AUDI A4 1998 B5 / 1.G APB Engine Exhaust System Components Workshop Manual

26-1


Exhaust system components,
removing and installing

Notes:

Removing and installing exhaust manifold
Page 26
-17


After working on the exhaust system ensure
that the system is not under stress, and that it
has sufficient clearance from the bodywork. If
necessary, loosen double and single clamps
and align muffler and exhaust pipe so that
sufficient clearance is maintained to the
bodywork and the support rings are evenly
loaded.
Aligning exhaust system free of stress Page 26
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Replace self-locking nuts.
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26-2


Mufflers with mountings, removing and
installing

1 -
40 Nm
2 -
From catalytic converter
3 -
Flat-head bolt
4 -
Double clamp
5 -
25 Nm
6 -
Mounting
With retaining ring
7 -
Front muffler
8 -
Double clamp (for repairs)
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26-3


9 -
Separating point
Front and rear mufflers are installed as one
component when vehicle is built. For
repairs, front muffler and rear muffler can
be replaced separately and connected with
a double clamp. Cutting through connecting pipe Fig. 1
10 -
Rear muffler (right)
11 -
Mounting
12 -
Bracket
13 -
Rear muffler (left)
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26-4


Note: Fig. 1 Separating point between center muffler and rear muffler
A separating point has been provided for replacement of the center
muffler or rear muffler in the event that repair work is necessary. A double clamp is used to attach the center and rear mufflers.
- Separate connecting pipe between center muffler and rear muffler
where indicated by groove.
Dimension - a - approx.160 - 170 mm.
- Adjust exhaust system Page 26
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26-5

Catalytic converter, removing and
installing


Removing

- Remove bolts -arrows- and take off engine cover panels -A ... C-.

- Remove air distributor component -arrows-.
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26-6

Right-hand catalytic converter:

Left-hand catalytic converter: - Disconnect connector -1- for oxygen sensor at bulkhead.

- Disconnect connector -2- for oxygen sensor at bulkhead.
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26-7


- Unbolt heat shield -2- on turbocharger.
- Remove upper bolt -3- securing front exhaust pipe to turbocharger.

- Unbolt guard plate -arrows- above drive shaft from transmission.
- Unbolt drive shaft -1- at transmission and tie up.
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26-8


- Remove cross strut -arrows-.

- Remove retainers -arrows-.
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26-9


- Remove transmission support -arrows-.
- Loosen exhaust system clamp and push clamp towards muffler.

Note:
Avoid excessive bending of the flexible pipe connection (de-coupling
element) on the front exhaust pipe. The angle between the catalytic
converter and the front exhaust pipe must not exceed 10 , otherwise the
flexible connection will be damaged. - Loosen hose clamp -1- on turbocharger heat shield.
- Unbolt exhaust pipe -2- from turbocharger.
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26-10

Installing

- Install in reverse order.

Note:
The double clamp must be replaced after
removeing the bolted connection.

- Adjust exhaust system Page 26
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