Audi Workshop Service and Repair Manuals

Notes:

• ◆ Always renew seals, gaskets and self-locking nuts.
• ◆ 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 clamp and align silencers and exhaust pipe so that sufficient clearance is maintained to the bodywork at all points and the mountings are evenly loaded.
• ◆ Slacken and tighten clamping plates for heat shields with a screwdriver.
  Tightening torque: 2 Nm

• Tunnel cross-piece
• ◆ With drilling for aligning exhaust system
• Centre silencer
• ◆ Centre silencer and rear silencer are one unit as original equipment, but can be renewed separately for repair purposes
• ◆ Cutting point => Page 26-10
• ◆ Aligning exhaust system free of stress => Page 26-18
• Mounting
• ◆ Installation position => Fig. 3, Page 26-8
• ◆ Renew if damaged
• 23 Nm

• 40 Nm
• ◆ Renew
• ◆ Coat studs on exhaust manifold with high-temperature paste
• ◆ High-temperature paste

=> Parts List

• ◆ Note tightening order => Page 26-17

• Gasket
• ◆ Renew
• ◆ Installation position on vehicles with engine code letters APG:
  Notch on flange of gasket points to rear (towards lambda probe)
• Exhaust manifold
• ◆ Removing and installing
  => Page 26-11

• 25 Nm
• Lambda probe - 55 Nm
• ◆ Before catalytic converter
• ◆ Grease only the threads with high-temperature lubricant. Lubricant must not get into the slots on the probe body.
• ◆ High-temperature lubricant

=> Parts List

• ◆ Checking:

=> Motronic injection and ignition system; Repair group 24

• ◆ Lambda probe connector located under a protective cover
  => Page 26-15

• Front exhaust pipe
• ◆ With catalytic converter
• ◆ Protect from damage by knocks and impact
• ◆ Removing and installing
  => Page 26-15
• ◆ Aligning exhaust system free of stress => Page 26-18

• Lambda probe - 55 Nm
• ◆ After catalytic converter
• ◆ Grease only the threads with high-temperature lubricant. Lubricant must not get into the slots on the probe body.
• ◆ High-temperature lubricant

=> Parts List

• ◆ Checking:

=> Motronic injection and ignition system; Repair group 24

• ◆ Lambda probe connector located under a protective cover
  => Page 26-15

• Front clamp
• ◆ Align exhaust system so it is free of stress before tightening clamp => Page 26-18.
• ◆ Installation position => Fig.26-7
• ◆ Tighten bolted connections evenly.
• 40 Nm
• Mounting
• ◆ Renew if damaged

• 23 Nm
• Rear silencer
• ◆ Rear silencer and centre silencer are one unit as original equipment, but can be renewed separately for repair purposes
• ◆ Cutting point => Page 26-10
• ◆ Aligning exhaust system free of stress => Page 26-18
• Mounting
• ◆ Renew if damaged
• 23 Nm
• Rear clamp
• ◆ For separate replacement of centre and rear silencers
• ◆ Installation position
  => Fig.26-8
• ◆ Tighten bolted connections evenly.
• 40 Nm
• 23 Nm

→ Fig.1    Installation position of front clamp

• ‒ Position clamp about 5 mm away from the respective marking line "A" -arrow 1- and tighten to 40 Nm.

Note:

Disregard mark "S" -arrow 2-.

• ‒ → Fit clamp so that end of bolt does not project beyond lower part of clamp circumference.
• ‒ Bolted connection on left

→ Fig.2    Installation position of rear clamp

• ‒ Install clamp so that ends of bolts are not below bottom circumference of clamp.
• ‒ Bolted connection points forward

→ Fig.3    Installation position of mounting

Angled end of base of mounting -arrow- faces in direction of travel.