1998 JAGUAR X308 cooling

12. Remove the undertray. Re fer to Operation 76.22.90.

13. Remove the two bolts which se cure the generator cooling
duct to the oil pan body and remove the duct.
14. Remove the front cross member for access. Refer to
Operation 76.10.05.

15. Drain the engine oil.
1. Position the waste oil bowser.
2. Remove the drain plug from the oil pan and drain the engine oil.
Fit a new sealing washer to the drain plug.
Wipe the drain plug and install it to the oil pan to prevent
oil dripping.
Move the oil bowser away from the vehicle.

16. Remove the oil pan.
1. Remove the eighteen bolt s which secure the oil pan
to the oil pan body.
2. Remove the oil pan.
3. Remove the gasket from the oil pan body assembly.

17. Disconnect the oil cooler pipes.
1. Remove the bolt which secures the oil cooler pipes.
2. Disconnect the oil cooler pipes from the oil pan body
assembly.
3. Remove and discard the O-ring seals from the pipes
and install blanking plugs to the pipes and unions.
18. NOTE: Place a suitable container underneath filter to prevent
oil spillage.

Install and tighten the lower securing bolts to 18-24 Nm.
Tighten the upper securing bolts to 18-24 Nm.

16. Position the transmission cooler pipes and the clamping
bracket. Install the bolt to secu re the clamp and tighten to 7-9
Nm.

17. Connect the oil cooler pipes to the oil pan body assembly
(vehicles with engine oil cooler).
1. Remove the blanking plugs and install new O-ring seals.
2. Connect the oil cooler pipes.
3. Install the clamp and bolt which secures the oil cooler pipes. Tighten to 18-24 Nm.
18. Install the front cr ossmember. Refer to Operation 76.10.05.

19. Position the generator cooling duct to the oil pan body and
install the two bolts.
20. Install the undert ray. Refer to Operation 76.22.90.
21. Install both front wheel and tyre assemblies. Refer to
Operation 74.20.05.
22. Install the timing cover and al l associated components, as
detailed in Operation 12.65.01. Do not refill the cooling system
at this stage.

23.
Install the supercharger driv e belt tensioner. Refer to
Operation 18.50.24.

24. Install the supercharger idle r pulley mounting bracket.
1. Position the mounting bracket to the timing cover.
2. Install the three bolts which secure the mounting bracket. Tighten to 8-10 Nm.
25. Install the supercharger drive belt idler pulley. Refer to
Operation 18.50.09. (34-46 Nm).
26. Install the supercharger driv e belt. Refer to Operation
18.50.08.
27. Install the coolant outlet pipe. Refer to Operation 26.31.08.
28. Install the twin fan and motor assembly. Refer to Operation
26.25.12.
29. Refill the cooling system. Refer to Operation 26.10.01 in
General Procedures section of the cooling system.
30. NOTE: When the engine is star ted from cold and run for a
short period only, before being swit ched off, a quantity of oil will
be 'hung up' within the engine because it is not up to operating
temperature.
Should the oil level subsequently be topped-up, the level could
become too high, causing oil burning.
Typically, 0.875 L is hung up.
Refill the engine with the correct specification engine oil.
31. Connect the battery and in stall the battery cover.
Refer to the Battery Reconnection Procedure 86.15.15.
32. Check the oil level and start th e engine. Check for leaks and
that the engine runs correctly.
33. Install the engine compartmen t cover. Refer to Operation
76.16.01.
34. Remove the paintwork protection sheets and close the engine
compartment cover.

• WARNINGS:


4. Remove the engine compartment cover (bonnet).
1. Apply masking tape to th e front edge of the engine
compartment cover to protect the paintwork during
removal and storage.
2. With assistance, support the cover and release the
gas struts.

5. With assistance, release the six bolts which retain the cover
(bonnet) and lift the cover clear.
Disconnect the ground cable from the left hand hinge.

6. Remove the engine covers
7. Drain the cooling system. Refer to Operation 26.10.01.
Conserve as much of the coolant as possible to refill the
system.
8. Depressurise the air conditioni ng system. Refer to Operation
82.30.30 and note all Wa rnings and Cautions.

to th
e throttle body.

51 . Co
nnect the intake tube to the throttle body.
1. Fit a new seal and connect the intake tube to the throttle body.
2. Fit the two bolts which secure the intake tube to the throttle body.

52 . Conne
ct the air cleaner cover.
F
it
the five clips which secu
re the air cleaner cover.

53 . Re
connect the breather pipe to the A-Bank camshaft cover.
1. Fit a new O-ring seal to the breather pipe.
2. Connect the breather pipe to the stub pipe.
54. Connect the air flow meter connector.
55. Fit a new Ty-strap to secures the vacuum pipe to the
induction elbow.
56. Refill the cooling system. Refer to Operation 26.10.01.
57. NOTE: When the engine is star ted from cold and run for a
short period only, before being swit ched off, a quantity of oil will

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

The cooling
pack incorporates the radiator a
ssembly with integral transmission oil cool er (located in the radiator outlet tank),
an air conditioning condenser, and the cooling fans and cowl assembly.
The cooling pack on supercharged vehicles is the same as described above, but with the addition of a charge air cooler
coolant radiator located in front of the condenser.
Radiator Mounti
ng/Retention
T
he radiator is mounted on four rubber mounts, one on each
end of the upper and lower horizontal face. The two lower
mountings are supported on two isolated brackets mounted on the body; the lower cradle assembly has subsequently been
deleted.
A closing panel made from polypropylene, which retains the radiat or assembly, fits over the top of the radiator and is bolted
to the vehicle top panel.
Coolant Hoses - Engine