1998 JAGUAR X308 ECU

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

2. 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)

3.
Re
move the four nuts which se
cure the downpipe catalytic
converter to the exhaust manifold.
4. Raise the vehicle on a ramp.

5. Re
move the bolts which secure
the rear of the front muffler
assembly to the engine rear mounting.
6. Remove the nuts which secure the front flanges of the front
muffler to the downpipe flanges.

I
nstallation


7.
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.

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. Fit the downpipe catalytic converter.
1. Fit the downpipe assembly 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. Tighte
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. Raise the vehicle on the ramp.

7. Tigh ten th
e mounting brac
ket securing bolts.
8. Connect the downpipe catalytic 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.

9. F
it 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.
10. Lower the ramp.
11. Remove the paintwork protection sheets and close the engine
cover.

Ex
haust System - Front Muffler4.0L SC V8 - AJ26
Re
mo
val and Installation
Remov
a
l
Installation
1. Ra
ise the vehicle on a ramp.

2. Separate the front muf f
ler flan
ge joints from the downpipe
catalytic converters.
Slac ken t
he flange nuts (left-hand and right-hand sides),
catalytic converter to front muffler.

3. Slacken the clamps (left-ha nd and right-hand sides),
i
ntermediate mufflers to front muffler.
Move both i
n
termediate mufflers rearwards, as far as
possible.
4. Remove the flange nuts (lef t-hand and right-hand sides),
catalytic converter to front muffler.

5. Re
move the bolts which secure th
e front muffler rear mounting
to the rear of the gearbox.
6. Remove the front muffler.
Di
sconnect the front muffler fr
om each downpipe flange.
Di
sconnect the front muffler
from the intermediate
mufflers and remove it.
7. Remove the gasket from each front flange joint.
8. Clean and inspect al l exhaust joints.
1. Fit the front muffler.

F
it the front muffler fully into
the intermediate mufflers.

2. Con
nect the front muffler flanges to the catalytic converters.
F

it a new gasket to each flange.
Con

nect the front muffler flanges to the catalytic
converters; move the front muffler / intermediate
mufflers assembly forwards.
Tigh
ten the flange nuts (left-hand and right-hand sides),
front muffler to catalytic converters.

3. F
it the bolts which secure the front muffler rear mounting to
the rear of the gearbox.

4. Re
position the intermediate mu
fflers to the front muffler to
align the correct referenc e / index indicator ring.
Ti
ghten the clamps (left-han
d and right-hand sides),
intermediate mufflers to front muffler.
5. Lower the ramp.

Exhaust System - Intermediate Muffler LH4.0L NA V8 - AJ27/3.2L NA V8 -
AJ26
Re mo
val and Installation
Remova

l
1.
Ra
ise the vehicle on a four-post ramp.
2. Raise the rear of the vehicle bo dy and support on two stands,
located under the re ar jacking points.

3. Disc
onnect the intermediate
muffler from the rear muffler.
Slacken the securi
ng clamp, re
ar muffler to intermediate
muffler and separate the in termediate muffler from the
rear muffler.

4. Move the front muf f
ler forwar
d to allow the intermediate
muffler to be removed.
Sl acke
n the securing clamps (left-hand and right-hand
sides) front muffler to downpipe catalytic converters.
Move the front muf f
ler
assembly forward.

5. Re
move the intermediate muffler.
Sl
acken the securi
ng clamp, front muffler to intermediate
muffler and separate the in termediate muffler from the
front muffler.
6. Remove the muffler assembly from the axle carrier and from
the over-axle mounting rubber.

5.
NO TE
: If necessary, loosen and rotate the intermediate
muffler, at the front to intermediate muffler joint, to achieve the
tailpipe trim settings. Refer to Specifications in this section.
Correctly position the rear muffler assembly.
Connect the rear muffl
er to the intermediate muffler and
insert to the Nominal indicator ring, rotating back and
forth to aid engagement.
Chec k
that the mounting is located correctly into the
mounting rubber.
Chec k
that the tailpi
pe position is wi thin the specified
settings, adjusting engageme nt within the Maximum and
Minimum indicator rings if necessary. Refer to
Specifications in this section.

6. Tigh te
n the securing clamp, in
termediate muffler to rear
muffler.
7. Remove the axle stands from be neath the rear jacking points.
8. Lower the ramp.