Stress-Free Alignment Of Exhaust System - Audi A8 2003 Workshop Manual

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
– Unscrew nuts -1 ... 10-.
– Detach exhaust manifold.
Installing
Installation is carried out in the reverse order; note the following:
Note
Renew seals, gaskets and self-locking nuts.
– Install turbocharger (right-side)
Tightening torques
Component
Exhaust manifold to cylinder head
Torque reaction support to engine
• 1)
Renew nuts.
•
21)
Coat with high-temperature paste; for high-temperature
paste refer to ⇒ Electronic parts catalogue
1.19

Stress-free alignment of exhaust system

Procedure
Note
The exhaust system must be aligned when it is cool.
– Loosen bolt connections of all exhaust system clamps.
– Press rear silencer to front -arrow- until the rubber mountings
are pre-loaded to the specified dimensions:
• Rubber mounting (front): -a- = 11 mm.
• Rubber mounting (rear): -a- = 14 mm.
– Align rear silencer horizontally.
– Position clamps so that they align with centre of cutting loca‐
tions.
– Align front clamps so that ends of bolts do not protrude beyond
bottom of clamps.
– Tighten bolts on clamps evenly to 23 Nm.
⇒ page 258 .
Nm
1)2)
25
42
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1. Removing and installing parts of exhaust system
Audi A8 2003 ➤
313