1998 JAGUAR X308 lower

E
xhaust System - Catalyti
c Converter RH4.0L 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. Remove the front muffler; refer to Operation 30.10.18 in this
section.

3. CAU
TION: Note the position of the upstream and
downstream (where fitted) o xygen sensor multiplugs for
reassembly.
Disconnect the oxygen sensor multiplugs.
Di
splace the multiplugs from the engine mounting bracket.

D
isconnect the plug(s) from the oxygen sensor(s)

4.
R
emove the four nuts which se
cure the downpipe catalytic
converter to the exhaust manifold.
5. Raise the vehicle on a ramp.

6. R
emove the downpipe catalytic converter.
R

emove the bolts which se
cure the downpipe lower
mounting bracket.
Remove the
downpipe assembly.
7. Remove the oxygen sensor(s).
The downstream sensor i
s fitt
ed only for North American
markets.

In
stallation

8.
Re
move gasket from the manifold flange.
Clean and inspect th
e manif
old joint faces.
Clean and inspect th
e threads on th
e downpipe studs.

1. Fit
the oxygen sensor(s).
The downstream sensor i
s
fitt
ed only for North American
markets.
2. Fit a new gasket to the mani fold mating flange on the
downpipe.

3. Fit
the downpipe catalytic converter.
Fit the down
pipe assemb l
y 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.)
4. Lower the ramp.
5. Tighten the nuts securing the downpipe flange to the manifold
flange.

6.
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.
7. Raise the ramp.

8. Tigh
ten the mounting brac
ket securing bolts.
9. Fit the front muffler; refer to Operation 30.10.18.
10. Lower the ramp.
11. Remove the paintwork protection sheets and close the engine
cover.

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. R
emove the oxygen sensor(s).
The downstream sensor i

s fitt
ed only for North American
markets.
10. 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
the oxygen sensor(s).
The downstream sensor is

fitt
ed only for North American
markets.
2. Fit a new gasket to the mani fold mating flange on the
downpipe.

3. 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.)
4. Lower the ramp.

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

6. 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.
7. Raise the vehicle on the ramp.
8. Tighten the mounting brac ket securing bolts.

9.
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.

10
.
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.
11. Lower the ramp.
12. Remove the paintwork protection sheets and close the engine
cover.

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.

10
.
Fit the front muffler; refer to Operation 30.10.18.
11. Lower the ramp.
12. Remove the paintwork protection sheets and close the engine
cover.