1998 JAGUAR X308 ECU

Exha
ust System - Catalyti
c Converter Gasket LH4. 0L NA V8 - AJ27/3.2L
NA V8 - AJ26
Re mo
val and Installation
Remova

l
1.
Op
en the engine compartment and fit paintwork protection
sheets.
2. Remove the front muffler; refer to Operation 30.10.18 in this
section.

3. Re
move the centre trim panel
from the engine compartment.
1. Remove the left hand side enclosure panel.
2. Remove the centre trim panel.

4. Repo
sition the expansion tank from the mounting.
1. Disconnect the coolant level sensor connector.
2. Remove the nuts which secures the tank.

5. CAUT
ION: Note the position of the upstream and
downstream (where fitted) o xygen sensor multiplugs for
reassembly.
Disconnect the oxygen sensor multiplugs.
Re
lease the multiplugs from th
e engine mounting bracket.

Dis
connect the plug(s) from the oxygen sensor(s)
6.
Re
move the four nuts which se
cure the downpipe catalytic
converter to the exhaust manifold.

I
nstallation

7.
R
aise the vehicle on a ramp.

8. R
emove the downpipe catalytic converter.
R

emove the bolts which se
cure the downpipe lower
mounting bracket.
Remove the
downpipe assembly.
9. Remove gasket from the manifold flange.
Clean and inspect th
e manifold joint faces.
Clean and inspect th

e threads
on the downpipe studs.
1. Fit a new gasket to the mani fold mating flange on the
downpipe.

2. F
it the downpipe catalytic converter.
Fit the down

pipe assemb
ly to the manifold
Fi
t, but do not fully tighten, the mounting bracket securing

bolts. (Leave loose until the nu ts securing the downpipe to
the exhaust manifold are fitted.)
3. Lower the ramp.
4. Tighten the nuts securing the downpipe flange to the manifold
flange.

5. Connec t
the oxygen sensor multiplugs.
Con
n
ect the plug(s) to the respective (previously noted)
sensor(s).
Cor r
ectly position the multiplu
gs on the mounting bracket.

6. Fi
t the coolant header tank.
1. Reposition the tank and fit the securing nuts.
2. Connect the harness connector

7. Re
fit the centre trim panel and th
e left hand enclosure panel to
the engine compartment.
1. Refit the centre trim panel.
2. Refit the left hand enclosure panel.
8. Raise the ramp.
9. Tighten the mounting brac ket securing bolts.

Exha
ust System - Cataly
tic Converter Gasket LH 4.0L SC V8 - AJ26
Remo
val and Installation
Remov
a
l
1.
Op
en the engine compartment and fit paintwork protection
sheets.

2. Re
move the centre trim panel
from the engine compartment.
1. Remove the left hand side enclosure panel.
2. Remove the centre trim panel.

3. Repo
sition the expansion tank from the mounting.
1. Disconnect the coolant level sensor connector.
2. Remove the nuts which secures the tank.

4. CAUT
ION: Note the position of the upstream and
downstream (where fitted) o xygen sensor multiplugs for
reassembly.
Disconnect the oxygen sensor multiplugs.
Di spl
ace the multiplugs from the engine mounting bracket.

Dis
connect the plug(s) from the oxygen sensor(s).

5.
Re
move the four nuts which se
cure the downpipe catalytic
converter to the exhaust manifold.

6. R
aise the vehicle on a ramp.

7. R
emove the bolts which secure
the rear of the front muffler
assembly to the engine rear mounting.

8. R
emove the nuts which secure
the front flanges of the front
muffler to the downpipe flanges.

9. R
emove the gasket from the front
muffler flange at each side.
R
eposition the front silencer rearwards.
R

emove the gasket from each flange.

10
.
Remove the downpipe catalytic converter.
R
emove the bolts which se
cure the downpipe lower
mounting bracket.
Remove the
downpipe assembly.
11. Remove gasket from the manifold flange.
Clean and inspect th
e manifold joint faces.
Clean and inspect th

e threads
on the downpipe studs.

In
stallation
1.
Fit a ne
w gasket to the mani
fold mating flange on the
downpipe.

2. Fit
the downpipe catalytic converter.
1. Fit the downpipe assembly to the manifold.
Fit,
but do not fully tighten, the mounting bracket securing

bolts. (Leave loose until the nu ts securing the downpipe to
the exhaust manifold are fitted.)
3. Lower the ramp.

4. Tigh te
n the nuts securing the downpipe flange to the manifold
flange.

5. Connec t
the oxygen sensor multiplugs.
Con
n
ect the plug(s) to the respective (previously noted)
sensor(s).
Cor r
ectly position the multiplu
gs on the mounting bracket.

6. Fi
t the coolant header tank.
1. Reposition the tank and fit the securing nuts.
2. Connect the harness connector
7. Refit the centre trim panel and th e left hand enclosure panel to
the engine compartment.

1
. Refit the centre trim panel.
2. Refit the left hand enclosure panel.
8. Raise the vehicle on the ramp.

9. Tigh
ten the mounting brac
ket securing bolts.

10
.
Connect the downpipe cataly tic converter to the front
muffler.
1. Position a new gasket to the flange studs at each side.
2. Connect the the front mu ffler assembly to each
downpipe.
3. Fit and tighten the nuts to secure the muffler to the downpipes.

11
.
Fit the front muffler rear mounting.
1. Reposition the front mu ffler and align the rear
mounting.
2. Fit and tighten the bolts; muffler to mounting bracket.
12. Lower the ramp.
13. Remove the paintwork protection sheets and close the engine
cover.

do
wnpipe.

2. F
it the downpipe catalytic converter.
Fit the down

pipe assemb
ly to the manifold
Fi
t, but do not fully tighten, the mounting bracket securing

bolts. (Leave loose until the nu ts securing the downpipe to
the exhaust manifold are fitted.)
3. Lower the ramp.

4. Tigh
ten the nuts securing the downpipe flange to the manifold
flange..

5. Connec
t the oxygen sensor multiplugs.
Con

nect the plug(s) to the respective (previously noted)
sensor(s).
Cor
rectly position the multiplu
gs on the mounting bracket.
6. Raise the ramp.

7. Tigh
ten the mounting brac
ket securing bolts.
8. Fit the front muffler; refer to Operation 30.10.18.
9. Lower the ramp.


10

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