1994 JAGUAR XJ6 coolant reservoir

(if applicable) term(s) (or Eng- lish Equivalent)
I R
Radio Data System
Random Access Memory
I rear wheel drive
relay
relay module
reservoir
return
revolutions per minute
right
-hand
right
-hand drive vehicle
I rocker panel
I roof lining
RDS
RAM
ROM RWD
RM
RES
RTN
RPM
RH
RHD
local traffic information service which
automatically breaks
in to whichever station
is being received. Also programmable to
lock onto the strongest available frequency
for a given nationally available radio station,
regardless ofthe geographical location of the
receiver
fast access memory store which is accessible
for entry or extraction of data
fast access memory
in which data is fixed and
mav not be entered or extracted
an (usually) electro
-mechanical device in which connections in one circuit are opened
or closed by changes
in another circuit
a module containing two or more relays
container, usually for oils, coolants or
hydraulic fluids
a dedicated sensor ground circuit
shaft
-speed of a device, usually an engine or
motor
I
X300 VSM Issue 1 August 1994 22

@ Steering
10.1.3 Steering Hydraulic System Major Components
Engine driven rotary vane pump (belt driven 12 cylinder; direct drive from timing gear 6 cylinder) with falling
flow characteristic (as
pump speed increases fluid flow decreases) and integral pressure relief valve.
Remote fluid reservoir with integral 'return' side filter.
Steering rack (incorporating speed sensitive transducer).
Steering control module
(SCM).
Fluid cooler integral with engine coolant radiator and associated pipe-work.
10.1.4 Hydraulic System Features
The 'Servotronic' system reduces steering input loads during parking and low speed manoeuvres and progressively
increases input loads as vehicle speed rises. This feature enhances steering feel.
10.1.5
Rotary motion of the steering wheel is converted, via the steering gear pinion to lateral motion of the rack. Hydraulic
assistance is provided by pressurized fluid being directed against the rack bar piston in the rack cylinder. The pressure
applied to each side of the rack piston is controlled by the pinion valve which varies the restriction through which the
flow for each side of the rack piston must pass.
Hydraulic System Operating Principle (see illustrations on next three pages)
Section on X X
J57-277
A. Steering rack F. Torsion bar 0 Radial groove B. Driving pinion G. Oil pump 1 Speedometer
C. Power cylinder H Pressure & flow 2 SCM D. Rotary disc valve limiting valve 3 Transducer
E. Control sleeve N Radial groove
Fig.
1 Major components & hydraulic flow - Neutral position ~
Issue 1 August 1994 X300 VSM 2

@ Steering
10.4.4 Diagnostic chart 3
Trouble
Hydraulic noise when
turning lock to lock
Continuous pressure
relief valve operation
Continuous noise
Cause
Fluid level low?
Air ingress at connections
Air ingress through feed hose lining
or
skin
Air ingress at pump front seal
Water contamination caused by fractured
cooler pipe within engine coolant radi
-
ator
Pump starvation or cavitation caused by
twisted or trapped feed hose
Pump starvation caused by blocked filter
Worn
pump
High pressure hose (pump to rack) dam-
aged or restricted
Fluid level low?
Drive belt loose
(12 cyl only)
Drive pulley loose
Steering pump mounting
(4 loose
Drive 'dog' loose, slipping or incorrectly
fitted
(6 cyl only)-
Hose or pipe fretting on body or chassis
structure
Hose twisted or restricted
Remedy
Rectify fluid loss and or top up
Check and tighten all connections to spec
-
ification
Renew faulty
'0' rings or Dowty washers
Renew porous
1 damaged hoses
Renew
pump
Renew radiator. Flush and drain steering
system twice
minimum, check for noise
and system performance (Pump is most
susceptible to damage due to
loss of lu-
brication and may have to be renewed)
Reroute or relieve pressure
Renew reservoir
Renew pump
Renew hose
Rectify
fluid loss and or top up
Inspect for damage and renew as required
Tighten pulley to specification
Tighten to specification
Investigate
& rectify as required
Rectify routing
Rectify routing
Issue 1 August 1994 8 X300 VSM

Routine
e
0
0
0
-
1. Engine oil - refill 2. Engine oil - drain
3. Transmission fluid - refill 4. Transmission fluid -drain 5. Brake fluid - refill 6. Engine coolant - refill 7. Clutch fluid - refill
J 10-054
8. 9.
10. PAS fluid
- refill
11. Windshield wash reservoir - refill
12. Axle shaft UJs - grease
13. Door check-arm - grease
Final
drive oil
- refill
Final drive oil - drain
Fig. 1 Fluids and Lubricants Service Points
- 6 Cylinder Vehicles
Issue 1 August 1994 A2-95MY 1 X300 VSM

2 4 11 87
* * Rout ine Maintenance
- X300 VSM
1. Engine oil - refill
2. Engine oil - drain 3. Transmission fluid - refill
4. Transmission fluid - drain 5. Brake fluid - refill 6. Engine coolant - refill
J10-055
7. 8. 9.. PAS fluid - refill
10.. Windshield wash reservoir
- refill 11. Axle shaft UJs - grease
12. Door check-arm - grease
Final drive
oil
- refill
Final drive oil - drain
Fig.
1 Fluids and Lubricants Service Points - 12 Cylinder Vehicles