valve JAGUAR X308 1998 2.G Workshop Manual

the
intake elbow provide connections for vacuum actuators and are also used to redirect emissions into the engine.
On the right-hand side of the elbow a la rge diameter pipe connects to the brake servo. The smaller pipe provides a vacuum
feed to the fuel rail pressure regulator and throttle cruise control system. On the le ft-hand side of the elbow the front pipe
supplies vacuum control for the evaporative emissions system valves.
Emissions from the engine part load breather (bank 2) and pu rged fuel vapor from the EVAP valve are drawn via a common
T piece into the left-hand side of the intake elbow. Re-cir culated exhaust gas enters the intake elbow via the EGR valve
which is mounted directly on the rear of the elbow : where the EGR system is not used, a blanking plate is fitted.
The fuel system, throttle and emission control system s are described more fully in the relevant sections.
Intake Manifold

Filtered air from the vehicle's intake ducting is metered by th e electronic throttle and distributed to the two cylinder banks
via an integral intake manifold.
The intake manifold is manufactured in plastic with integral plastic fuel rails and metal-thread inserts; the very smooth
internal surfaces give excellent air flow.
Individual ducts lead off a central chamber to the inlet valves of each cylinder.
Silicon-rubber gaskets, loca ted in channels in the intake manifold, seal th e joints between the ducts and the cylinder heads.
Engine Ventilation

The e
ngine is ventilated through two brea
thers; a part-load breather and a full-load breather, one on each camshaft cover.
The outlet hose for the part-load breather is connected between the bank 2 camshaft cover and the intake elbow. The full-
load outlet hose is connected from the bank 1 camshaft cover to the intake duct between the MAF sensor assembly and the
throttle body.
Constructed in plastic, the hoses incorporate O-ring seal s and quick-release connectors; refer to Section 303-01.
I
ntake Air Distribution and Filtering - Supercharged Vehicles
Ai
r is supplied to the supercharger via an
intake cleaner/duct, throttle assembly and intake elbow which are similar to those
used for normally aspirated engines. The su percharger delivers pressurized air to two separate charge air cooler units, each
unit being mounted on the cy linder bank which it supplies. Pr essurized cooled air is fed from the charge air coolers directly
into each inlet port.

The intake elbow di
rects the metered airflow from the electronic throttle outlet (und
erside of the throttle body) into the
intake of the supercharger.
The supercharger by-pass valve assembly is bolted to the intake elbow. The butterfly valve inside the assembly is opened
by a diaphragm actuator operated by vacu um feed from the elbow. At closed or partially open throttle positions, the
butterfly valve opens, allowing th e airflow from the two charge air cooler inlets to be directed back to the supercharger inlet .
This action inhibits the supercharging e ffect and reduces engine torque to non supercharged levels. Progressive opening of
the throttle causes the by-pass valve to gradually close.
On the right-hand side of the elbow a la rge diameter pipe connects to the brake servo. On the left-hand side the smaller
pipe supplies vacuum control for the evaporative emissions system valves.
Emissions from the engine part load breather (bank 1) and pu rged fuel vapor from the EVAP valve are drawn via a common
T piece into the left-hand side of the intake elbow. Re-cir culated exhaust gas enters the intake elbow via the EGR valve
which is mounted directly on the rear of the elbow. Where the EGR system is not used, a blanking plate is fitted.
The fuel system and emission control systems are described more fully in the relevant sections.
Fuel Pressure Regula
tion and
Cruise Control Vacuum Feed
The inlet v
acuum feed fo
r the fuel rail pressure regula tor and the cruise control system is taken from the supercharger
outlet duct. The feed pipe is located below the large charge air cooler coolant filler plug.
Superchar
ger
and associated components
Inta
ke Elbow and Bypass

is at
tached to the three mounting bosses between the V of the cylinder block
has a fil

led for life inte
rnal lubrication system
is po
sitively aligned with the drive
belt by a doweled mounting bracket
C
harge Air Cooler System
Each cyl
inder bank is fitted with a charge air cooler unit wh
ich supplies pressurized air to the four cylinders via an adaptor
block. The inlet ports to the tw o charge air coolers are connected to the supercharger outlet by an inle t assembly consisting
of rubber ducts and clamp plates . An outlet stub at the rear of each charge air cooler unit provides the connection for the
by-pass valve airflow. The charge air coolers ar e water cooled via a radiator and coolant pump.
Charge Air Cooler Coolant System

Parts List
Each charge air cooler unit is a fin and tube air to liquid heat exchanger. The coolant circuit for the charge air coolers
consists of a pump, ra diator, connecting hoses and a bleed pipe.


It
em
Par
t Number
De
scription
1—Charge air cool

ers

2—Coo
lant hoses
3—Coo

lant pump
4—Radi

ator
5—Ble

ed pipe to main coolant circuit expansion tank
6—Charge air cooler to en

gine
coolant circuit connection
7—Coo
lant top up plug
Supercharger
The supe
rcharger:

Intake Air Distribution and Filtering - Charge Air Cooler LH
Remo
val and Installation
Remov
a
l
Installation
1. Disc onne
ct battery ground cable (IMPORTANT, see SRO
86.15.19 for further information).
2. Drain radiator coolant; refer to 26.10.01.
3. Remove air cleaner cover / intake assembly; refer to 19.10.30.
4. Remove throttle body; refer to 19.70.04.
5. Remove exhaust gas re-circulation valve (EGR) if installed;
refer to 17.45.01.
6. Remove throttle intake elbo w; refer to (SC) 19.70.28.
7. Remove supercharger outlet duct; refer to 18.50.16.
8. Remove coolant outlet pipe; refe r to operation (SC) 26.31.08.
9. Remove supercharger drive belt; refer to 18.50.08.
10. Remove supercharger; refer to operation 18.50.15.
11. Detach engine harness retaining clip from rear of charge air
cooler.

12. Di
sconnect hoses from charge air cooler.
Pla

ce absorbent cloth in appropriate position.
Di
sc
onnect hoses.

13 .
CAUTI
ON: Take care to avoi
d dropping any objects or
foreign matter into engine inle t duct with charge air cooler
removed.
Remove charge air cooler from the engine.
1. Remove eight bolts.
Remove charge air cooler.
2
. Discard gasket.
Cle
a
n all mating faces.
1.
Install ch
arge air
cooler to adaptor.
1. Install new gasket.
2. Install charge air cooler.

2.
Conne
ct hoses to charge air cooler.
Conne

ct hoses.
3. Install supercharger; refer to 18.50.15.
4. Install supercharger driv e belt; refer to 18.50.08.
5. Install engine coolant outlet pipe; refer to 26.31.08.
6. Install supercharger outlet du ct and new gasket; refer to
18.50.16.
7. Install throttle intake elbow; refer to 19.70.28.
8. Install exhaust gas re-circulation valve (EGR) if applicable;
refer to 17.45.01.
9. Install throttle body ; refer to 19.70.04.
10. Install air cleaner cover / intake assembly; re fer to 19.10.30.
11. Refill cooling system; refer to (SC) (26.10.01).
12. Reconnect battery ground cable (IMPORTANT, see SRO
86.15.15 for further information).

Intake Air Distribution and Filtering - Charge Air Cooler RH
Remo
val and Installation
Remov
a
l
Installation
1. Disc onne
ct battery ground cable (IMPORTANT, see SRO
86.15.19 for further information).
2. Drain radiator coolant; refer to 26.10.01.
3. Remove air cleaner cover / intake assembly; refer to 19.10.30.
4. Remove throttle body; refer to 19.70.04.
5. Remove exhaust gas re-circulation valve (EGR) if installed;
refer to 17.45.01.
6. Remove throttle intake elbo w; refer to (SC) 19.70.28.
7. Remove supercharger outlet duct; refer to 18.50.16.
8. Remove coolant outlet pipe; refe r to operation (SC) 26.31.08.
9. Remove supercharger drive belt; refer to 18.50.08.
10. Remove supercharger; refer to operation 18.50.15.
11. Remove intake air temperatur e sensor 2 from charge air
cooler; refer to 18.30.52.
12. Detach engine harness retaining clip from rear of charge air
cooler.

13. Di
sconnect hoses from charge air cooler.
Pla

ce absorbent cloth in appropriate position.
Di
sc
onnect hoses.

14 . CAUTI
ON: Take care to avoi
d dropping any objects or
foreign matter into engine inle t duct with charge air cooler
removed.
Remove charge air cooler from the engine. 1. Remove eight bolts.
Remove charge air cooler.
2
. Discard gasket.
Cle
a
n all mating faces.
1.
Install ch arge air
cooler to adaptor.
1. Install new gasket.
2. Install charge air cooler.

2.
Conne
ct hoses to charge air cooler.
Conne

ct hoses.
3. Install intake air te mperature sensor 2 to charge air cooler;
refer to 18.30.52.
4. Install supercharger; refer to 18.50.15.
5. Install supercharger driv e belt; refer to 18.50.08.
6. Install engine coolant outlet pipe; refer to 26.31.08.
7. Install supercharger outlet du ct and new gasket; refer to
18.50.16.
8. Install throttle intake elbow; refer to 19.70.28.
9. Install exhaust gas re-circulation valve (EGR) if applicable;
refer to 17.45.01.
10. Install throttle body; refer to 19.70.04.
11. Install air cleaner cover / intake assembly; re fer to 19.10.30.
12. Refill cooling system; refer to (SC) (26.10.01).
13. Reconnect battery ground cable (IMPORTANT, see SRO
86.15.15 for further information).

Intake Air Distribution and Filtering - Supercharger
Remo
val and Installation
Remov
a
l
Installation
1. Disc onne
ct battery ground cable (IMPORTANT, see SRO
86.15.19 for further information).
2. Drain radiator coolant; refer to 26.10.01.
3. Remove air cleaner cover / intake assembly; refer to 19.10.30.
4. Remove throttle body; refer to 19.70.04.
5. Remove exhaust gas re-circulation valve (EGR) if installed;
refer to 17.45.01.
6. Remove throttle intake elbo w; refer to (SC) 19.70.28.
7. Remove supercharger outlet duct; refer to 18.50.16.
8. Remove coolant outlet pipe; refe r to operation (SC) 26.31.08.
9. Remove supercharger drive belt; refer to 18.50.08.
10. Disconnect remaining coolant hoses from charge air coolers.
Position pipes to facilitate removal
of supercharger.
Inst
al
l suitable blanking plugs.

11 .
R
emove supercharger from engine.
1. Remove bolt.
2. Remove bolts .
3. Remove supercharger.

1. Inst al
l supercharger.
2. Connect all hoses to charge air coolers.
3. Install supercharger driv e belt; refer to 18.50.08.
4. Install engine coolant outlet pipe; refer to 26.31.08.
5. Install supercharger outlet du ct and new gasket; refer to
18.50.16.
6. Install throttle intake elbow; refer to 19.70.28.
7. Install exhaust gas re-circulation valve (EGR) if applicable;

Intake Air Distribution and Filtering - Thrott
le Body Elbow
Re
mo
val and Installation
Remov
a
l
1.
WARNING: B E
FORE PROCEEDING, IT IS ESSENTIAL THAT

WARNING NOTES GIVEN IN SECTION 100-00 (UNDER HEADING
'SAFETY PRECAUTIONS') AR E READ AND UNDERSTOOD.
Disconnect battery ground cable (IMPORTANT, see SRO
86.15.19 for further information).
2. Re
move air cleaner cover / inta
ke assembly; refer 19.10.30.
3. Remove throttle assemb ly; refer to 19.70.04.
4. Remove exhaust gas recirculation (EGR) valve where installed;
refer 17.45.01.

5. Re
lease intake elbow from right-hand support bracket.
Re
lea
se brake servo vacuum pi
pe and disconnect pipe.
1. Disconnect vacuum pipe.
2. Remove upper bolt.

6. Relea
se intake elbow from le
ft-hand support bracket.
1. Disconnect vacuum pipe.
2. Disconnect engine breather T-piece.
3. Remove upper bolt.
4. Loosen, but do not remove, lower two bolts.

7. Re
move intake elbow from supercharger.
1. Release and pull back cl ips securing bypass hoses
at charge air coolers.
2. Remove four bolts.
3. Remove hoses from charge air cooler stub pipes.
Re move as
sembly from vehicle.
4. Discard gasket.
Cle a
n all mating faces.
8. Remove by-pass valve assembly from intake elbow.

I
nstallation

1.
Remove two bolts.
Re

move by-pass assembly from
elbow and discard O-ring.
9. Where necessary, remove blanki ng plate from intake elbow.
Re
move bolts.
Di

scard gasket.
Cle

an all mating faces.
1. Where necessary, install blanking plate to intake elbow.
Inst
all new gasket.
Inst

all bolts (18-24Nm).

2. Inst
all by-pass valve assembly to intake elbow.
Inst

all new O-ring and lubricate with petroleum jelly.
1. Install bolts.

3. Install
intake elbow to supercharger.
1. Install two bolts to intake elbow and install new gasket.
2. Position intake elbow assembly with by-pass hoses located on charge air cooler stub pipes.
3. Install and tighten four bolts .
4. Position hose securing clips.
4. Install left-hand support brac ket to intake elbow and re-
connect pipework.
1. Install bolt.