JAC S2 (Chassis). Service Manual

Rear suspension

Rear suspension

9). Install the fixing point connecting the rear brake
discharge pipe assembly and the torsion beam assembly.

2. Install the left rear brake pipe assembly, the right rear brake pipe assembly.

3. Install the left rear caliper assembly
4. Install the right rear brake caliper assembly
5. Install the right rear wheel
6. Install the left rear wheel
7. Fill the brake fluid refers to brake fluid
8. Drain brake System refers to brake system
9. Connect the negative battery cable
10. Close the engine hatch

VI. Rear wheel hub assembly

(I) Special tools

Tool No

Tool name

Outlook

Hub Installation
Tools

(II) Remove

1. Remove the wheels refers to the wheels
2. Drain the brake fluid refers to the brake fluid.
3. Remove the rear brake caliper assembly refers to the rear brake caliper assembly

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Rear suspension

Rear suspension

4. Remove the brake disc assembly refers to the rear brake discs
5. Remove the rear wheel hub assembly

1). Remove a fixing bolt connecting the rear ABS wheel
speed sensor and rear hub assembly.

2). Disengage the connection between the rear ABS wheel
speed sensor and the rear wheel hub assembly.

3) Remove four fixing bolts connecting the rear torsion
beam assembly and hub assembly.

4) Remove the rear wheel hub assembly.

(III) Installation

1. Install the rear wheel hub assembly

1).Successively connects the rear brake disc, rear brake
fender, and the rear wheel hub assembly to the torsion
beam.

2) Install four mounting bolts from inside the torsion beam
assembly connecting the rear hub assembly and the
torsion beam.
Tightening torque 60 ~ 72N • m

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Wheel and Tire

Wheel and Tire

Tire pressure

Tire pressure has a decisive influence on the aspects of tire wear, fuel consumption, fault damage,

therefore, in order to drive safely, maintain standard pressure and check the tire pressure regularly.

The load capacity of the tire is corresponding to inflation pressure; determine a reasonable tire

pressure according to the condition of the vehicle load capacity. Climate and season changes should not
be a reason to adjust the tire pressure.

Incorrect tire pressure can cause:

1) Tires with no enough pressure will cause tire shoulder
quicker wear, tire deflection, rolling resistance increasing

2). Excessive tire pressure causes rapid wear of the
middle part of the tire tread, and reduce tire buffer
capacity.

Tire transposition

When running the wear situation of the front and rear wheels of the vehicle will be very different

according to the different load capacity, so in order to avoid tire wear by a single direction, regular and
timely transposition to make tires wear evenly, thereby extending the life of the tire.

NOTE: tire should be transposed when reach 8000km.

Tires should be transposed if new tires are replaced.

1) The recommended tire transposition

Wheel replacement

1. The wheel should be replaced when reaches 50000km in normal driving.
2. If one of the following occurs, it needs to be replaced:

1).The tire tread has worn at least three markers.

2) Tire rubber cords or cords appear.

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Wheel and Tire

Wheel and Tire

3) The tire tread or tire shoulder crack and cords occur.

4) Tire bump, bulge or delamination.

5) Tire punctured, scratched or otherwise damaged, its
extent is difficult to repair.

Wheel alignment

Correct wheel alignment plays an important role for stable good control of the vehicle, eliminating the
abnormal tire wear, reducing driver fatigue.
Wheel alignment parameters include:

1. Toe

Toe is the difference between the distance of the two front wheels and the distance of the same

wheels two rear ends. If the wheels are perfectly parallel and the toe is zero. If the front wheel inwardly
inclined to car center line, the toe angle is positive. Otherwise the toe is negative.

The function of the toe is compensating the inward or outward rolling tendency caused by camber

angle of the tire and the road surface resistance.

2. Camber

Camber is tire relative angle to the vertical reference line, when the top of a wheel tilts outward,

portion is defined as positive, otherwise defined as negative. Camber settings can affect the control of
the vehicle direction and tire wear.

Improper camber settings can cause excessive tire wear or uneven wear, too much positive

camber will cause the outer tire tread wear, when the load of the outside tread is higher than the inner
side, it will cause uneven wear.

Excessive negative camber will cause the inside of the tire tread wear, the load of the inside tread

is higher than the outside, it will cause uneven wear.

3. Caster

Caster angle is the vertical angle between the kingpin axis and the ground. Kingpin caster angle

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Wheel and Tire

Wheel and Tire

can produce a stability straight line running: The vehicle has a positive kingpin caster angle, while
rotating the wheel to the left, the left wheel will turn left around the kingpin, as the kingpin axis tilt
backward, the wheel ground movement trend downward in the vertical direction, so that it actual lift
up the left vehicle body. When turning is completed, after the release of the steering wheel, and force
the tire rise upwards and return to the relative original height of the body, so that the journal back to
the original position of driving towards the front.

(II) Maintenance parameters

Item

Parameters

Tire pressure (cold)

220±10KPa

Tire size(1.5VVT + 5MT 1.5VVT + CVT)

205/55 R16 94V

Tire size (1.5VVT + 5MT)

205/55 R16 94V

Wheel run out

Radial

steel wheels

1.0mm

Aluminum wheels

0.3mm

Axial

steel wheels

1.0mm

aluminum wheels

0.3mm

Item

Parameters

Wheel alignment parameters

Front
wheel

Front wheel toe

3.75′±6.75′

Front wheel camber

24′±30′

Kingpin Inclination

10.5°±1°

Kingpin caster angle

3.65°±0.75°'

Kingpin offset

Rear
wheel

The total rear wheel toe angle

24′±24′

Unilateral rear wheel toe
angle

12′±12′

Rear wheel camber angle

-56′±30 ＇

(III) Torque parameters

Item

Torque (N • m)

Remarks

1 wheel nut

90~110

2 rod length adjustment lock nut

45~55

3 spare wheel fixing stud

25~35

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Wheel and Tire

Wheel and Tire

(IV) Maintenance Precaution

1. Please use the original wheels.
2. During the new tire run-in period emergency start, sharp turns, sudden braking and using in bad
condition should be avoided to prevent new tires premature failure.
3. The new tire should be carried out wheel balance before using.

II. Fault diagnosis

(I) Fault diagnosis table

No.

Failure
Cause

Failure Analysis

Solution

Remark

steering wheel
circumference
vibration

the tire and rim excessive deflection replace

Wheel nut loose

fasten

Wheel unbalance

replace

Tire unevenly tear

Adjust or replace

Tire insufficient pressure

replace

Front wheel bearing damaged or
worn

Adjust or replace

steering system failure

Adjust or replace 换

suspension system
failure

Adjust or replace 换

tire premature
wear

tire pressure incorrect

Adjust

Wheel alignment bad

Adjust toe and replace

Replace the rear tire torsion
beam

Tire noise tire pressure incorrect

Adjust

tire deteriorate

replace

No.

Failure
Cause

Failure Analysis

Solution

Remark

Road noise or

body
vibration

insufficient tire pressure

Adjust

Unbalanced wheel

Adjust

Deformed rim or tire

Maintain or replace

Tire unevenly wear

Adjust or replace

Steering
wheel motive
up and down

Tire and rim excessive wear

replace

Wheel nut loose

Fasten

Unbalanced wheel

Adjust

engine mounting rubber
cracked or worn

replace

gearbox mounting rubber
cracked or worn

replace

steering wheel
tilt unilateral

Tire pressure on each side
is uneven

Adjust

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Wheel and Tire

Wheel and Tire

Braking system failure

Adjust or replace

Tire pressure incorrect

Adjust

Excessive tire wear or
wear unevenly

Adjust or replace

steering system failure

Adjust or replace

Braking system failure

Adjust or replace

suspension system failure

Adjust or replace

Unstable
running

Tire pressure on each side
is uneven

Adjust

Rim or tire deformation

maintain or replace

wheel nuts loose

Fasten

steering system failure

Adjust or replace

suspension system failure

Adjust or replace

Steering wheel
heavy

insufficient tire pressure

Adjust

steering system failure

Adjust or replace

suspension system failure

Adjust or replace

steering wheel
return bad

insufficient tire pressure

Adjust

steering system failure

Adjust or replace

suspension system failure

Adjust or replace

III Wheel alignment

(I) Wheel alignment check and adjustment

1. Check the wheel alignment parameters

1) Check wheel alignment parameters to see whether it
meets the requirements, if not the front toe should be
adjusted in time, if other parameters not match, find the
cause and replace the parts.

Front toe angle parameters are as follows:

Front toe angle 3.75 '± 6.75'

△ Note the position inspection must carried out on flat

ground under no-load conditions

△ Note the front wheel camber, caster, kingpin inclination

angle and the rear wheel toe-in, rear wheel camber of this
model are pre-programmed at the factory, do not adjust.

△ Note If camber, caster and kingpin inclination is not

within the standard range, check the front suspension,
steering knuckle, shock absorber and tie rod for wear or
damage. If there is the above mentioned condition, replace
suspect parts.

Front wheel camber, kingpin caster angle, kingpin
inclination angle and the rear wheel toe-in, rear wheel

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Wheel and Tire

Wheel and Tire

camber parameters are as follows:

Front wheel camber: 24 '± 30' Kingpin caster angle: 3.65 °
± 0.75 ° Kingpin Inclination: 10.5 ° ± 1 ° total rear wheel
toe angle: 24 '± 24' rear wheel unilateral toe: 12 '± 12' rear
wheel camber angle: -56 '± 30

2. Adjust the front wheel toe

△ Note the position inspection must carried out on flat

ground under no-load conditions

Front toe angle 3.75 '± 6.75'

If the toe is not within the standard range, adjust as
follows:

1) Check the set toe value on the wheel alignment meter.

2). Straighten steering wheel and lock dead.

3) Loosen the tie rod end locking nuts.

4) Turn clockwise or counter clockwise around the tie rod
beam, adjust the toe value to the standard value.

△ Note the turning amount of the tie rod should be

considerable

5) Locking the tie rod end locking nuts.
Tightening torque 45 ~ 55N •m

IV Wheels

(I) Vehicle inspection

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Wheel and Tire

Wheel and Tire

1. Check tire appearance

1). Make sure whether there is wheel wear, inflatable
improper, cracks or other damage.

2. Check the tire pressure.

1) Use a well performed tire gauge to check tire pressure,
if not within the standard value, inflate or deflate the tire.

Standard value: 220 ± 10KPa

3. Check the tire treads

1) Check the depth of the tire treads

Tire size: 205/55 R16 (1.5VVT + 5MT) tire size: 205/55
R16 94V (1.5VVT + 5MT /1.5VVT + CVT)

△ Note when the depth of the tire tread reaches the limit or

less, tire tread has wear indicator. When there is an
indicator, replace the tires.

2) Check the tire treads to see whether there are foreign
objects. If yes, please remove.

(II) Remove

1. Remove the wheel

1) Loosen 5 wheel nuts on the wheel.

2). Lifting.

3) Remove 5 wheel nuts on the wheel.

4) Remove the wheel

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Wheel and Tire

Wheel and Tire

(III) Installation

1. Install the wheel

1). According to the sequent ①-②-③-④-⑤ showed in

the pig to install the wheel nuts, tighten slightly.

2). Lower the vehicle.

3) According to the sequent ①-②-③-④-⑤ showed in the

pig to tighten wheel nuts.

Tightening torque 90 ~ 110N • m

△ Note 1. If manual installation, preload, then evenly

tightening according to the sequence as ① - ② - ③ - ④-

⑤.

2. If the automatic tightening, tightening torque should be
adjusted, tightened once.

3. Strictly tighten all wheel nuts according to fig showed
sequence

V Wheel balance

(I) Remove

1. Remove the wheels needed to be adjusted refers to the tire wheel
2. Remove the old balance weight on both side of the wheels, and remove foreign objects on the tire
treads

△ Note 1. When removing, be careful not to scratch the

wheels.

2. If the tire is new, remove the tape.

(II) Adjustment

1. Adjust the wheel balance

1). Use the center hole as the guide; mount the wheel on
the balancing machine and start the wheel balancing
machine.

2). When the value of internal and external imbalances on
both sides of the wheel have emerged on the balancing
machine monitor, select a balancing pad which weight

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Wheel and Tire

Wheel and Tire

100

close to the equilibrium value and assembly specified in
the balancer wheel on the outside of the corresponding
position.

△ Note Install the outer balance weight before install the

inside ones. Before installing the balance weight, be sure
to clean the wheel surface.

△ Note 1. The balance weight cannot be reused, get a new

one every time.

2. Installed the balance weight pads cannot be more than
three.

3. Always use original pads.

4. Do not place weight pad on another piece.

S2-w3077b

3) Start the wheel balancer again.

4) In accordance with the position (or angle) of the wheel
balancer indication, knock balance pads into the inside of
the wheel.

5) Start balancing machine, confirm the remaining inside
and outside imbalance value is less than 5g, if either side
residual unbalance value is bigger than 5g, please continue
to the above work,

△ Note balance pad should be used according to the

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Wheel and Tire

Wheel and Tire

101

demand, the using standard refers to service technical
parameters form.

VI. Wheel run out

(I) Check wheel run out

1. Remove tire wheel which needed to be checked refers to the wheels.
2. Install the wheel on the wheel balance machine.
3. Set the indicator as shown; inspect vehicle lateral run out and radial run out

Radial run out: 1mm

Lateral run out: 0.3mm

VII Spare tire

(I) Remove

1. Remove the spare tire

1). Open the trunk lid.

2). Uncover spare tire cover.

3) Get the vehicle tool box.

4) Loosen stud fixing the spare tire stud assembly.
5) Remove the spare tire.

(II) Installation

1. Install the spare tire

1) Place the spare tire well.

2). The fixing stud of spare tire stud assembly is screwed
into the rear body floor, the plastic part of the spare tire
stud assembly should fit with the rim center of the hole
edge.
Tightening torque 25 ~ 35N • m

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JAC S2 (Chassis). Service Manual - part 7