Aligning Tailpipes; Checking Exhaust System For Leaks - Audi A8 2003 Workshop Manual

Audi A8 2003 ➤
8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
– Align rear clamps so that ends of bolts do not protrude beyond
bottom of clamps.
– Tighten bolts on clamps evenly to 23 Nm.
1.20

Aligning tailpipes

Procedure
– Check clearance between tailpipes and bumper on both sides:
• Dimension -x- (left-side) = dimension -x- (right-side); tolerance
max. 2 mm.
– Check alignment angle of left and right-side tailpipes (side‐
ways inclination):
• Angle -α- = 5°
– If necessary, correct angle -α- as follows:
– Loosen clamping bolt on tailpipe and turn tailpipe as required.
– Tighten clamping bolt to 30 Nm.
If necessary, correct dimension -x- as follows:
– Slacken nut -arrow- on brace between exhaust pipes.
– Adjust the distance between the rear silencers.
– Tighten nut to 23 Nm.
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– Check distances -y- and -z- between tailpipes and bumper.
• Dimension -y- = 10 ... 14 mm.
• Dimension -z- = 13 ... 17 mm.
1.21

Checking exhaust system for leaks

– Start engine and run at idling speed.
– Plug tailpipes with cloth or plug, etc. while checking for leaks.
314
Rep. gr.26 - Exhaust system