1994 JAGUAR XJ6 water pump

Lower radiator cradle to body
Radiator drain plug
1,5-2,5
Radiator temperature switch 13-17
Receiver drier to cooling fan assembly
Top radiator panel to body 7
-1 0
2,5-3,5
7-10
111. SERVICE
MATERIALS
Description USeS Notes
I to be issued I I I
0
SERVICE TOOLS & EQUIPMENT
No Jaguar service tools are required for working on the cooling system. Some normal workshop items will be required,
including a pressure tester, hydrometer and thermometer.
TORQUE TIGHTEN/ NG SPECI FICA TIONS
Fixing Tightening Torque
(Nm)
Electric fan assembly to body
Header tank bracket to body 7-10
7-10
Header tank to body
2,5-3,5
Hose clip, bleed hoses except those shown below 13-2.5
Hose clip, all main hoses 2,5-3,5
Hose clip, bleed hoses to header tank
Locator, fan cowl to radiator top panel 2.5-3,5
8,5-11,5
0
0
/U SERVICE
DATA
I Application
I Engine thermostat temperature rating
I Coolant header cap pressure rating
Water
pump / air injection pump drive belt tension
Drive belt tension measuring point
Specification I
88OC I
1.2 bar
Burroughs method: new belt 650
N. In service, if
tension falls below 320 N reset at 400 N
Clavis method: new belt 169 to 175 Hz. In service, if
tension falls below 127 Hz reset at 132 to 138 Hz.
Mid
-way between crankshaft and air injection pump
pulleys
X300 VSM Issue 1 August 1994 ii

Cooling System (V12
4.2.1 COOLING SYSTEM DESCRIPTION I
4.2.1.1 Major Components
o Engine crossflow radiator, incorporating a concentric tube cooler for the power steering fluid mounted in the
left
-hand radiator side tank. Vehicles with automatic transmission have a six-plate transmission fluid cooler
mounted in the right
-hand radiator side tank. A double-action temperature switch, for controlling the electric
radiator cooling fans, is mounted in the left
-hand radiator side tank.
0 Engine driven, viscous-coupled, radiator cooling fan
0 Two electrically operated radiator cooling fans, mounted in front of the radiator.
o Coolant circulating pump, belt driven from the engine crankshaft.
0 Coolant header tank with pressure relief cap and coolant level probe.
0 Two engine thermostats, one in each cylinder bank.
4.2.1.2
0 Heater matrix.
0 Electrically operated coolant circulating pump, mounted on the left-hand side of the engine bulkhead.
o Solenoid operated valve, located adjacent to the coolant circulating pump.
Components for Climate Control System
1
4.2.1.3 Operation
The configuration of the cooling system is shown in Sub-section 4.2.2.
The cooling system is pressurized, which allows the system to operate at a higher temperature without overheating.
The header tank is fitted with a pressure relief cap to protect the system against overpressure.
Under cold start conditions, coolant is forced by the engine driven water pump through each cylinder block and cylin
- der head to the thermostat housings. The thermostats are closed to give rapid engine warm up, hence the coolant is
returned via the engine cross pipe to the water pump inlet. When normal engine operating temperature is reached,
the thermostats open and coolant is diverted through the radiator before returning to the water pump inlet.
If the engine driven fan is unable to provide sufficient cooling, the electrically operated fans operate in series and paral
-
lel underthe control of the radiator mounted temperature switch. Under hot operating conditions, the electric fans may
continue to operate after the engine has been switched off. The fans stop automatically when the coolant temperature
has been reduced sufficiently.
The system also provides the coolant supply for the climate control system, which is described in Section 14.
I
I X300 VSM 1 Issue 1 August 1994

Cooling System (VI 2)
0
4.2.2 COOLING SYSTEM CONFIGURATION
Theconfigurationofthecooling system isshown in Fig. 1. Themaincoolantflows,withthesystem at normaloperating
temperature (i.e. with the engine thermostats open), are indicated
by arrows.
6 rr
1
2
1. Header Tank 3. Water Pump 5. Engine 7. Heater Pump
2. Radiator 4. Thermostat 6. Heater 8. Heater Valve
Fig.
1 Cooling System Layout
Issue 1 August 1994 2 X300 VSM

WARNING: DO NOT REMOVE THE HEADER TANK PRESSURE CAP WHILE THE ENGINE IS HOT. IF THE CAP MUST
BE REMOVED, PROTECT THE HANDS AGAINST ESCAPING STEAM AND SLOWLY TURN THE CAP ANTI- CLOCKWISE UNTIL THE EXCESS PRESSURE CAN ESCAPE. LEAVE THE CAP IN THIS POSITION UNTIL
ALL THE STEAM AND PRESSURE HAS ESCAPED AND THEN REMOVE THE CAP COMPLETELY.
WARNING: WHEN DRAINING THE COOLANT WITH THE ENGINE HOT, PROTECT THE HANDS AGAINST CONTACT
WITH HOT COOLANT.
WARNING
: WHEN WORKING WITHIN THE ENGINE COMPARTMENT, KEEP CLEAR OF THE ENGINE DRIVEN RADI- ATOR COOLING FAN WHEN THE ENGINE IS RUNNING.
4.2.3.2 Working Practices
Whenfilling thesystem with coolant,ensurethatthevehicle isstanding on a level surfaceand thatthecoolant is poured
in slowly so that airlocks are not introduced into the system. Airlocks can seriously affect the operation of the climate
control system and can cause damage to the heater circuit pump.
Hose clips should always be positioned
so that there is proper access for tightening and that the clip does not foul or
interfere with the operation of any components.
4.2.3 SERVICE PROCEDURES
4.2.3.1 Safety Precautions
The anti-freeze specified in Appendix A1 must be used wherever possible. It is designed to afford the maximum cor- rosion protection to all metals found in the engine cooling system, as well as having the frost protection properties
necessary during the winter months. Should it not be available, then anti-freeze conforming to Ford Motor Company
specification
ESBM97B49-A may be used. To provide optimum temperature and corrosion protection, the specified
anti-freeze concentration must always be used. Once coolant has been drained from the system, it must be discarded
and not reused. Anti-freeze is harmful to the environment. Always dispose of used coolant safely and never pour it down a drain connected to the public sewer.
CAUTION: Never fill or topup the system with water only.
CAUTION
: Anti-freeze is harmful to paintwork. Coolant spillages must be wiped up immediately and the affected
area washed to remove all traces of coolant.
CAUTION: To prevent the possibility of damage to the heater circuit
pump, the pump should be electrically isolated if the ignition has to be turned ON while the cooling system is drained.
The drive belt must always be tensioned to the specified value and the tension checked at the correct point on the belt.
This information is given in Sub-section IV in the preliminary pages.
When tightening components, the torque figures given in Sub
-section II in the preliminary pages should always be
used for the fastenings listed.
When fitting a replacement thermostat, ensure that the jiggle-pin is to the top of the thermostat housing.
4.2.3.3 Coolant Change
The coolant must be changed at intervals of four years. The system should be drained from the radiator drain plug,
flushed and filled with fresh coolant. Flushing should be carried out thoroughly to remove all the old coolant from the
engine and heater matrix. (The heatervalve isopen with the ignition OFF). AfterfilIing,checkthecoolant concentration
with a hydrometer. For specified anti-freeze and coolant concentration, see in Appendix Al.
X300 VSM 3 Issue 1 August 1994

4.2.5.2 Diagnostic Procedures
1
I Symptom ..
Overheating
herheating at
dle
roo cold ~~~
Possible Cause
Thermostat(s) stuck
closed
Incorrect thermostat rating
Faulty temperature gauge
Faulty temperature transmitter
Radiator core blocked
Radiator grille obstructed
Concentration of anti
-freeze
too high
Drive belt slack
Drive belt broken
Water pump seized
lnsuff icient coolant
Internally collapsed hoses
Incorrect ignition timing
Fuel
/ air mixture too weak
Incorrect valve timing
Cylinder head
gasket(s) leak-
ing
Brakes binding
Electric cooling
fan(s) not op- erating
Thermostat(s) stuck open
Incorrect thermostat rating
Thermostatb) not fitted
Electric cooling
fan(s) operat-
ing continuously
Faulty temperature gauge
Faulty temperature transmitter
Check
Cooling System (V12)
4.2.5 FAULT DIAGNOSIS
4.2.5.1 Introduction
The following diagnostic procedures are provided to assist properly qualified persons to identify and rectify the faults in the system which are most likely to be encountered. Reference is made to the Electrical Diagnostic Manual (EDM), which should be consulted for all electrical faults. When investigating faults relating to temperature, the prevailing
ambient temperature conditions should be taken into account. The climate control system is dealt with in Section 14.
Test thermostat(s)
Check thermostat operating
temperature
Refer to EDM
Refer to EDM
Check for
hotspots in radiator
Check grille for obstruction
Check strength of coolant
Check belt tension
Visual check Slacken drive belt and turn
water pump pulley by hand.
Check belt for damage
Check coolant level
Pressure test system and
check for deformation of hoses
Refer to EDM
Refer to EDM
Check valve timing
Pressure
-test system. (Check
for contamination of coolant in
header tank)
Check brake calipers for stick
- ing pistons and seized brake
pad pins
..
Refer to EDM
Test
thermostat(4
Check thermostat operating
temperature
Remove thermostat housing
and inspect
Refer to EDM
Refer to EDM
Refer to EDM
Remedy
Renew thermostat(s)
Renew thermostat(s1
Renew gauge
Renew transmitter
Flush or renew radiator
Remove obstruction from
grille
Drain and
fill with coolant of
correct concentration
Adjust belt to correct tension
or renew belt
if worn
Renew belt
Renew water pump. Renew
drive belt
if required
Top
-up coolant
Renew hoses as required
Rectify as required
Rectify as required
Correct valve timing
Renew head
gasket(s)
Rectify as required
Rectify as required
Renew
thermostat(s1
Renew thermostatb)
Fit thermostat(s)
Rectify as required
Renew gauge
Renew transmitter
Issue 1 August 1994 X300 VSM 5

rn Cooling System (VI 2)
Diagnostic Procedures (continued)
Symptom
-0ss of cool-
ant
Possible Cause
Loose clips on hoses
Hoses perished
Radiator core leaking
Water pump seal leaking
Thermostat
gasket(s) leaking
Header tank cap defective
Porosity in castings
Corrosion caused by con
- centration of anti-freeze being
too low
Cylinder head
gasket(4 leak- ing
Cracked or damaged internal
engine component
Check
Check clips for correct tight-
ness
Visual check
Pressure
-test system
Pressure
-test system
Pressure
-test system. (Check
for distortion of thermostat
housing(s))
Inspect cap or test cap spring
pressure
Pressure
-test system
Pressure
-test system. Check
strength of coolant
Pressure
-test system. Check
for contamination of coolant
and engine lubrication system
Identify
component(s) affected. (Check for
contamination of engine
lubrication system)
Remedy
Tighten clips as required
Renew hoses as required
Repair or renew radiator
Renew water pump
Renew gasket. Renew
hous-
ing(s) if required
Renew cap Rectify as required
Rectify as required. Drain and
fill with coolant of correct con
-
centration
Renew head
gasket(s)
Rectify as required
Issue 1 August 1994 6 X300 VSM

@ 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

Climate Control Systems
Description U-
HFC 134A - ICI Klea or
equivalent
Polyalkyleneglycol (PAG) Compressor lubricant
Refrigerant
111.
Notes
Recyclable. NOT
compatible
with CFC 12
Absorbs water readily. NOT
compatible with mineral based
oils
SERVICE MATERIALS
Standard for Recovery I Recycle 1 Recharge Equipment.
Recovery rate
Cleaning capability
Oil separator
.Moisture indicator
Vacuum pump
Filter Replaceable with moisture indicator
Charge Hoses
Feature Requirement
0,014 - 0,062 m3 / min. (1,36 kg in 20 minutes)
15 parts per million (ppm) moisture; 4000 ppm oil; 330 ppm non condensable gases
in air
With hermetic compressor and automatic oil return
Sight glass type, sensitive to 15 ppm minimum
2 stage 0,07 - 0,127 m3 I min.
Selectable charge weight and automatic delivery
Dedicated HFC 134A port connections.
Iv. SERVICE DATA
Application
Charae weight
Lubricant capacity
Compressor pressure relief valve
Drive belt 12 cylinder
Drive belt tension
All figures apply to a cold belt
Special note
Drive belt tension measuring point
Drive belt 6 cyclinder
Drive belt tension
All figures apply to a cold belt
Drive belt tension measuring point
Specification
160 - 200 ml
Opening point 34 Bar. Closing point 27,6 Bar.
Maximum leakage rate of 113 liters 1 minute @ 41 Bar
7 rib Poly
-vee; 1450 mm long
Burroughs method
- New belt 790 N; If tension falls
below 270 N reset at 630 N
Clavis method
- New belt 114 to 120 Hz; If tension falls
below 70 Hz reset at 87 to 93 Hz
For new belt; rotate engine 3 revolutions minimum and
retension
Mid-way between crankshaft and compressor pulley ~
4
rib Poly-vee X 1010 mm long
Burroughs method
- New belt 556 to 578 N; If tension
falls below 245 N reset at 378 to 400
N
Clavis method - New belt 167 to 173 Hz; If tension falls
below 85 Hz reset at 127 to 133 Hz
Mid
-way between crankshaft and compressor pulley on
the upper run
1 Charge pressure I Heating element to increase pressure
Issue 1 August 1994 X300 VSM iii