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Separating Y-pipe and rear silencer - vehicles with four-wheel drive > < Disconnecting centre silencer and rear silencer - vehicles with front-wheel drive

A4 Cabriolet Mk2

Exhaust system on vehicles with four-wheel drive - exploded view
   
Exhaust system on vehicles with four-wheel drive - exploded view
1 - Y-pipe
q   Combined in one unit with rear silencers as original equipment. Can be renewed individually for repair purposes
q   Cutting point → Anchor
q   Align exhaust system so it is free of stress → Chapter
2 - 25 Nm
3 - Mounting
q   Renew if damaged
4 - Gasket
q   Renew
5 - 27 Nm
q   Renew
q   Coat with high-temperature paste; for high-temperature paste refer to → Electronic parts catalogue
6 - Temperature sender before particulate filter -G506-
q   Tighten to 45 Nm
q   Removing and installing → Chapter
7 - Turbocharger
8 - Gasket
q   Renew
9 - Pressure line
q   Tighten union nuts to 30 Nm.
10 - Lambda probe -G39-
q   Threads of new Lambda probes are already greased with assembly paste; the paste must not get into the slots on the probe body
q   When re-using the old Lambda probe, grease thread with high-temperature paste lubricant; the paste must not get into the slots of the probe body. High-temperature paste → Electronic parts catalogue
q   Remove and install using ring spanner for Lambda probe -3337- → Rep. Gr.23
q   Tighten to 55 Nm
11 - Particulate filter
q   Removing and installing → Chapter
q   Protect against knocks and impact
q   After renewing particulate filter perform adaption in “Guided Fault Finding” mode → Vehicle diagnosis, testing and information system VAS 5051
12 - Pressure line
q   Tighten union nuts to 30 Nm.
13 - Temperature sender after particulate filter -G527-
q   Tighten to 45 Nm
q   Removing and installing → Chapter
14 - 23 Nm
q   Renew
q   Coat with high-temperature paste; for high-temperature paste refer to → Electronic parts catalogue
15 - Front exhaust pipe
q   With flexible joint
q   Do not bend flexible joint more than 10° – otherwise it can be damaged
q   Removing and installing → Chapter
q   Mounting components → Chapter
q   Align exhaust system so it is free of stress → Chapter
16 - Clamp (front)
q   Installation position → Fig.
q   Before tightening, align exhaust system so it is free of stress → Chapter
q   Tighten bolt connections evenly
17 - 23 Nm
18 - 25 Nm
19 - Tailpipe
q   Renewing → Fig.
20 - Clip
21 - Mounting
q   Renew if damaged
q   Check preload → Chapter „Stress-free alignment of exhaust system“
22 - 23 Nm
23 - Rear silencer
q   Combined in one unit with centre silencer as original equipment. Can be renewed individually for repair purposes
q   Cutting point → Anchor
q   Align exhaust system so it is free of stress → Chapter
24 - 23 Nm
25 - Connecting bracket
26 - 23 Nm
27 - Clamp (rear)
q   For separate replacement of centre and rear silencers
q   Before tightening, align exhaust system so it is free of stress → Chapter
q   Installation position → Fig.
q   Tighten bolt connections evenly

   
Installation position of front clamp
–  Fit clamp so that ends of bolts do not protrude beyond bottom of clamp.
l  Bolt connection faces to left.
  A26-0159
Installation position of rear clamps
–  Fit clamps so that ends of bolts do not protrude beyond bottom of clamps.
l  Bolt connections face outwards.
  A26-0807
Renewing tailpipe
–  Cut through old tailpipe -1- at a right angle at cutting point -C-.
  Note
The illustration shows the tailpipe for a vehicle with petrol engine.
–  Push new tailpipe -3- onto tailpipe as far as marking -A-. Slot on tailpipe should align with marking -B-.
–  Tighten clamp connection -2- to 25 Nm.
  A26-0475

Separating Y-pipe and rear silencer - vehicles with four-wheel drive > < Disconnecting centre silencer and rear silencer - vehicles with front-wheel drive