1998 JAGUAR X308 suspension

Suspension System - General Infor
mation - Front Toe Adjustment
Gen
eral Procedures

1.
NOTE: Before checking or adju sting front wheel alignment,
examine the vehicle for curb impact damage on wheels and
subsequent damage to steering and suspension components.
• NOTE: Wheel alignment must no t be carried out with a space
saver wheel installed on any of the hubs.
• NOTE: Before carrying out any ch ecking or adjustment of wheel
alignment, ensure that the vehicl e wheels, tires and tire pressures
are to Jaguar specification.
• NOTE: Position steering wheel in straight ahead position before
adjusting front wheel toe evenly on both tie rods to maintain
centralization of steering wheel.
Position alignment checking equipment on road wheels and
following equipment manufacturer's instructions, check and if
necessary adjust front wheel toe to Specifications in Section
204-01.

Suspension System - General Inform
ation - Rear Toe Adjustment
Gen
e
ral Procedures

1.
NOTE: Wheel alignment must not be carried out with a space
saver wheel installed on any of the hubs.
• NOTE: Before carrying out any ch ecking or adjustment of wheel
alignment, ensure that the vehicl e wheels, tires and tire pressures
are to Jaguar specification.
• NOTE: Before checking or ad justing rear wheel alignment,
examine the vehicle for curb impact damage on wheels and
subsequent damage to suspension components.
Position alignment checking equipment on road wheels and
following equipment manufacturer's instructions, check and if
necessary adjust rear wheel alignment to Specifications in
Section 204-02.

Suspension System - General Information - Wheel B
earing Circlip
Inspection
Gen
eral Procedures


1.
Wh
en installing the bearing circli
ps in the vertical link ensure
that the ears are located at the lowest position to permit water
drainage.
To achieve this, a perpendicular line drawn through the
suspension upper ball-joint will indicate the position of the gap
between the circlip ears. This procedure makes an allowance for
the caster angle prior to installing the vertical link.

Suspension System - General Information - Wheel Bearing Inspection
Gene
ral Procedures


1.
Dur
ing use, a small amount of surplus grease may appear
around the bearing seal, this does not indicate a failed bearing
or seal. The grease should not be removed as this will act as an
additional barrier to the ingress of water or foreign matter.
Excessive end float or bearing ru mble will indicate a failed
bearing; for maximum permissibl e end float see specification
section. Take care not to confuse suspension ball joint or upper
or lower fulcrum bu sh movement for bearing end float.
If the hub is removed for any reason, a new bearing assembly
must be installed. Never at tempt to re-use a bearing.

Front Suspension -
Lubri
cants, Fluids, Sealants and Adhesives
Press-In Loads
Torques


UnitS
pecification
Loctite27

0
Greas

e
Shell Retin
ax 'A'
Greas

e
Castro
l 'NTR'
Com

ponent
Kn
Ball join

t to upper wishbone
25
- 50
B

all joint to lower wishbone
25
- 50
Com

ponent
Nm
N

ut - ball joint, upper wishbone to vertical link.
60
-80
N

ut - ball joint, lower wishbone to vertical link.
60
-80
Nu

t - fulcrum bolt, upper wishbone.
60
-80
N

ut - ball joint, tie rod to steering arm.
71
-85
Bol

t - wheel speed sensor to vertical link.
8-1
0
Bol

t - front mounting to crossbeam.
22
-28
Bolt

- mounting , stabilizer bar.
30
-40
N

ut - link arm ball joint to stabilizer bar.
60
-80
Bolt

- mounting, steering rack to crossbeam.
41
-54
B

olt - front mounting, crossbeam to body.
22
-28
Bol

t - spring pan to lower wishbone.
70
-90
N

ut - shock absorber to upper mounting
(vehicles with adaptive damping).
16
-18
Nu

t - shock absorber to upper mounting (vehicles without adaptive damping).
30
-40
N

ut - shock absorber lower to wishbone.
43
-57
B

olt - engine Hydramount to crossbeam.
34
-46
B

olt - crossbeam rear mounting to body.
13
1-185
Bol

t - generator cooling du
ct deflector to crossbeam.
17
-23
N

ut - lower steering column to pinion shaft.
22
-28
N

ut - hub, speed sensor rotor.
27
0-330
B

olt - shield, brake disc.
9-1
2
Bol

t - lower wishbone, front arm to rear arm.
77
-103
Nu

t - stabilizer bar link arm to wishbone bracket.
41
-54
N

ut - wishbone front
eccentric bolt.
11
3-153
Nu

t - wishbone rear
eccentric bolt.
11
3-153
N

ut - fulcrum shaft, upper wishbone.
60
-80
Bolt -

power steering pi
pes to pinion housing.
9-1
2

Front Suspension - Front Suspension
Description and Operation


Ite
m
Par
t
Number
De
scr
iption
1—Suspensi
on C
rossbeam
2—Hub Assembly
3—Sprin
g

4—Shock Absorber
5—St
abil
izer Bar

Front C
rossbeam
A
fully stressed, pressed steel and tube fa
brication with integral lower wishbone tie bars, the crossbeam is secured to the
body on four resilient mountings.
The crossbeam incorporates mounting points for:
The u
pper and lower wish
bone fulcrum bolts.
The
stabilizer bar
The power steering rack. The engine h

ydramounts.
R

oad springs.
Slots and cam reaction pl ates on the crossbeam provide for ad justment of suspension geometry.
It
em
Par
t Number
De
scription
1—Cro

ssbeam
2—Upper

Wishbone
3—Lower Wi

shbone Arm, Front
4—Lower Wi

shbone Arm, Rear
5—Upper

Wishbone Ball Joint
6—Lower Wi

shbone Ball Joint
7—Ful

crum Bolt

8—Adjuster B
olt, Front
9—Adjuster B

olt, Rear
10—S

pring Pan
11—Shock Absorber Lower M

ounting Plate
12—Vertical Link


13—Hub Assembly
14—Sensor R

otor
15—B

olt, Wishbone to Link Arm

Upper
Wishbones
Each
upper wi
shbone assembly is a on
e-piece steel forging incorporating:
A pres
s-fit ball joint.
Press-fi

t bushes for location of the upper fulcrum bolt.
Lower Wishbones
Each l
o
wer wishbone comprising
forged steel front and rear arms bolted together, incorporates:
A p
ress-fit ball joint in the outer extremity of the rear arm.
Press-f
i
t bushes for location of the lower fulcrum bolts
Locati
on for the shock absor
b
er lower mounting plates.
Vertica l Links

The vertical
links are of forged steel
wi
th integral steering arms. Each is suppo rted between the upper and lower wishbones
by two ball joints and carries:
Front hub

Brake ca
liper and disc shield assembly

ABS se
nsor
.
Front Hub
s

Each f
o
rged steel front hub accommodates sealed for life cartridge
type wheel bearings, and carries:
The brake rotor assembl
y.
A
h
ub nut with toothed, integral ABS rotor.
Su
s
pension spring pi
n locking device.
Front Road
Springs
The road spri
ng
s are of coil type with their
rating dependent upon vehicle specification
Ea
ch spring is installed between the suspension crossbeam location and the lower wishbone spring pan.
Ru
bber seats ar
e installed betw
een the spring and the crossb eam and the spring pan.
Front Shock A
bsorbers
Th
e
shock absorbers are telescopic hydrau
lically operated units. Optional adaptive damping units incorporate a solenoid-
operated control valve at their upper extremity.
Each shoc
k absorber is installed between the lowe
r wishbone rear arm and a recess in the body.
The l
o
wer end of the shock absorber is se
cured to plates on the wishbone by a bolt that also serves as a pivot.
The u
pper en
d of each shock absorber is secured to the body location by a single nut.
Front Sta
b
ilizer Bar
A
front stabil
izer bar installed on all vehicles
is rated according to suspension specification.
Opera
tion
As each road wheel r
i
ses, move
ment is transmitted through the vertical link assembly to the lower wishbone. The resulting
rise of the wishbone compresses the road spring and partially telescopes the shock absorber. During this action, the spring
absorbs associated shocks and the shock absorber minimizes sprin
g os c
illation.

Du

ring cornering, vehicle weight
is transferred to the outer road wheel with a resulting tendency for the inner wheel to lift.
The stabilizer bar assists in minimizing this tendency by transf erring a proportion of potential lift of the inner wheel to the
outer wheel. This result s in enhanced body stability with improved corner ing capabilities.