1994 JAGUAR XJ6 ECU

Pomrtrain Automatic Transmission (V12 & AJ16 Supercharged)
8.2.22 MANUAL DETENT SPRING, RENEW
SRO 44.26.10
9 Open the hood and fit a suitable fender cover.
. Raise the vehicle on a ramp.
. Drain the transmission lubrication system, see Sub-sec-
. Remove the fluid pan, see Subsection 8.2.14 (4,OL SC) or
. Remove the fluid filter, see Subsection 8.2.18.
. Select 'P (Park) and ensure that the pawl is engaged.
Release and remove the manual valve detent spring and
Remove the detent spring assembly and place aside.
. Clean the relevant parts.
Fit a new detent spring assembly to the valve body.
Fit but do not fully tighten the detent spring assembly to
the valve body securing bolts.
. Align the detent spring tocentralize the roller with the det- ent lever in the 'P' (Park) position.
. Check that in 'N' (Neutral), the shift lever is properly in
position. It is essential that the detent spring within the
transmission unit dictates to the shift lever and not the
other way around.
Finally tighten the detent spring assembly to valve body
securing bo
I ts .
(4,OL SC AND 6,011
tion 8.2.13.
Sub
-section 8.2.15 (6,OL).
roller assembly to valve body securing bolts.
. Refit the fluid filter, see Subsection 8.2.18.
Refit the fluid pan, see Subsection 8.2.14 (4,OL SC) or
. Lower the vehicle on the ramp.
. Refill the transmission unit with fluid, see Subsection 8.2.13.
. Remove the fender cover and close the hood.
Sub
-section
8.2.15 (6,OL).
X300 VSM 23 Issue 1 August 1994

Driveshafts & Final Drive
9.2 DRIVE SHAm, ALIGN
SRO 47.15.51
CAUTION: To preserve 'drive line' refinement, individual parts, other than fixings, MUST NOT be renewed. In the
event of any balance or drive shaft component related problem, the complete assembly must be renewed.
Under no circumstances must the flexible coupling (or its fixings) be loosened or removed from the drive
shaft flange.
Preliminary Checks
Before this procedure is actioned it is advisable to ensure that:
The gearbox mounting center stud is positioned centrally in relation to the crossmember inspection hole.
The crossmember is central on the body fixings and not 'hard over' to one side.
The differential spigot radial
run-out is within specification, see preliminary pages.
If the vehicle has been standing for
a period the tires may be 'flat-spotted'. If so, this will clear in approximate.;
400 km (250 miles). After this distance the source of vibration should be reassessed.
12 Cylinder
8 Remove exhaust center section.
All
8 Locate suitable 'plumb lines' over drive shaft outside diameter, but NOT over any balance weight or weld:
1.
2.
3.
l\lnfe:
Front section -behind gearbox output coupling, 12,7 mm (0.5 in) diameter weight (1 Fig. 1).
Rear section - immediately behind center bearing (2 Fig. 1).
Rear section - in front of differential flange (3 Fig. 1)
It is essential that the front weight should be as specified so that the different diameters of the two shafts may
be taken into account.
Method 1
8 Viewed from the rear with the rear 'plumb line' coincidental with the outside diameter of the front weight, the center
8 To re-align the center bearing, slacken bearing fixings and position to suit.
8 Tighten all fixings to specification ensuring that the 'anti-twist' plate is allowed to freely align before the center bear-
'plumb line' should align with the rear 'plumb line' (4 Fig. 1).
ing fixings are secured.
Fig. 1
1
JL7 OL3
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0 ~~~~
Issue 1 August 1994 2 X300 VSM

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Driveshafts & Final Drive ~ ~~~
Method 2
A refinement
to Method 1 may be made by stretching a line horizontally along the center line of the vehicle to touch
the outside diameter of the front weight and the rear ‘plumb line’. Take care not to bias the vertical lines with the hori- zontal line.
. Set the center ‘plumb line‘ to touch the horizontal line by movement of the center bearing (Fig. 1).
9 To realign the center bearing, slacken bearing fixings and position to suit.
. Tighten all fixings to specification ensuring that the ‘anti-twist’ plate is allowed to freely align before the center bear- ing fixings are secured.
I
6
101
H
-=I- ---
Fig. 1
Recommended /oca//y made tools
Plumb line Locally made Weight Locally made 12.7 mm (0,5 in) diameter mild steel
X300 VSM Issue 1 August 1994 3

@ Steering
Cause
Fluid level low?
Drive belt slack
(V12)
Pump drive loose (6cyl)
center pressures low
Air in system due to loose connection
Pump shaft seal faulty (fluid loss)
Delivery pressure or flow too low
Return flow restricted by blocked reser
-
voir filter
Both check valves blocked
Rack damper too
tight
Lower column incorrectly set
Excessive upper column friction
Faulty rotary valve or seal
Drive belt slack
(VI217
Engine idle speed too low
Pump drive loose
(6cyl)
Air in system due to loose connection
Pump shaft seal faulty (fluid
loss)
Delivery pressure or flow too low
Fluid level low?
tire pressures
high
Air in system due to loose connection
Stiff or seized steering joint
Rack damper too tight
Castor or tracking error
Lower column over extended
Fluid level low?
Air
in system due to loose connection
Pump shaft seal faulty (fluid
loss)
Rack damper loose
Pinion bearing faulty
Rack or column fixings loose
Rack mounting bracket loose
Rack mounting bush loose
Free play in column assembly
10.4 DIAGNOSTIC PROCEDURE
10.4.1 Introduction
The following diagnostic procedures are provided to rapidly pin-point mechanical faults which are not interrogated
by electrical means. Diagnostic procedures which require dedicated electrically operated equipment are dealt with in the 'Electrical Diagnostic Manual' (EDM) but may be mentioned here for reference.
10.4.2 Preliminary Action
Before any problem solving is undertaken it is essential that the fluid level and where applicable, belt tension, is
checked and if required corrected.
CAUTION: It is imperative that the power steering system does not become contaminated in any way. Always de cant fluid from a fresh sealed container and clean the area around the reservoir neck both before and after
topping-up. Never return drained fluid to the system.
10.4.2 Diagnostic Chart 1
Remedy
Rectify fluid loss and or top up
Re
-tension belt
Renew pump
Set to specification
Secure connection and bleed air out
Renew pump
Renew pump
Renew reservoir
Renew rack
Renew rack
Set to specification
Renew upper column
Renew rack
Retension belt
Reset idle speed
Renew
pump
Secure connection and bleed air out
Renew
pump
Renew pump
Rectify
fluid loss and or top up
Set to specification
Secure connection and bleed air out
Test and renew faulty joint
Renew rack
Check geometry and rectify
if required
Set to specification
Rectify fluid
loss and or top up
Secure connection and bleed air out
Renew pump
Renew rack
Renew rack
Tighten to specification
Renew rack
Renew rack
Check and rectify as required
Trouble
Heavy on both sides
Heavy on one side
Heavy when steering
rapidly
Vague feel about center
Knocking
1 vibration felt
at steering wheel
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Issue 1 August 1994 6 X300 VSM

@ Steering
. Pack the annular gaps of the oil seal lips with grease.
. Bearing. Wash the hub assembly thoroughly and 'drift' the affected bearing cup(s) from the hub.
!&!$Q:
rn Hub. At this point the hub may be renewed if required.
Assembly
. Bearing. Assemble the inner bearing track to the hub using service tool 18G 134 and adaptor JD 550 - 5 / 1.
Ensure that the hub inner seal diameter is free of debris or damage and is lightly lubricated prior to assembly.
Only replace complete bearings, never cup or race in isolation.
Assemble the outer bearing cup to the hub using service tool
18G 134 and adaptor JD 550 - 5 / 2. Pack each race with approximately 4 ml of grease and position the inner race onto the stub axle.
Apply a smear of grease to hub inner surfaces and bearing cups. Assemble the hub to the stub axle followed by
outer race, bearing washer and hub nut.
It is not necessary to fill the hub cavity with grease, merely protect from corrosion with a coat of IubricanL'Seat'the bear-
ings by slightly tightening the hub nut whilst rotating the hub. Do not apply load without rotation. m:
. End float. Set a Dial Test Indicator (DTI) as shown in Fig. 1 and adjust the hub nut to achieve the correct end float.
As the adjustment is made, continually load the hub axial-
ly in both directions.
. Without disturbing the end float setting, fit the castellated
nut retainer so that it aligns with both hub nut and stub
axle drilling.
. Secure nut retainer using a new cotter pin.
9 Assembly and fitting is the reversal of this procedure not- ing that; all fixings MUST be tightened to specification
and operation of the braking system verified.
Fig. 1
Issue 1 August 1994 10 X300 VSM

Suspension Systems
11.1 INTRODUCTION
This section describes the front and rear suspension systems, and also covers diagnostic procedures.
Fig. 1 Front Suspension Layout
11.2 FRONT SUSPENSION, DESCRIPTION
Theupperrearwishbone(1 Fig.l)andthe upperfrontwishbone(2 Fig.1)arepivotedon the upperfulcrum bolt (3Fig.l), passing through the front cross beam assembly. They are also fitted via an upper ball joint assembly (4 Fig.1) to a verti- cal linkaccommodating the stub axle (5 Fig.l), whereas the vertical linkisfittedvia a lower ball joint assembly (6 Fig.1) to the lower wishbone assembly.
The lower wishbone assembly comprises
a lower rear wishbone (7 Fig.l), lower front wishbone (8 Fig.l), damper (9 Fig.1) (incorporating damper bush 10 Fig.1) and spring pan (1 1 Fig.1) supporting the road spring (12 Fig.1). The lower
wishbone assembly is pivoted on the bushed lower fulcrum shaft (13 Fig.1) which also passes through thecross beam
assembly.
Both independent front suspension assemblies are linked by a stabilizer bar (14 Fig.1) which is secured to the cross
member using a fixing arrangement of mounting rubbers (15 Fig.1, clamps (16 Fig.l), nuts bolts, washers (17 Fig.1) and two link arm assemblies (18 Fig.1). Each link arm assembly is fitted to one end of the stabilizer bar and to one end
of the lower front wishbone using a fixing arrangement of bolts washers and self locking nuts.
All suspension loads, except the damper, are fed into a pressed steel crossbeam which is isolated from the body by
rubber bushes. This mounting method allows the necessary amount of compliance.
The degree
of caster is adjustable via shims positioned on either side of the upper ball joint assembly but camber is facton/ set and is not adjustable. The vertical link and the steering arm form a single forging. Cast iron hubs rotate
on twin tapered roller bearings.
X300 VSM 1 Issue 1 August 1994

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

1. SERVICE TOOLS & EQUIPMENT
Description
Parking brake cable remover
Illustration
Notes
not
illustrated
Pipe connectors to hydraulic module:
M12
M10
Jaguar Number
JD.142
15
- 19
12 - 16
186.672
Description
U-
Molykote 11 1 Caliper to carrier securing bolts
6947017
Notes
JDS.9013
Replacer disc brake
piston seal
I
Brake hose clamp, Girling
Brake pedal hold down tool
11. TORQUE TIGHTENING SPECIFICATIONS
Fixing 1 Tightening Torque
(Nm)
Vacuum booster to pedal box I 21 -29 I
Tandem master cylinder to booster I 21 -29 I
Hvdraulic module to module bracket I 18 - 26 I
Caliper guide pins I 25 - 35 I
Caliper to vertical link I 120 - 160 I
Caliper to hub carrier I 54 - 66 I
111. SERVICE MATERIALS
Iv. SERVICE DATA
Front brake disc run out
Front brake
disc parallelism
Rear brake disc
run out
Rear brake disc parallelism 0.101
mm (0.004 in) max.
0.0127mm (0.0005in) max.
0.101
mm (0.004 in) max.
0.0127mm (0.0005in) max.
Issue 1 August 1994 ii X300 VSM