Chery Fora (Elara A520). Manual — part 112

CHERY A520 SERVICE MANUAL CHASSIS

35

CHAPTER III FOUR-WHEEL ALIGNMENT CHECK & ADJUSTMENT

SECTION I BASIC CHECK

ADJUSTMENT

WORK

PRIOR

TO

CHECK

I. PREPARATION WORK PRIOR TO
ADJUSTMENT

1.

Check tire pressure and adjust it to
specified pressure

Standard inflation pressure of cold tire (Kpa)

Item

195/55R15 Spare tire

Front wheel

230

Rear wheel

210

250

2. Check the height of vehicle body

First of all, you should inflate the tire
pressure to standard specified value before
measuring the height of vehicle body (the
pressures of the left and right tires should be
consistent with each other.)

① Front measuring point

Measure the height from the ground to the
central point of the bolt connecting the lower
control arm assembly and the front steering
knuckle. The height of the vehicle body at the
left wheel side should be as basically same as
that of the vehicle body at the right wheel
side.

② Rear measuring point

Check the height from the ground to the
central point of the bolt connecting the rear
axle and the vibration damper. The height of
the vehicle body at the left wheel side should
be as basically same as that of the vehicle
body at the right wheel side.

Note: Before checking the wheel alignment,
you should regulate the car to specified
height.

Front

Rear

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If the car height cannot meet the standard,
you should check whether there is damage or
deformation

on

the

front

and

rear

suspensions.

3.

Check the wheel bearing clearance,
and replace front wheel bearings
when necessary.

4.

Check the status of rims and tires.

5.

Check the tightness degree of the
steering linkage and ball joint.

6.

Park the car on the flat ground, and
carry no luggage or person.

7.

Shake wheels to check the tightness of
front suspensions.

8.

Check whether the vibration damper
can operate normally.

1)

Check whether there is oil leakage;

2)

Check whether there is wearing in the
assembly bushings;

3)

Check the damping force of vibration
damper, and replace the vibration
damper if it disqualifies.

Note: The oil tank is semi-filled; the cooling
water in the water tank and the engine oil
reach up to the specified height, and the tire
jack and other tools are in specified positions.

II. RIM AND TIRE

1. Visual inspection

Inspect tire and rim.

During the inspection, if you find any crack,
damage, deformation and other problems on
the rim or tire, you should replace them
instantly. As the right figure illustrated:

Fig. Tire Wearing

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2.

Tire wearing

(1)

Check the depth of left tire tread. As the
right figure illustrated:

Standard tire: not less than 1.6mm.

Snow tire: 50% tire tread.

(2)

I

f the pointed wearing phenomena

occur, the tire should be replaced.

3.

Abnormal tire wearing

Abnormal wearing examples are illustrated in
the right figure.

The possible reasons and resolving methods
are shown in the following table.

Possible Reason

Resolving Method

(a)

* Deficient tire pressure (dual-side wearing)

* High-speed turn

* No tire alignment

* Measure &adjust tire pressure

* Lower down vehicle speed

* Tire alignment

(b)

* Too high tire pressure

* No tire alignment

* Measure &adjust tire pressure

* Tire alignment

(c)

* Improper toe-in

* Regulate toe-in

(d)

* Improper camber angle or caster angle

* Suspension system failure

* Imbalanced tire

* Out-of-round brake drum or butterfly disk

* Other mechanical problems

* No tire alignment

* Regulate, repair or replace axle and
suspension system components

* Repair or replace

* Ensure tire dynamic balance or replace

* Rectify or replace

* Rectify or replace

* Tire alignment

Fig. Tire Wearing

Dual-Side Wearing

Central Wearing

Toe-In or Front

Extension Wearing

Single-side wearing

Fig. Tire Wearing

Wearing Indicating

Wearing Indicating

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4.

Precautions on tire and rim

(1)

Disqualified tire and rim should not be
used.

(2)

Aluminum alloy rim is easily scored,
therefore, soft cloth shall be used to
clean up the rim, and steel brush shall be
prohibited. If vapor is adopted to clean
up the car, the boiling water shall be
separated from the rim.

5.

Tire replacement

(1)

Before assembling tire valve, you
should firstly check whether the valve
port of the wheel is smooth or burry.
And then paste glycerin to the rubber
surface of tire valve or put the tire valve
into the glycerin for a while. Finally,
you shall use special tools to generate
200N-400N air pressure so as to make
the alignment ring pass the aperture of
the wheel. In this way, the tire valve is
installed (soapy water can be allowed to
replace glycerin.).

(2)

Before assembling tire, you should
apply glycerin or soapy water to the rim
edge. At the same time, you should pay
attention to that: when there is dub
marks on rim, you should put the
homogeneity test mark in alignment
with the dub mark. When there is no dub
mark on rim, you should put the
dynamic balance test mark in alignment
with the position of tire valve. When
there is no dub mark and dynamic
balance test mark, but there is static
balance test mark, you should put the
tire valve in alignment with the static
balance test mark.