JAGUAR X308 1998 2.G Workshop Manual

W
heels and Tires - Wheels and Tires
Description an
d Operation
Wheel Desi

gns
• C
AUTIONS:
The type of wheel design that can be installed to the vehicle is influenced by the vehicle's braking system. The
optional Brembo brake has a larger disc diameter than the stan dard brake, therefore restricting what size of wheel can be
installed to vehicles fi tted with Brembo brakes.
The Milan and RK wheels can be installed to all vehicles; all other wheels must only be installed to vehicles fitted with
standard brakes.

Wheel C
hanging
For wheel
chan
ging proced
ure refer to 74.20.05.
CAUTION: Do not allow grease to contaminate the wheel stud threads and wheel nut to wheel mating surface, as this
may cause the nuts to loosen.
• NOTE: When installing the wheel, smear a thin layer of grease onto the hub mounting face and spigot; and wheel
mounting face and spigot hole, to prev ent the wheel corroding on to the hub.
Locking Wheel Nuts

Locking wheel nuts are fitted as standard to UK vehicles.
1—Stee
l Wheel Trim 7J x 16
2—St
arbur
st Alloy 7J x 16
3—Cro
w
n Alloy 7J x 16
4—Sol
a
r Alloy 7.5J x 17
5—Ce
lt
ic Alloy 8J x 17
6—Lunar All
oy 7J
x 16
7—As
te
roid Alloy 8J x 18
8—Cor
ona Al
loy 7J x 16

9—Ecli
pse Alloy 8J x 16
10—Mi
lan All
oy 8.5J x 18
11—R
K
Winter Wheel 8.5J x 18
It
e
m
Par
t
Number
De
scr
iption
1—Lockin
g whe
el nut
2—Cov
e
r
3—Cov
e
r removal tool
4—Wre
n
ch socket

It
e
m
Par
t
Number
De
scr
iption

O
ne locking wheel nut is fitted to each road wheel and can on
ly be removed by using the correctly coded socket. For road
wheels with exposed wheel nuts, each locking wheel nut is provided with a cover, which is removed using the cover removal
tool.
Locking wheel nuts have different coded keyway combinations with corresponding coded sockets. The correct socket, and
cover removal tool are supplied with the vehicle toolkit. Sets of sockets are available to Jaguar dealers.
Temporary Spare Wheel
•
NOTE: When using this type of spare wheel note that:
Speed

must not exceed 80 km/h (50 mph).
The normal ro

ad wheel must be reinstalled as soon as possible.
On

ly one temporary wheel may be installed to the vehicle.
Tracti

on control (where fitted
) must be switched OFF.
In certain markets, the spare wheel supplied with the vehicle is of the temporary-use type, it is narrower than the normal
road wheel and takes up less room in the luggage compartment.
Tire
s
The
radial ply tires shown in the 204-04
Specification Section are recommended by Jaguar to meet the high speed
performance of the vehicle. Only tires of identical specification may be fitted as replacements. Unde r no circumstances must
cross-ply tires be fitted.
Tire Inflation Pressures
Al
l recommended tires, including winter tire
s, must be inflated to the pressures shown in the 204-04 Specification Section.
Inflation pressures must only be checked when the tires are cold.
Tire Replac
ement and Wheel-Interchanging
W
hen renewal of tires is necessary, it is
preferable to fit a complete set. If two replacement tires are fitted (to one axle),
they must be of the same manufacturer and type as those on the other axle.
No attempt must be made to interchange wh eels from the front to the rear or vice-versa, as wear produc es a characteristic
pattern on each tire depending upon its po sition on the vehicle. If this position is changed after wear has occurred, the
performance of the tire w ill be adversely affected.
It should be remembered that new tires must be balanced befo re installing to the vehicle.
Win
ter Tires
•
NOTE: Speed must not exceed 210 km/h (131 mph) when winter tires are installed.
Jaguar recommended winter tires as specified in 204-04 Specification Section must only be fitted in complete four-wheel
sets of the same type and size.
Snow Chains and Spike Spider Traction System

Jagu
ar recommended snow chains, must on
ly be installed when using 16 inch wheels with 255/60 R16 winter tires.
• NOTE: When using snow chains or the spike spider traction system, note that:
Snow ch
ains and the spike spider
traction system must only be fitted to the rear wheels.
O
nly Jaguar recommended snow chains and spik
e spider traction system must be used.
The m
aximum permissible speed with winter tires and snow chains or the spike spider traction system fitted is 48
km/h (30 mph).
Tracti
on control (where fitted) must be
switched OFF when using snow chains or the spike spider traction system.

Snow chain
s and the spike spider tr
action system must not be used on roads which are clear of snow.
The Jaguar recommended spike spider tracti on system can be used on all wheel and tire sizes, except the temporary spare
wheel.
Asym metric
Tires
Some
tir
es recommended by Jaguar are as
ymmetric. Inner and outer markers embossed on the tire walls must be observed
to ensure the correct installati on of the tire to the wheel.
Tread We
ar Indicator
• NO
TE: Tire condition must comply with prevailing local legislation.
Tread wear indicators are molded into the bottom of the tr ead grooves across the width of the tire. The tire must be
renewed when tread wear indicators become visible at the surface of the tread.

W
heels and Tires - Wheels and Tires
D
iagnosis and Testing
General Not

es
1.
1. Factory in
stalled tires and wheels are designed to provide optimum ride and ha
ndling characteristics when inflated
to the recommended inflation pressures, with vehicle loads not exceeding the full-rated load capacity.
2. 2. Correct tire pressures and driv ing technique have an important influence on tire life. Heavy cornering, excessively
rapid acceleration and unnecessary sharp braking increase tire wear.
3. 3. Replacement tires should follow the recommended:
Size
.
Speed

rating.
Load range. Radial c

onstruction type.
4. 4. The use of any other size or type of wheel / tire may seriously affect:
Safety. Ri
de.
Handlin

g.
Speed

ometer / odometer calibration.
Vehi

cle ground clearance.
Ti

re clearance between
body and chassis.
Wh
eel bearing life.
Brake cooli

ng.
5. 5. Wheels must be renewed when:
Impact damaged. Heavil
y corroded.
Porous W

heel stud holes or se
ats become damaged.
They h
ave excessive radial or lateral runout.
Safety Notes
• WAR

NINGS:
DO NOT MIX DIFFERENT TYPES OF TIRES ON THE SAM E VEHICLE, HANDLING MAY BE SERIOUSLY AFFECTED
RESULTING IN LOSS OF CONTROL.
DO NOT MIX DIFFERENT TYPES OF TIRES ON THE SAM E VEHICLE, HANDLING MAY BE SERIOUSLY AFFECTED
RESULTING IN LOSS OF CONTROL.
A TIRE AND WHEEL MUST ALWAYS BE CORRECTLY MATCHED. WIDER OR NARROWER TIRES THAN RECOMMENDED
COULD CAUSE DANGER THROUGH SUDDEN DEFLATION.
WHEN USING THE TEMPORARY SPARE WHEEL, SPEED MUST NOT EXCEED 80 KM/H (50 MPH). DRIVE WITH CAUTION
AND REPLACE WITH THE SPECIFIED WHEEL / TIRE ASSEMBLY AS SOON AS POSSIBLE.
TRACTION CONTROL (IF AVAILABLE) MUST NOT BE ENGAGED WITH THE TEMPORARY SPARE WHEEL FITTED.

WHE
N CHANGING A WHEEL, ENSURE THAT THE VEHICLE CANNOT MOVE. ALWAYS APPLY THE PARK BRAKE AND
SELECT TRANSMISSION 'P' POSITION.
NEVER RUN THE ENGINE WITH ONE WHEEL OFF THE GROUND, FOR EXAMPLE, WHEN CHANGING THE WHEEL. THE
VEHICLE COULD MOVE.
TIGHTEN THE WHEEL NUTS TO SPECIFICATION. WHEELS MAY COME LOOSE IF OVER OR UNDER TIGHTENED.
USE WHEELS AND WHEEL NUTS DESI GNED FOR XJ SERIES VEHICLES ONLY. AFTERMARKET WHEELS OR WHEEL
NUTS MAY NOT FIT OR FUNCTION PROPERLY AND COULD CAUSE INJURY OR DAMAGE.
In
spection and Verification
To maximize ti
re performance, inspec
t the tires frequently for signs of:
Unev
en wear.
Incorrect
ti
re pressure.
Wh
ee
l imbalance.
Cuts. Abrasi
ons.

B
u
lges (blister).
Ply s
e
paration.
Embedded objects. Impact damage.
Inspe c
tion should be
more frequent when:
Continuo
us high speed op
eration is required.
Ra
pid or extreme temperatures changes occur.
R
o
ad surfaces are rough.
Roads ar
e littered
with debris.
Tread W
e
ar Indicator
•
NO
TE: Tire condition must comply with prevailing local legislation.
New tires must be installed if the wear in dicators are exposed or if there is severe shoulder wear. Shoulder wear is usually
caused by either excessive camber or toe on tires.
T i
re Vibration Diagnosis
A
tir
e vibration diagnostic procedure always
begins with a road test. The road test and the custom er interview (if available)
will provide much of the information need ed to find the source of vibration.
During the road test, drive the vehicle on a road that is smooth and free of undulations. If vibration is apparent, note and
record the following:
The s p
eed at which the vibration occurs.
W
h
at type of vibration occurs in each
speed range - mechanical or audible.
How the vibrati
on is affected
by changes in the following:
- -engine torque
- -vehicle speed
- -engine speed.
Type of v i
bration - sensitivity:
- - torque sensitive,
- - vehicle speed sensitive,
- - or engine speed sensitive.

The
following explanations will help isolate the source of vibration.
Torque Sensitive
This

means that the condition can be impr
oved or made worse by accelerating, dece lerating, coasting, maintaining a steady
vehicle speed, or applying engine torque.
Ve
hicle Speed Sensitive
This means th
at the vibration al
ways occurs at the same vehicle speed and is not affected by engine torque, engine speed
or gear selection.
Engine Speed Sensit
ive
This means th
at the vibration
occurs at varying vehicle spee ds when a different gear is selected. It can sometimes be
isolated by increasing or decreasing engine speed with the tran smission in neutral or by stall testing with the transmission in
gear. If the condition is engine speed sensitive, the cause is probably not related to tires.
If the road test indicates that there is tire wine, but no shake or vibration, the noise originates with the contact between th e
tire and the road surface.
A thumping noise usually means that the tire is flat or has soft spots making a noise as they slap the roadway. Tire whine
can be distinguished from axle no ise, as tire whine remains the same over a range of speeds.
Sym
ptom Chart
Sy
mptom Chart
Sy

mptom
Possib
le Sources
Acti
on
Uneven ti

re wear.
Incorrect ti
re inflation.
*
Cor
rect to specification.
*
Exce
ssive radial an
d lateral runout.
*
Renew tire
or wheel.
*
O
ut of specification steering
geometry.
*
R
ealign steering geometry: Refer to Section 204-
00.
*
W
orn ball joint.
*
Renew
damaged component, realign steering
geometry.
*
W
orn tie-rod end.
*
R
enew component, realign steering geometry.
*
Incorrect
tire / wheel usage.
*
Inst
all correct tire and wheel combination.
*
Loose or leaki
ng shock absorbers.
*
Tigh
ten or Renew as nece
ssary: Refer to Section
204-00.
*
Suspensi
on geometry out of
alignment.
*
Che
ck and adjust: Refer to Section 204-00.
*
Loose, worn or da mage
d suspension
components.
*
In
spect, Repair or Renew as necessary.
*
Wh
eel and tire assembly out of
balance.
*
Balance wheel an
d tire assembly.
*
Excessive later
al or radial runout of
wheel or tire.
*
Check, Repair o
r
Renew as required.
*
Tire
s show excess wear on

edge of treads.
Ti
res under-inflated.
*
Cor
rect pressure to specification.
*
Vehi
cle overloaded.
*
Cor
rect to specification.
*
Tire
s show excess wear on

edge of treads (with tire
pressures correct).
Incorre
ct toe setting.
*
Se
t to specification: Refer to Section 204-00.
*
Tire
s show excess wear in
center of tread.
Tire
s over-inflated.
*
Cor
rect pressure to specification
*
W
heel mounting is
difficult.
Incorrect app
lication or mismatched
parts, including wheel studs and
wheel nuts. Corroded, worn or
damaged parts.
*
Fol
low the manufacturer's specifications. Clean or
Renew.
*
Wobble or sh
immy
affecting wheel runout.
Damaged wh
eel (eventually
damaging wheel bearings and causing
uneven tire wear).
*
Inspect wheel rims for
damage and runout. Renew
as required.
*
Vehicle vibrations from

Tire
s / wheels mismatched.
*
Inst
all correct tire / wheel combination.
*

wheels
and tires.
Infl
atio
n pressure too high or low.
*
Cor r
ect pressure to specification
*
Uneven ti re wear.
*Re fe
r to Diagnosis and Testing in this section.
*
Wh ee
l and tire assembly imbalance.
*
Balance wheel an d tire assembly.
*
Brake disc imbalan c
e.
*
Check brak e disc co
oling fins for mud and foreign
material. Check for damage or disc heavy spot.
Refer to Section 206-00.
*
Damaged or distor
ted wh
eel.
*
Renew wh eel.
*
Excessive radial run-o
ut of wheel or
tire. Excessive lateral run-out of wheel or
tire.
*
*
Renew wh
eel or tire.
*
Incorrectl y
seated tire.

*
R e
mount the tire.

*
Loose wh eel mo
untings: damaged
wheel studs, whee l nuts, worn or
broken wheel hub face or foreign
material on mounting faces.
*
Tigh
te
n or Renew worn or
damaged parts. Clean
mounting surfaces.
*
De
fe
ctive wheel bearings.
*
Renew worn
or damaged bearing sets: Refer to
Section 204-00.
*
W
a
ter in tires.
*
R e
move water.
*
Damaged wh eel stud
thre
ads.
Sli
d
ing wheel across the wheel studs
during installation. Loose wheel nuts.
*
Renew wh
eel studs.
*
Broken wh eel
studs.
Loose or overti
ght
ened wheel nuts.
*
Renew wh eel studs.
*
C o
rrosion / contamination
streaks from wheel stud
holes.
Loose wh eel
nuts.
*
Chec k com
plete assembly. Renew damaged parts.
Apply correct torque setting.
*
Damaged wh
eel nu
ts.
Loose wh
eel
assembly.
Over-tightened wheel nuts.
*
*
Renew wh
eel nu
ts. Apply correct torque setting.
*
Se ize
d wheel nuts.
Cor
rosion

*
CAUTI O
N: Do not permit lubricant to
contaminate wheel hub stud holes or wheel nut seats.
If corrosion is light, wire brush away corrosion. If
corrosion is excessive renew wheel studs and wheel
nuts. Lubricate th e first three threads of wheel
studs with a graphite based lubricant.
*

W
heels and Tires - Wheel and Tire
Re
moval and Installation
Remov

al
CAUTI
ON: Do not use heat to loosen a seized wheel nut: heat will change the metal's properties and damage wheel
bearing and brake caliper seals.
I
nstallation

1.
NOTE
: Certain Jaguar wheels are fitted wi
th a hexagon wheel
nut cover
R
emove the cover with the plastic spanner supplied with
the spare wheel jacking equipment.

2. Loosen
, but do not
remove wheel nuts.
3. Raise vehicle and support on st ands. Refer to Section 100-02.

4. R
emove wheel and tire assembly.
1. Remove wheel nuts.
2. Remove wheel.
1. CAUTION: Do not allow grease to contaminate the wheel
stud threads and wheel nut to wh eel mating surface, as this may
cause the nuts to loosen.
• NOTE: To prevent the wheel corroding on to the hub, smear a
thin layer of grease onto the hub mounting face and spigot; and
wheel mounting face and spigot hole.

Instal
l the wheel an
d tire assembly.
1. Install wheel.
2. Install wheel nuts to secure wheel in position.
3. Lower vehicle.
4. Tighten wheel nuts in a diagonal sequence to:
Steel wh
eel 68-82 Nm.
Al
loy
wheel 88-102 Nm.