Audi TT (2007 year). Manual - part 56

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Using a commercially available connection piece, connect

charge air system tester -V.A.G 1687- to compressed air -1-.

Note

If there is water in sight glass, remove drain plug -6- and drain

water.

– Open valve -3-.

Caution

Risk of damage if pressure is set too high.

♦ The pressure must not exceed 0.5 bar.

– Adjust pressure to 0.5 bar via pressure control valve -2-.
– Open valve -4- and wait until test system is pressurised. If

necessary, adjust pressure to 0.5 bar again.

– Check charge air system for audible leaks or leaks that can be

felt with the hand; apply commercially available leak detecting

spray or use ultrasonic tester -V.A.G 1842- .

Note

♦

A small amount of air escapes through the valves and enters

the engine. Therefore it is not possible to perform a pressure

retention test.

♦

For operation of ultrasonic tester -V.A.G 1842- , refer to ⇒

Operating instructions .

♦

Release pressure in test circuit by detaching hose coupling

from adapter before removing adapter.

♦

Hose connections and air pipes and hoses must be free of oil

and grease before assembly.

♦

Secure all hose connections with the correct type of hose clips

(same as original equipment) ⇒ Electronic parts catalogue .

♦

To ensure that the air hoses can be properly secured at their

connections, spray rust remover onto the worm thread of used

hose clips before installing.

2. Charge air cooling

215

26 – Exhaust system

Silencers

Note

♦

After working on the exhaust system, ensure that the system

is not under stress and that it has sufficient clearance from the

body. If necessary, loosen clamp and align silencers and ex‐

haust pipe so that sufficient clearance is maintained to the

body at all points and the mountings are evenly loaded.

♦

Use screwdriver to unfasten and tighten lock washers for heat

shields. Tightening torque: 2 Nm.

1.1

Silencers - exploded view

1 - Centre silencer

❑ Combined with rear si‐

lencer

❑ Align exhaust system so

it is free of stress

⇒ page 221

2 - Rubber mounting

❑ Renew if damaged

3 - Rubber mounting

❑ Renew if damaged

4 - Bracket
5 - Bolt

❑ 23 Nm

6 - Mounting

❑ Renew if damaged

7 - Nut

❑ 23 Nm

8 - Bracket (bottom)

❑ For particulate filter

9 - Nut

❑ 23 Nm

10 - Bracket (top)

❑ For particulate filter

11 - Bolt

❑ 23 Nm

12 - Nut

❑ 23 Nm

13 - Nuts

❑ 9 Nm

216

14 - Heat shield
15 - Clamp

❑ For particulate filter
❑ Renew
❑ Installation position

⇒ page 218

❑ 7 Nm

16 - Seal

❑ Renew

17 - Particulate filter

❑ Removing and installing

⇒ page 218

❑ After renewing, perform “Adaption” in “Guided Functions” ⇒ Vehicle diagnosis, testing and information

system VAS 5051.

18 - Clamp (front)

❑ Before tightening, align exhaust system so it is free of stress

⇒ page 221

❑ Installation position

⇒ page 217

❑ Tighten bolt connections evenly

19 - Nut

❑ 23 Nm

20 - Bolt

❑ 23 Nm

21 - Rubber mounting

❑ Renew if damaged

22 - Bracket
23 - Nut

❑ 23 Nm

24 - Bolt

❑ 23 Nm

Installation position of front clamp
– Fit the clamp at the angle shown.
• Angle -α- = approx. 20°
• Bolt connections facing towards right
• Nuts facing upwards

1. Silencers

217

Installation position of clamp for particulate filter
• Angle -α- = 0 ± 10°

1.2

Removing and installing particulate filter

Special tools and workshop equipment required
♦ Engine support -3300 A-

sender 2 -G448- and move wiring clear.

Note

Disregard -items 1, 2, 4-.

– Slacken bolt -2- and remove clamp.

Note

Disregard -items 1, 3-.

218

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