Exhaust System, Servicing Audi TT 8N

Note. Always replace gaskets and self-locking nuts. After exhaust system repairs, make sure the exhaust system is not under stress and is far enough from the body. If necessary, loosen clamps and align mufflers and exhaust pipes so that there is adequate distance to the vehicle body, and weight is evenly distributed among the exhaust hangers. Use a screwdriver to unfasten and tighten lock washers for heat shields. Tightening torque: 2 Nm. The flex joint in the front exhaust pipe must not be bent more than 10° , otherwise it may be damaged.

Scheme 231

1 - 23 Nm

2 - Mounting

1. Replace if damaged

3 - 40 Nm

4 - Rear clamp

1. For separate replacement of center and rear mufflers
2. Installed position. Refer to «Installed position of rear clamp»(ref-276269-S10121911362008021500000)
3. Before tightening, adjust exhaust system free of stress. Refer to «Exhaust system, aligning free of stress»(ref-276269-S03604659422008010300000)
4. Tighten bolt connections evenly

5 - Center muffler

1. Center and rear muffler are one unit as original equipment and can be replaced individually for repair purposes
2. Cutting location. Refer to «Center and rear muffler, separating»(ref-276269-S11455989152008010300000)
3. Align exhaust system so it is free of stress before tightening clamp. Refer to «Exhaust system, aligning free of stress»(ref-276269-S03604659422008010300000)

6 - Rubber mounting

1. Replace if damaged

7 - 23 Nm

8 - Bracket

1. For exhaust system mounting in driveshaft tunnel.

9 - 23 Nm

1. Replace

10 - Front exhaust pipe with flexible joint

1. Do not bend flexible joint more than 10° otherwise it can be damaged
2. Removing and installing. Refer to «Front exhaust pipe, removing and installing»(ref-276269-S14199160892008010300000)
3. Align exhaust system so it is free of stress before tightening clamp. Refer to «Exhaust system, aligning free of stress»(ref-276269-S03604659422008010300000)

11 - 40 Nm

1. Replace

12 - Gasket

1. Replace

13 - Exhaust manifold

1. Removing and installing. Refer to «Exhaust manifold, removing and installing»(ref-276269-S02755605282008010300000)

14 - 23 Nm

1. Replace

15 - Heated oxygen sensor

1. 2x
2. Threads of new oxygen sensors are already greased with assembly paste. Paste must not get into slots on sensor body
3. When reusing old oxygen sensor, grease threads lightly with hot bolt paste
4. Removing and installing

Refer to 24 MULTIPORT FUEL INJECTION (MFI)

16 - Gasket

17 - Oxygen sensor behind catalytic converter

1. 2x
2. Threads of new oxygen sensors are already greased with assembly paste. Paste must not get into slots on sensor body
3. When reusing old oxygen sensor, grease threads lightly with hot bolt paste
4. Removing and installing

18 - Catalytic converter

1. Protect from damage due to impact
2. Aligning. Refer to «Aligning catalytic converter»(ref-276269-S22922737912008021500000)

19 - Front clamp

1. Align exhaust system so it is free of stress before tightening clamp. Refer to «Exhaust system, aligning free of stress»(ref-276269-S03604659422008010300000)

20 - 40 Nm

21 - Rubber mounting

1. Replace if damaged

22 - Mounting

1. Replace if damaged

23 - 23 Nm

24 - Rear muffler

1. Rear and center muffler are one unit as original equipment. Can be replaced individually for repair purposes
2. Cutting location. Refer to «Center and rear muffler, separating»(ref-276269-S11455989152008010300000)
3. Align exhaust system so it is free of stress before tightening clamp. Refer to «Exhaust system, aligning free of stress»(ref-276269-S03604659422008010300000)

Scheme 232

1. Install clamps so that bolt ends do not project beyond lower edge of clamp (arrow).

1. Threaded connections face to right

Scheme 233

1. Install clamp so that bolt end does not project over lower edge of double clamp.

1. Bolt connection faces to left

Scheme 234

1. Align catalytic converter horizontally.

Distance to heat shield on right and on left in tunnel should be same on both sides.

1. Distance x = x