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Chery S11 / Chery QQ. Manual - part 38

Chery QQ Service Manual Chassis System

III. Check and adjust the front wheel main pin backward tilting angle,

main pin interior falling-in angle, wheel camber angle as well as the wheel

toe-in and steering angle

Specifications: The requirements for the front wheel positioning are as follows:

Main pin backward tilting angle

3°.15

±30

Front wheel camber angle

[465]:1°±30

Single front wheel toe-in angle

±10

Steering angle

Inner side：35

±4° Outer side：

±4

Note: The backward tilting angle is adjusted before adjusting the camber angle and the
toe-in angle.

1、Main pin backward tilting angle
This angle is assured by way of the designed configuration, which makes the operational
adjustments unnecessary.

The impacts of backward tilting angle

The major function of the backward tilting angle is to keep the car moving in the

straightly forward direction. If the backward tilting angle is positive, the inner side of the
car will be lowered when the front wheel turns in directions, which results in the uprising
of the chassis. That will increase the loads onto the knuckles. If the backward tiling angles
of the two wheels are identical, the car will be back to the straightforward direction after
turning the directions. The increase of the positive backward tilting angle will increase the
stability of the steering wheel, but the turning forces will be increased as well. The decrease
of the positive backward tilting angle will reduce the stability of the steering wheel but the
turning forces will become reduced. The extent of the backward tiling angles will not have
impacts upon the tears and wears of the tires. They are used to stabilize the driving
directions and ensure the automatic returning to the straightforward direction after turning.
If the car is equipped with the traditional mechanic steering devices, the backward tilting
angle will be very small or even tending to be in the negative, which makes the turning of
direction easier. If the car is equipped with the dynamic steering device, the backward tiling
angle is generally set to be relatively large positive angle, which allows the driver to feel
the turning of directions. The increase of the positive backward tiling angle will increase
the forces for turning, and increase the stability in straightforward movement of the car.

2、Camber angle
Under normal circumstances, the camber angle does not have to be adjusted after the car
is equipped with the independent suspension system and wheel knuckles. In the case that
the wheel camber angle is detected to have bias from the allowances due to some reasons,

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Chery QQ Service Manual Chassis System

alignment can be made by way of adjusting the connecting screw nuts for the
independent
suspension system and the knuckles.

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(1) (2)

(1)   First check (visually) to see if there are any
damages on the driving system parts and components
before doing the alignment. Replace the damaged parts
or components if there are any. The camber angle
designed and set for the front wheels by the manufacturer

Adjustment

screw nut

cannot be adjusted;

(2)  In the case that the front wheel camber angle is detected to exceed the allowed bias,
loosen the connecting screw nuts for the front absorber and the knuckles, and move the
wheel for proper alignments.

3、Toe-in
Special four-wheel positioning testers should be used to test and adjust the toe-in.

(1)  Make preparations prior to the adjustments as required by the tester. Use the steering
wheel limiter to fix the steering wheel in the straightforward direction (the steering wheel
must be in the center position±5 degrees, and the lower clamping flange of the steering
axle should keep horizontally leveled).
(2) Loosen the locking screw nuts (1) of the
steering horizontal drawbar.

(3) Remove the elastic protective clip ring (2)
with a pair of pliers.

Attention: Replace the clipping ring if it is not elastic enough.
(4) Turn the toe-in adjustment rod to adjust the length as
  needed till it meets the specified value.
(5) Tighten the screw nut (1) and re-install the protective elastic clip ring (2), check to
see if the locking screw nut is tight enough and if the position of the protective sheath is
correct or not.
(6) Upon completion of the adjustments for the front wheel toe-in, check to see if the
steering wheel is leveled. If not, loosen the locking screw nut of the steering wheel and
adjust the steering wheel to the leveled position. Tighten the locking screw nut till it
meets the torque specification (27-33Nm).

4、Check and test the front wheel steering angle
After the horizontal drawbar joint is replaced or the toe-in is adjusted, the steering angle
should be checked. If it fails to meet the specifications, the length of the left and right
horizontal drawbars should be checked and adjusted.

Chery QQ Service Manual Chassis System

IV. The toe-in and camber angle of the rear wheels cannot be adjusted.

Check the camber angle and toe-in of the rear wheels. If they fail to be in the specified
limits, check to see if there are any deformed parts. Replace the defective parts.

Section Four: Guide to Trouble-Shooting

Problem Possible

cause

Countermeasures

Excessive tear-and-wear

or unevenly distributed

tears and wears of tires

As indicated later

Tears and wears of tires

ahead of scheduled

operational life

Incorrect tire pressure

Incorrect wheel positioning

parameters

Adjustment

Tire noises

Incorrect tire air pressure

Tears and wears of tire

Adjustment

Check, adjustment,

replacement

Road surface noises or

vibration of car body

Insufficient tire pressure

Imbalance of tires

Deformed rim section or tire

Unevenly distributed tears

and wears of tire

Adjustment

Repair or replacement

Check, adjustment,

replacement

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Chery QQ Service Manual Chassis System

Vibration up
and down of
steering wheel

Excessive bias of tire and rim section
Loose wheel screw nuts or axle heads
Imbalance of tires
Broken or damaged engine suspension
rubber
Broken or damaged gear box supporting
stand rubber

Replacement
Tightening
Adjustment
Replacement

Replacement

Circling
vibration of
steering wheel

Excessive bias of tire and rim section
Loose wheel screw nuts or axle heads
Imbalance of tires
Unevenly distributed tears and wears of tire
Insufficient tire air pressure
Broken or damaged front wheel bearings
Faulty steering system
Faulty suspension system

Replacement
Tightening
Adjustment
Check
Adjustment
Replacement
Check
Check

Lopsidedness
of steering
wheel

Abnormal tire air pressure
Excessive tears and wears of tires or
unevenly distributed tears and wears
Faulty steering system
Faulty braking system
Faulty suspension system

Adjustment
Check

Check
Check
Check

Unstable
movement

Inconsistent air pressures for the tires on both
sides
Deformed rim section or tire
Loose wheel screw nuts
Faulty steering system
Faulty suspension system

Adjustment

Repair or replacement
Tightening
Check
Check

Lopsided
braking

Unbalanced tire air pressures on both sides
Faulty braking system

Adjustment
Check

Heavy steering
wheel

Insufficient tire air pressure
Faulty steering system
Faulty suspension system
Incorrect wheel positioning parameters

Adjustment
Check
Check
Check

Poor operation
of steering
wheel to return
to straight for-
ward direction

Insufficient tire air pressure
Faulty steering system
Faulty suspension system
Incorrect front wheel main pin backward
tilting

Adjustment
Check
Check
Adjustment

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Content .. 36 37 38 39 ..