Renault Scenic 3 Chassis. Manual - part 18

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1

WHEELS AND TYRES

Tyres: Identification

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Example of a tyre identification marking: 205/55 R 16
91 V.

Speed index table:

101008

205

Tyre width in mm (l)

55

Height/width ratio (h/l)

R

Radial structure

16

Internal diameter in inches

91

Load index

V

Speed code

Code

Maximum
s p e e d   i n
mph (km/h)

R

106 (170)

S

112 (180)

T

118 (190)

U

124 (200)

H

130 (210)

V

149 (240)

ZR

abov e  

149

(240)

l

h

c

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2

WHEELS AND TYRES

Wheel rim: Identification

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The wheel rims are marked in one of two ways:

- engraved marking for steel wheel rims,

- cast marking for alloy wheel rims.

The marking gives the main dimensional specifications
of the wheel rim.

The marking may be:

- complete, for example 5 1/2 J 144 CH 36;

- simplified, for example 5 1/2 J14.

The wheel bolts are positioned in a circle with a diame-
ter of100 mm (four mounting bolts).

The maximum run-out is measured at the rim edge .

Type of wheel

5.5 J 14

1

Width (in inches)

5.5

2

Rim edge profile

J

3

Nominal diameter (in inches)

14

4

Number of holes

4

5

Tyre bead profile

CH

6

Offset (in mm)

36

100988

1

6

7

4

5

2

3

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3

WHEELS AND TYRES

Balancing

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I - PREREQUISITES FOR WHEEL BALANCING

Wheel balancing is a measurement operation.

Several conditions must be met to achieve a reliable re-
sult in a single operation.

The wheel balancer must be installed in accordance
with the manufacturer's instructions.

Never grease the threaded shaft.

Check the condition of the supports, centring compo-
nents and mountings.

Replace any faulty parts (see manufacturer's instruc-
tions).

The wheel and the wheel balancer must be clean.

1 - Wheel

Clean the bearing and centring faces.

Remove any gravel trapped in the tyre treads.

Clean the wheels.

2 - Wheel balancer

Make sure the wheel balancer bearing surface and all
the centring equipment (ring, thrust plate, etc.) are kept
clean.

II - WHEEL REMOVAL AND WHEEL BALANCING

1 - Driver's observation

If the wheels are not correctly balanced this causes the
steering wheel and/or the vehicle floor to vibrate.

The vibrations occur at between 56 mph (90 km/h) and
93 mph (150 km/h).

After the road test:

- lift the vehicle immediately,

- leave the four wheels suspended,

- release the automatic parking brake.

Remove the wheels, positioning the valves upwards.

Be sure to clean the wheel, disc, and hub bearing sur-
faces.

To reproduce the exact vehicle wheel assembly, it is
essential to fit a 60 mm diameter cylindrical centrer on
the wheel balancer.

The wheel is fitted on the wheel balancer as follows:

- (1) wheel balancer back-plate,

- (2) ring, diameter 60 mm,

- (3) wheel,

- (4) wheel locking tool.

After switching on the wheel balancer and entering the
specific wheel parameters, select the « end » balan-
cing mode.

WARNING

Perform  a road test of at least 1.25 miles (2 km)
before the wheel balancing operation to prevent a
flat spot forming on the tread when the vehicle is
stationary.

105870

105871

1

2

3

4

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4

WHEELS AND TYRES

Balancing

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Place the wheel on the wheel balancer, with the valve
at the top, then lock the wheel in place.

Check that the wheel is not deformed because of acci-
dental impact. If it is, replace the deformed compo-
nents.

Remove any grit which may be jammed in the tyre
treads.

Start the wheel balancer and check that the wheel ba-
lance is below 5 g (dynamic) and 10 g (static).

Otherwise, remove the old balancing weights and re-
peat the wheel balancing procedure to obtain a value
below 5 g on each wheel surface and a value below 10
g when static.

Repeat this operation on the other vehicle wheels.

2 - Balance weights

Only use spare parts weights:

- secured by hooks to steel wheel rims (hooks incorpo-

rated in the weight),

- secured using (flat) hooks, or self-adhesive weights,

for alloy wheel rims.

100681

88659

(5)

Steel wheel rim

(6)

Alloy wheel rim

5

6