Chery A15. Manual — part 214

Chapter Four: Use of Wheels, Tires and

Adjustment of Wheel Alignment

It is not difficult to understand the definitions of different angles and their functions,

while it is not that easy to apply these theories on maintenance of four-wheel aligner

and chassis to solve problems occurred. The reason lies in chassis structure, i.e.

aligning angles of four wheels are related to mechanical structure of chassis.

Examples:

1. Changing toe-in angle will also change camber angle: since the wheel will rotate

when changing toe-in angle, the camber angle will also be changed. The bigger the

caster angle is, the bigger the camber angle changes.

2. Regulating caster angle also changes wheel inclination: the upper pivot of steering

shaft will move forward or backward when increasing or decreasing caster angle, and

so will the lowest pivot of steering shaft, i.e. the tire. Therefore, increasing or

decreasing caster angle will move front wheels forward or backward and further

change the axle inclination. To allow the free forward or backward movement of front

wheels, the swivel adopted must be able to move forward or backward, too.

3. Changing camber angle will meanwhile change toe-in angle, while changing toe-in

angle will also change camber angle as well. The adjusting method of camber angle

may differ with different suspension structure. When moving upper or lower revit

leftward or rightward, not only the camber angle but also the toe-in angle will be

changed. Even the camber angle is calibrated, the driving may still be unsmooth due

to the changed toe-in angle. One problem is fixed, but another appears.

4. Changing rear wheel toe-in will affect front monowheel toe-in: rear wheel toe-in

angle decides rear wheel axis of thrust angle. Modern four-wheel alignment adopts

axis of thrust alignment to deside front wheel toe-in.

Note: When adjusting four-wheel alignment, rear wheels shall be adjusted first,

and then front wheels. Adjusting order for rear wheels: camber angle, toe-in

angle, etc.; adjusting order for front wheels: caster angle, camber angle, toe-in

angle, etc.

Section One: Routine Inspection before Alignment

Preparation before Alignment

I. Checking Tire Pressure and Tire/Wheel Rim Models

1. Check tire pressure and regulate to specified values.

Tire inflation pressure

kPa

Item

Front Wheel

Rear Wheel

Spare Wheel

Secondary Spare Wheel

No load/half load

200

220

350

420

Full load

210

260

420

420

2. Wheel Rim and Tire

A15 Tire Model

Tire Model

Wheel Rim Model

185/60 R14×82H

6J×14

Remark:

The above tire-wheel rim specification applies to steel or aluminum alloy wheel rim.

To know application of other tire and wheel rim models, please contact our service

station.

Note: If you plan to install nonstandard tire or wheel rim (such as light alloy

wheel rim or arctic tire), make sure that corresponding specifications are

followed.

3. Interchange of Tires

Wearing of front and rear wheels are not the same due to different working condition.

Wearing of tires is subjected to road surface the vehicle is running on, driving habits

of driver, etc. Generally front wheels are suffering a heavier wearing than rear wheels.

To avoid uneven wearing of tires and achieve a longer service life, interchange tires

every 5000km, meanwhile regulate inflation pressure and check wheel nut tightness.

(1). Using Arctic Tires

Arctic tires must be used by four wheels at the same time. Do not exceed the

maximum speed specified by tire manufacturer when driving with arctic tires, and the

tire pressure specified by manufacturer must be followed.

Note: Arctic tires may have detrimental effects on security and steerability of

vehicle. Arctic tires of the same size and same model shall be used together. Do

not use arctic tires as long as allowed by road condition.

(2). Snow Chain

Check road condition and type before fitting on snow chain, and regulate the chain

accordingly. Snow chain must be fitted in compliance with chain manufacturer's

specification. Snow chain may scratch wheel cowls, so please demount wheel cowl

before using chain. Firmly fit snow chain on front tires. Using snow chain on rear

tires is not recommended. Snow chain shall be refastened after 0.5-1.0km.

Note: Snow chain may have detrimental effects on vehicle control, therefore

vehicle speed shall not exceed 50Km/h (30mph) or the limit specified by chain

manufacturer (if lower than 50Km/h). If the chain is heard to contact with

vehicle body or chassis, stop immediately to fasten the chain. Sharp turns,

impacts, pits, wheel lockup and braking or other items specified by chain

manufacturer shall be avoided when using snow chain. Improper use of snow

chain may cause interference between chain and vehicle body.

4. Installing Tires

(1). Make sure that the wheel valve port is burr-free before fixing valve, then apply

glycerol on rubber surface of valve or dip the valve in glycerol for a while, and put

valve locating ring through the hole in wheel in position by pulling or pressing with a

200-400N force (soapy water is an allowable substitution for glycerol).
(2). Apply glycerol or soapy water on tire bead before installation; meanwhile pay

attention to the followings:

Align the uniformity test mark on tire with the light spot on wheel rim if any.

Align the dynamic balance test mark on tire with valve position in absence of light

spot.

Align the static balance test mark on tire with valve position in absence of light spot

and dynamic balance test mark.

Uniformity, dynamic balance and static balance test marks of tire shall be provided

by product division or the supplier in a written form and indicated on process card.

(3). Tire must be inflated in strict accordance with specified pressure, and the air

pressure during inflation shall not exceed 10% or rated value. Rated inflation pressure

of spare wheel assembly subpackage is 3.5atm. Spare wheel shall be separately stored

with the four wheels in service. Check tire pressure of four wheels and regulate if not

proper: front wheel 2.0±0.2atm, rear wheel 2.1±0.2atm.

(4). After inflation, cover the valve cap and perform dynamic balance test. Attach

weights with appropriate weight to inner and outer edges of wheel rim as required,

and the final assembly unbalancedness shall be less than 100g·cm, which is equivalent

to 5g weights on inner and outer edges of wheel rim.

Note: Only one weight with the maximal mass no larger than 70g is allowed to be