pressure by 10 %. The tire with filled air should   
be placed separate from the wheel mounted on the car. Before 
doing the positioning of the four wheels, please check the air   
pressures of the four wheels and make proper adjustments   

tyre

air hole 

so as to meet the specified air pressure. 
 
 
   
7、Air leakage 
Make sure there is no air leakage at the air valve.   
Checks of air valve nozzles 
 
8、Rim sections and tires non-circularity 
（1）Lift the car and support it securely; 

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  Chery    QQ    Maintenance Manual                                        Chassis System

 

（2）Place the probe of the dial gauge on the rim section and measure the extent of 
non-circularity for each turning of a circle. 
Limit for non-circularity: Unit mm 

 

 

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Inspection on the tire non-circularity 

 

Longitudinal 1.5(0.06) 
Sideways 

2.5(0.10) steel rim section 
2.0(0.08) aluminum rim section

（3）Replace the tire if necessary                    

 
 

9、Readjustments of tire positions 

In order to extend the operational life of tires and to 

determine the tears and wears of the tires, readjustments   
of tire positions should be carried out for every 6,000km 
(3,750 miles) of driving. 

 

As shown in the Figure: 

                                                                                        Readjustment of tire positions 

Attention:                                                                     
* Best-quality tires must be used for the front wheels; 
* After readjustments of tire positions, make sure that the air pressures for the tires are 
adjusted to the specified air pressure values. 
 
 
10、Adjustment of tire balance 

After the tires are filled with air, fix the protective   

capsfor the air valve nozzles tightly and then make the   
testson dynamic balance. Place the balance blocks with   
appropriate weights on the inner and outer edges of the   
rims as required. According to the specifications, the   
imbalance of the final assembly should be no larger than   
100g/cm, which is approximately equal to the 5g balance 
blocks on the inner and outer edges of the rims. It should 
be noted that at most one balancing block is allowed to be 
placed on each side of each wheel, with the maximum mass no larger than 70g. During the 
process of assembling, excessively heavy shocks should be avoided to the balancing 
blocks. In the case that excessive shocks are felt, the balancing blocks should be replaced 
in time. The balance blocks taken down in the replacement should not be used again.