engine AUDI A4 1997 B5 / 1.G AWM Engine Exhaust System Components Workshop Manual

26-3


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
9 -
Turbocharger Removing and installing Page 21
-51
10 -
Catalytic converter
Protect from damage by impactRemoving and installing Page 26
-27
11 -
Oxygen sensor - 55 Nm
Upstream of catalytic converterGrease only the threads with high-
temperature lubricant G 052 112 A3. The
lubricant must not get into the slots on the
sensor body. Checking:
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26-4


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
12 -
Oxygen sensor - 55 Nm Downstream of catalytic converterGrease only the threads with high-
temperature lubricant G 052 112 A3. The
lubricant must not get into the slots on the
sensor body. Checking:
13 -
Gasket
Always replace
14 -
Front exhaust pipe With flexible connection (de coupling
element) Do not bend flexible connection more than
10 - otherwise it can be damaged. Removing and installing Page 26
-32
Align exhaust system so it is free of stress
before tightening clamp Page 26
-34

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26-10


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
7 -
Gasket Always replace
8 -
Turbocharger Removing and installing Page 21
-51
9 -
Catalytic converter
Protect from damage by impactRemoving and installing Page 26
-27
10 -
Oxygen sensor - 55 Nm
Upstream of catalytic converterGrease only the threads with high-
temperature lubricant G 052 112 A3. The
lubricant must not get into the slots on the
sensor body. Checking:
Pa
ge 10 of 41 Exhaust s
ystem com
ponents, removin
g and installin
g
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yp
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26-11


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
11 -
Oxygen sensor - 55 Nm Downstream of catalytic converterGrease only the threads with high-
temperature lubricant G 052 112 A3. The
lubricant must not get into the slots on the
sensor body. Checking:
12 -
Gasket
Always replace
13 -
Front exhaust pipe With flexible connection (de coupling
element) Do not bend flexible connection more than
10 - otherwise it can be damaged. Removing and installing Page 26
-32
Align exhaust system so it is free of stress
before tightening clamp Page 26
-37

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ystem com
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g
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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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26-28


Note:
Coolant hoses -1- and -3- do not have to be disconnected. - Unbolt coolant expansion tank -2-, -arrows-.
- Disconnect wire to Engine Coolant level (ECL) Warning switch -F66-
and move coolant expansion tank to one side.

- Disconnect wiring connector for oxygen sensors and move wiring
aside.
1 - (brown) to oxygen sensor downstream of catalytic converter -G130-
2 - (black) to oxygen sensor upstream of catalytic converter -G39-
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26-40

Checking exhaust system for leaks


- Start engine and run at idling speed.

- Plug tailpipes with cloths or stoppers, etc. until
leakage check is completed.

- Listen for noise at the connection points
(cylinder head/manifold, manifold/turbocharger,
turbocharger/catalytic converter, etc.) to locate
any leaks.

- Repair any leaks that are found.
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