1994 JAGUAR XJ6 differential

Driveshafts & Final Drive
. Remove upper link assembly from differential and wide mounting bracket / 'A' frame.
. Release fixings, 'A' frame to differential, 'A' frame to wishbone tie and wide mounting bracket to 'A' frame.
. Remove wishbone tie assembly, rear mounting bracket and pendulum assembly.
. Release fixings differential nose to wide mounting bracket.
. Assembly and fitting is the reversal of this procedure, taking note of the following:
Drive shaft must be aligned in accordance with Sub
-Section 9.2.
Renew all self locking nuts.
Renew all bolts that were originally fitted with thread locking adhesive.
Replace all locking wire and split pins (cotter pins).
Tighten all fixings to the specified torque.
Correct the final drive oil level
if required.
Check and adjust rear wheel camber setting as required.
9.9 AXLE SHAFT ASSEMBLY, RENEW
SRO
47.10.01
Disconnect vehicle battery ground lead.
. Slacken appropriate axle shaft hub nut.
. Support the vehicle at the rear and remove rear road
. Remove brake caliper in accordance with 70.55.03. Sec-
wheel.
tion 12, but do not disconnect hydraulics.
Slacken hub carrier fulcrum and remove ABS sensor from
hub carrier.
. Remove axle shaft hub nut and collar.
. Remove fixings axle shaft to differential output shaft
flange, note camber shim.
. With service tools JD 1D/7 (Fig. 1) and JD ID (Fig. 21, push
shaft through hub.
. Remove axle shaft assembly.
CAUTION: Take care not to introduce debris into the hub
bearings, or damage seal.
. Prior to assembly, remove all traces of adhesive from hub
. Assembly and fitting is the reversal of this procedure
Adhesive should be applied to axle shaft splines over
a radial area of
30 to 50%.
Renew all bolts that were originally fitted with thread
locking adhesive.
Replace all locking wire and split pins (cotter pins).
Tighten all fixings to the specified torque.
Check and adjust rear wheel camber setting.
Verify operation of brakes.
Renew all self locking nuts.
splines.
taking
note of the following:
0
NQ&: The axle shaft nut is a self-locking item with a thread
insert and must NOT be reused.
Fig. 1
Fig.2
- Iss ue 1 August 1994
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7 X300 VSM

With the vehicle travelling straight ahead, the valve restrictions are balanced, thus providing equal pressure on each
side of the piston. When load is applied at the steering wheel the two halves of the pinion valve are displaced making
the restrictions unequal. The differential pressure then directs the rack piston in favour of the higher pressure.
Asthe turning load is removed the pressures equalize and the steering returns to the straight ahead position, aided by suspen-
sion geometry.
The displacement
of the halves of the pinion valve (rotor and sleeve) is controlled by the elastic deformation of the
torsion bar which is concentric with the pinion and valve.
0 N
J Outlet K Outlet
L Inlet
M Inlet
N Radial groove (return)
0 Radial groove (feed) P Feedgroove ~57-278 Q Axial groove
R Axial groove S Return groove
Fig.1 Porting & hydraulic flow - LOW speed clockwise rotation
Issue 1 August 1994 X300 VSM 3

@ Steering
The rotaryvalve within the pinion housing on the 'Servotronic'system is fitted with a 'Hydraulic Reaction Piston' (HRP). The HRP moves axially, relative to the rotor, on ball bearing travellers (acting as a face cam) and is connected to the
sleeve
by a four bearing helical screw. Pressure applied eitherside of the HRP is translated into a rotational force which
resists torsion bar /valve displacement thus increasing steering effort. The amount of pressure applied to the HRP is
controlled by: a) the differential pressure on the rack piston, proportional tovehicle corneringforce and
b) the position
of the transducer valve controlled bythe SCM from information gathered on road speed. Road speed data is processed
from the left hand rear wheel speed sensor.
1 Electronic speedometei
2 SCM 3 Transducer 4 Reaction area 5 Reaction area
6 Checkvalve 7 Checkvalve
8 Choke 9 Choke
10 Reaction limitina valve 157-279 11 Reaction piston-
N Radial groove (return)
0 Radial groove (feed)
Fig.1 Sensors, valves & hydraulic flow - HIGH speed anti-clockwise rotation
X300 VSM Issue 1 August 1994 4

Suspension Systems
Fig. 1 Rear Suspension layout
11.3 REAR SUSPENSION, DESCRIPTION
The vehicle's rear suspension layout features a cast wishbone complete with integral lower spring pan (1 Fig.1) sup- porting the independently mounted damper (2 Fig.1) and road spring (3 Fig.1).
Thelowerwishbonearmis boltedtothehubcarrier(4 Fig.1) by meansofa pivot bolt (5Fig.l),allowingfortoe-in adjust- ment. When the pivot bolt is seated correctly in the plate located on the wishbone arm, it has a small clearance at the
sides but full clearance at the top and bottom.
Rotation of the bolt head, with eccentric constrained between the vertical faces, causes the bolt shank to be moved in
the horizontal plane, thus displacing the hub carrier and effecting wheel alignment adjustment.
The snubber
(6 Fig.1) positioned above the hub carrier, prevents this from touching the vehicle body.
The hub
carrier/wishbone assembly, is pivoted on the wishbone fulcrum bolt (7 Fig.1) and is then secured by a nut and
washerfixing arrangementtothe pendulum assembly (8 Fig.1) andthe wishbonetie assembly (9 Fig.l).The differential
strut (10 Fia.1) is fastened to the wishbone tie assemblv and to a bracket, welded to the vehicle bodv. Both, the pendu- lum and the wishbone tie assembly are fitted to the differential unit which is mounted on to a mounting frame and a rear frame carrier.
The supercharged vehicle (manual only), the XJ12 and the sport versions are equipped with
a rear stabilizer bar, a dif- ferential monostrut instead of two single struts, a modified wishbone tie and two stabilizer bar drop links which are
seated on the lower wishbone cast bosses.
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Issue 1 August 1994 X300 VSM

Body Components & Trim ~
issue 1 August 1994 X300 VSM 21
13.3.17 Fascia Board, Renew
SRO 76.46.01
. Remove
the battery cover and disconnect the battery.
Remove the drivers side and passenger side underscuttle
pads, see sub
-sections 13.3.19 and 13.3.20.
. Remove the drivers airbag module, see section 15.5.
Remove the steering wheel, section 10.
Remove the drivers side and passenger side fascia closing
. Remove the fascia center veneer panel, see subsection
Remove the fascia board for access, see subsection
. Disconnect the air conditioning differential potentiometer
Remove the differential potentiometer assembly.
. Displace and reposition the through panel connectors
from the fascia assembly.
. Displace the fascia vent motor / gearbox assemblies har- ness multi-plug from the mounting bracket.
. Disconnect and reposition the fascia harness to console
harness
multi-plug from the mounting bracket.
. Disconnect the BPU harness multi-plugs.
Remove the tiestraps securing the harness to the fascia.
. Reposition the fascia on a bench.
= Displace and reposition the solar sensor assembly from
Disconnect the solar sensor harness multi-plug.
Remove the solar sensor assembly.
= Undo and remove the defrost vents securing screws.
Displace and reposition the defrost vent assemblies.
. Disconnect the tweeter speaker harness multi-plugs.
. Remove the defrost vent assemblies.
. Displace the fascia harness grommet from the fascia.
. Route the harness through the aperture.
Remove the fascia harness assembly.
. Undo and remove passenger airbag deployment door to
fascia securing bolts ( one bolt is removed with the fascia).
. Displace and remove the deployment door assembly.
. Undo and remove the passenger airbag module to fascia
. Displace and remove the airbag module assembly.
. Undo and remove the airbag module I BPU mounting
bracket assembly to fascia securing nuts 1 bolts.
= Displace and remove the mounting bracket assembly.
. Retrieve the spacing washers.
. Displace and remove the side vent outlets from the fascia.
. Displace and remove the side vent ducts securing clips.
. Displace and remove the side vent ducts.
. Undo and remove the center vent flap assembly to fascia
. Displace and remove the center vent flap assembly.
Undo and remove fascia location bracket securing nuts.
Displace and remove the location bracket.
panels, see
sub
-sections 13.3.22 and 13.3.21.
13.3.23. 13.3.17.
harness multi
-plug.
the fascia.
securing bolts.
securing nuts.

Body Components & Trim
. Reposition and fit the motor/gearbox assemblies harness
. Fully seat the through panel connectors to the fascia.
. Place the air conditioning differential potentiometer to the
fascia and route the differential potentiometer harness
through the vent aperture.
. Reconnect the differential potentiometer harness multi-
Plug.
Refit the fascia board.
. Refit the center veneer panel.
. Refit the fascia closing panels.
. Refit the steering wheel.
. Refit the drivers airbag module.
. Refit the underscuttle pads.
. Reconnect the battery and refit the battery cover.
multi
-plug
to the mounting bracket.
X300 VSM 23 Issue 1 August 1994

Body Components & Trim -
13.3.23 fascia Cenfer Veneer Panel, Renew
SRO 76.47.06
. Fit and align the special tool JD 202 to the center vent as-
. Displace and reposition the center vent assembly.
. Remove the special tool from the vent.
. Displace and remove the center vent assembly from the
. Place the center vent assembly on a bench covered with
. Remove and discard the veneer panel to center vent as-
. Displace and remove the veneer panel from the center
Fit and align the new veneer panel to the center vent.
. Fit and fully seat the veneer panel securing clips.
. Place the center vent assembly to the vehicle.
Fit and fully seat the vent assembly to differential control
. Fit and fully seat the center vent assembly to the fascia.
sembly.
See
Fig. 1.
variable differential control potentiometer.
a suitable cloth.
sembly securing clips.
vent.
potentiometer.
._-
Fig. 1
X300 VSM Issue 1 August 1994 28

Climate Control Systems
. Centre vent flap
Foot flap
Defrost flap
I I
14.5.2 Control Module Interfaces
. Recirculation switch
. Air con onloff switch
. System onloff switch
. Auto. / Man. select
. Set temperature
. Air flow outlet mode set
. Heated front screen switch
. Heated rear screen &
. External temp. display
. FahrenheiVCentigrade
heated mirror switch
switch
switches
. Solar sensor
. Motorized in-car aspirator
. Ambient temp. sensor
9 Evaporator temp. sensor
. Heater matrix temp. sensor
. Compressor lock sensor
. Face differential temp. control
. Refrigerant pressure switch
. Engine speed signal
. Engine coolant temperature
Vehicle speed signal
Circulation pump
. Coolant flow valve
. Power transistor (fan speed
= Servo motor potentiometers:
signal
control)
LH air inlet flap
RH air inlet flap
Centre vent flap
Foot flap
Defrost flap
Air by
-pass flap
CONTROL PANEL
4
-
4
4
4
4
4
4
A 1 CCM
e I . External temp. display
. Coolant recirculation valve
. Coolant recirculation pump
Cool air by-pass
Air Flow Speed Control
. LH blower motor & power transistor
. RH blower motor & power transistor
. LH high speed relay
. RH high speed relay
. LH air inlet
. RH air inlet
. Compressor
- . Front screen heater (to EMS)
- . Heated rear screen
and door mirrors
Fig.
1 Schematic view AI CCM Inputs & Outputs
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Issue 1 August 1994 8 X300 VSM