water pump JAGUAR X308 1998 2.G User Guide

4. Refit the timing cover, step 2.
Standing at the right hand side of the vehicle, rotate and
manoeuvre the cover downwards to clear the water pump
and hoses.

5. Refit the timing cover, step 3.
Ease the cover towards the engi ne and locate it directly
onto the dowels so that th e gaskets or sealant are not
smeared.
6. Fit and tighten the securing bolt s in the correct order. Tighten
to 11-13 Nm.

13. Reconnect the air cleaner cover.
Fit the five clips which secu re the air cleaner cover.

14. Connect the intake tube to the throttle body.
1. Connect the intake tube to the throttle body.
2. Fit the two bolts which secure the intake tube to the throttle body.
15. Reconnect the air flow meter multi-plug.
16. Refit the engine covers.
17. Refit the crankshaft damper. Refer to Operation 12.21.09.
18. Refit the idler pulley, to the Front Accessory Drive. Refer to
Operation 12.10.43.
19. Refit the belt tensioner assembly, to the Front Accessory
Drive. Refer to Operation 12.10.41.

20. Refit the pulley to the water pump.
1. Refit the pulley to the water pump.
2. Fit the pulley securing screws. Tighten as far as
possible; then to the correct torque after the belt has
been fitted.

21
.
Refit the drive belt to the generator and accessory drive.
Locat
e the belt around the pulleys, except the generator
pulley.
1. Use a spanner e.g. Churchill JD - 230 or Snap On XDHM 1415, on the centre bo lt of the belt tensioner
idler pulley, to turn the adju ster assembly to the left
against spring tension.
2. Whilst holding the tensioner against spring tension, connect the drive belt to the generator pulley.
Release the tensioner sl owly and remove the
spanner.

22
.
Tighten the three screws wh ich secure the water pump
pulley, to 10-14 Nm.

23
.
Connect the top hose to the coolant outlet pipe.
1. Connect the top hose. Reposition the hose clip and tighten.

24
.
Connect the radiator top hose.
1. Connect the hose to the radiator.
2. Reposition the clip along the hose and tighten the clip.
25. Reset the bonnet to the normal position and connect the gas
struts.
26. Connect the battery and fit the battery cover.
Re
fer to the Battery Reconnection Procedure 86.15.15.
27. Refill the cooling system. Refer to Operation 26.10.01.


28

.
Remove the paintwork protection sheets and close the engine
compartment.

Engine Cooling
- Engine Cooling
Descr
i
ption and Operation
Engine Cooling Comp onents - Normally Aspirated Vehicles

Engine cooling is via a low volume, high velocity system which achieves a very fast warm up. The temperature of the
combustion chambers is reduced along with a more even temperature distribution. The temperature of the bores is increased.

F r
om the pump, coolant flows into each bank of the cylinder bl
ock. In each bank, approximately 50% of the coolant cools the
cylinder bores and the remainder is diverted th rough the bypass gallery to the cylinder head.
With the thermostat closed, coolant returns directly to the pump through the bypass on the thermostat housing.
With the thermostat open, coolant returns to the pump via the radiator.
The cooling system uses a mixture of water and Jaguar Anti-Freeze/Inhibitor (Dow 542).
The cooling system on a supercharged engine is similar, but has additional components for cooling the intake air.
Engine Cooling Co mponents - Supercharged Vehicles
ItemDescrip
tion
1Thr
ottle B
ody
2Hea
ter Return
3Coolant Pum p
4Ther
mostat Housing
5Vehicle Radia
t
or
6Hea
ter Su
pply
7Bleed
Outl
et (to expansion tank)
8EGR V
a
lve (when fitted)
9Bleed
Outl
et (to expansion tank)

T
he cooling system for the supercharged engine is very similar
to the normally aspirated engine, but with the addition of a
water cooled, intake air charge cooling system. This comprises a radiator, an electrically operated water pump and two
charge air cooler assemblies (heat exchangers) - one for each bank. The system works independently, but is connected to the
main cooling system at the bottom hose to allow for therma l expansion and to help to prevent unwanted circulation.
The condenser for the air conditioning system fits between th e coolant main radiator and the charge air cooling system
radiator.
Cylinder Block Heater, Drain Location
ItemDe
scription
1Rad

iator - Intake Air Coolant
2Ele

ctrically Operated Coolant Pump
3Top Hose
4Charge Air Coo

lers -
Intake Air Cooling
5Fi
lling Point for Intake Air Cooling
6N

on-Return Valves - Heater
7Ele

ctrically Operated Coolant Pump
8Hea

ter Matrix
9Wate

r Valve - Heater Control
10EGR V

alve (when fitted)
11Thr

ottle Body
12Coolan

t Recovery Bottle
13H

eader/Expansion Tank
14Eng

ine Coolant Pump
15The

rmostat Housing
16Bottom

Hose
17Air Bleed

Pipes
18Rad

iator - Main Cooling System

A coola
nt outlet plastic pipe connects to the outlet port of ea
ch cylinder head to provide a common connection point for the
radiator top hose. It also incorporates the Engine Coolant Te mperature (ECT) sensor which provides a signal representing
coolant temperature at the cylinder heads. The outlet pipe has connections to supply the heater matrix and the bypass flow
to the thermostat housing. An in-groove ga sket, seals each of the outlet-to-cylinder head joints. An aluminium gasket seals
the ECT sensor to duct joint.
Coolant Outlet Duct - Supercharged

The coolant outlet duct on the supercharged engine performs exactly the same function as on the normally aspirated engine
and connects to the same ports on the engine. The main physical difference is that the thermostat housing has been
ItemDe
scription
1Bottom

Hose Connection
2The

rmostat Cover
3The

rmostat
4Coolan

t Outlet Duct
5B

reather Connection
6ECT Se

nsor
7Top Hose Conn

ection
8Bypa

ss to Water Pump
9Hea

ter Hose Connection

combin
ed with the outlet duct and consequently, there is no separate housin
g assembly fitted above the water pump, as used
on the normally aspirated engine. The illustration shows the outlet duct viewed from the engine.
Thermostat Housing

The plastic housing for the thermostat is fitted between th e two cylinder banks immediately above the coolant pump.
Controlling the coolant flow through the radiator, the thermostat starts to open at 80 ° to 84 °C and is fully open at 96 °C.
A duct in the cylinder block connects the thermostat housing outlet to the coolant pump inlet. The joint between the
thermostat housing and the cylinder block is via an in-groove seal.
An air bleed outlet vents an y air in the system into the expansion reservoir, durin
g normal operation. A removable cap (usin g
a hex key) allows air to vent from the system when filling from empty.
On supercharged engines, the thermostat housin g is combined with the coolant outlet duct.
Radiator

• NOTE
: To ensure that
air is not drawn into the system during the following operations:
Do
not remove the cap from the header tank whilst the
charge air cooling system is open to atmosphere.
Do
not switch on the ignition when th
e charge air cooling system is open to atmosphere because the electrical
cooling pump may draw air into the system.
2. Fi
ll the cooling system at the header tank until the
level stabilises near the to p of the charge air cooler
fill point. This will take some time, as air is being
purged from the system.
Ensure that the head
er tank is full.
2. Fit the pressure cap to the header tank.

3. Pour coolant careful l
y into the charge air cooler fill point until
the system is full.
Fi t t
he plug and washer to the fill point.
4. Remove the pressure cap from the header tank.
5. Switch on the ignition and switch off the climate control
system.
Le ave
the ignition switched on (do not start the engine)
for at least 2 minutes to allow the air charge cooler
electric water pump to oper ate and to purge any air from
the air charge cooler radiator to the header tank. (This
operation will be repeated later)
6. Switch off the ignition for at least 1 minute.
7. Leave the ignition switched on (do not start the engine) for at
least 2 minutes to allow the air charge cooler electric water
pump to operate and to purg e any air from the air charge
cooler radiator to the header tank.
8. Top up the cooling system.
1. Top up the header tank and fit the pressure cap.
2. Remove the plug from the air charge cooler fill point. Pour coolant carefully into the air charge cooler fill
point until the system is full.
3. Fit the plug and washer to the fill point.

All vehicles


21.
N
OTE: Install a new sealing washer.
• NOTE: Clean off any spillages.
Install the supercharger coolant fill plug.
Tighte
n to 45 Nm.
22. Remove the coolant expans ion tank pressure cap.
23. Switch ignition on.
24. CAUTION: Do not allow the supercharger water pump to
run dry. Failure to follow this instruction may result in damage to
the vehicle.
• NOTE: Leave the ignition switched on (do not start the engine)
for at least 2 minutes to allow the air charge cooler electric water
pump to operate and to purge an y air from the air charge cooler
radiator to the header tank.
Allow the supercharger pump to run and top up the system
through the coolant expansion tank.
25 . Swit
ch the ignition off.
26. Install the coolant expansion tank pressure cap.
27. START and RUN the engine.
28. CAUTION: Observe the engine temperature gauge. If
the engine starts to over-heat switch off immediately and allow to
cool. Failure to follow this inst ruction may cause damage to the
vehicle.
Run the engine at between 1500 and 2000 rpm until the cooling
fan operates.
29 .
Swi
tch off the engine.
30. Allow the engine to cool.
31. Check and top-up the coolant if required.

Engine Cooling - Water Pump4.0L NA V8 - AJ27/ 3.2L NA V8 - AJ26
Re
moval and Installation
Remov

al
1.
O
pen the engine compartment and fit paintwork protection
sheets.
2. Drain the cooling system.
For additional information, refer to Cooling System Draining,
Fillin
g and Bleeding
- Vehicles W
ithout: Supercharger
in
this
section.

3. Sl
acken the three screws which
secure the water pump pulley.

4. CAUTI
ON: When releasing the
belt tension, never apply
any torque in a clockwise direction to the pulley ce ntre bolt (left
hand thread) as it could subsequently loosen.
Remove the drive belt from the generator and accessory drive.
1. Use a spanner e.g. Churchill JD-230 or Snap On XDHM 1415, on the centre bo lt of the belt tensioner
idler pulley, to turn the adju ster assembly to the left
against spring tension.
2. Whilst holding the tensioner against spring tension, remove the drive belt from the generator pulley.
Release the tensioner sl owly and remove the
spanner.
D
isconnect the belt from the ot
her pulleys, as necessary,
to move it clear of the pump pulley.

5. Re
move the pulley from the water pump.
1. Remove the pulley securing screws.
2. Remove the pulley from the water pump.
6. Remove the water pump.
1. Remove the five bolts wh ich secure the water pump.