1999 AUDI A4 AWM Engine Exhaust System Components Workshop Manual

26-17


Fig. 4 Individual parts of mounting for vehicles with automatic
transmission
1 - Disc
2 - Buffer
3 - Link
4 - Spacer
5 - Bolt - 25 Nm
6 - Bolt
7 - Disc
8 - Compression spring
9 - Spacer
10 - Nut, self-locking - 25 Nm
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26-18

Center and rear mufflers, separating

For individual replacement of the center or rear
muffler, a cutting point is marked on the
connecting pipe.
The cutting point is marked with an indentation
on the outside of the exhaust pipe.

Special tools and equipment

Body saw VAG 1523 AProtective goggles
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26-19

Vehicles with front wheel drive:

WARNING!
Wear protective goggles. - Cut exhaust pipe at right angles using body saw, e.g. VAG 1523 A, at
position marked -arrow-.
- When installing, position clamp centrally over saw cut.


Installation position of clamp -1-: Horizontally, bolted connections
face rear left wheel Fig. 2
, Page 26
-8
- Ensure exhaust system is aligned stress-free Page 26
-34
.
- Tighten bolted connections on clamp evenly to 40 Nm.
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26-20

Vehicles with all-wheel drive:

WARNING!
Wear protective goggles. - Cut exhaust pipe at right angles using body saw, e.g. VAG 1523 A, at
position marked -arrow-.
- When installing, position clamp centrally over saw cut.


Installation position of clamp -1-: Horizontally, bolted connections
face rear left wheel Fig. 2
, Page 26
-15

- Ensure exhaust system is aligned stress-free Page 26
-37
.
- Tighten bolted connections on clamp evenly to 40 Nm.
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26-21

Exhaust manifold, removing and
installing


Removing

Note:
The flexible connection in the front exhaust pipe
must not be deflected more than 10 or it may be
damaged.

- Remove engine cover panel -arrows-.

- Remove air filter cover -arrow-.
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26-22


- Remove bolts -arrows-.
- Remove air duct -1- and -2-.

- Disconnect wiring connectors as follows:
1 - on ACF valve (in addition, remove ACF valve from air filter housing)
2 - on mass air flow sensor
3 - on Wastegate Bypass Regulator valve -N75-
- Remove hose connections, move wiring aside and remove air filter
housing -arrows-.
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26-23


- Remove sound insulation -arrows-.

- Loosen bolts -1- and -2- by several turns.
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26-24


- Remove front hose from line of crankcase vent -2-.
- Disconnect front hose from line -1- of secondary air inlet.
- Remove heat shield -3-.

- Remove bolts -1- and -2- of oil feed line.
- Remove bolts -3- for exhaust turbocharger.
- Remove seal between exhaust turbocharger and exhaust manifold.
- Plug opening in suction duct of turbocharger with a clean cloth.
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