Discovery 2. Manual — part 525

MANIFOLDS AND EXHAUST SYSTEMS - V8

DESCRIPTION AND OPERATION

30-2-7

Tail pipe assembly
The tail pipe is of welded and fabricated construction. It connects to the intermediate pipe with a flanged joint secured
with studs and locknuts and sealed with a metal gasket. The pipe is shaped to locate above the rear axle allowing
clearance for axle articulation. The pipe is also curved to clear the left hand side of the fuel tank which has a reflective
shield to protect the tank from heat generated from the pipe.

A fabricated silencer is located at the rear of the tail pipe. The silencer is circular in section and is constructed from
stainless steel sheet. A baffle tube is located inside the silencer and the space around the baffle tube is packed with
a stainless steel fibre. The holes in the baffle tube allow the packing to further reduce combustion noise from the
engine. The tail pipe from the silencer is curved downwards at the rear of the vehicle and directs exhaust gases
towards the ground. The curved pipe allows the exhaust gases to be dissipated by the airflow under the vehicle and
prevents gases being drawn behind the vehicle.

The tail pipe is attached by a bracket, positioned forward of the silencer, and a mounting rubber to the chassis. The
mounting rubber allows ease of alignment and vibration absorption.

MANIFOLDS AND EXHAUST SYSTEMS - V8

30-2-8

DESCRIPTION AND OPERATION

MANIFOLDS AND EXHAUST SYSTEMS - V8

REPAIRS

30-2-9

REPAIRS

Front pipe

$% 30.10.09

Remove

1. Release front HO2S multiplugs from support

brackets and disconnect multiplugs.

2. Raise vehicle on ramp.

3. Where fitted, release rear HO2S multiplugs

from support brackets on transfer box and
disconnect multiplugs.

4. Remove 8 bolts securing cross member and

remove cross member.

MANIFOLDS AND EXHAUST SYSTEMS - V8

30-2-10 REPAIRS

5. Remove 2 nuts securing front pipe to

intermediate pipe/silencer.

6. Remove 6 nuts securing front pipe to exhaust

manifolds.

7. Release front pipe and collect front pipe to

manifold gaskets.

8. With assistance remove front pipe.
9. Remove HO2S from front pipe.

Refit

1. If refitting existing HO2S, apply anti-seize

compound to HO2S threads.

NOTE: A new HO2 sensor is supplied pre-
treated with anti-seize compound.

2. Fit HO2S to front pipe and tighten to 45 Nm (33

lbf.ft).

3. Clean front pipe and mating faces.
4. Position front pipe, with new front pipe to

manifold gaskets, and align front pipe with
intermediate pipe/silencer and exhaust
manifolds.

5. Fit and tighten exhaust manifold nuts to 30 Nm

(22 lbf.ft).

6. Fit and tighten intermediate pipe/silencer nuts

to 25 Nm (18 lbf.ft).

7. Fit chassis cross member and tighten bolts to

25 Nm (18 lbf. ft).

8. Connect HO2S multiplugs and secure to

support brackets.

Intermediate pipe/silencer

$% 30.10.11

Remove

1. Raise vehicle on ramp.

2. Remove 2 nuts securing intermediate pipe/

silencer to front pipe.

3. Remove 3 nuts securing intermediate pipe/

silencer to tail pipe.

4. Release intermediate pipe/silencer from

mountings and remove intermediate pipe/
silencer.

5. Collect intermediate pipe/silencer to tail pipe

gasket.

Refit

1. Clean intermediate pipe/silencer, front pipe and

tail pipe mating faces.

2. Position intermediate pipe/silencer and locate

on mountings.

3. Using a new intermediate pipe/silencer to tail

pipe gasket, align intermediate pipe/silencer
with tail pipe and front pipe.

4. Fit nuts to intermediate pipe/silencer and

tighten to 25 Nm (18 lbf.ft).