Removing and Installing Audi A8 D3

Note. Align exhaust system to relieve stress. See EXHAUST SYSTEM, ALIGNING TO RELIEVE STRESS . Check exhaust system for leaks. See EXHAUST SYSTEM, CHECKING FOR LEAKS . Separating point between center and rear mufflers, SEPARATING POINT BETWEEN CENTER AND REAR MUFFLERS Always replace gaskets and nuts The mountings for the center and rear mufflers look the same but have a different elasticity. See Parts list Exhaust manifold, removing and installing: see EXHAUST MANIFOLD, REMOVING AND INSTALLING

Note. The following list refers to items in (Scheme 1).

1. 25 Nm (18 ft lb)
2. 25 Nm (18 ft lb)
3. Exhaust manifold (left)
4. Gaskets for exhaust manifolds Metal side of gaskets must be toward cylinder head
5. Exhaust manifold (right)
6. Bolt
7. Retainer
8. Oxygen sensor- 50 Nm (37 ft lb) Checking, see «OXYGEN SENSOR CONTROL, CHECKING»(ref-216438-S34693784282006020800000) Apply grease G5. Be sure that no grease enters slot of oxygen sensor.
9. 25 Nm (18 ft lb) Always replace
10. Front exhaust pipe and Three Way Catalytic (TWC) converter (right)
11. Double clamp Tighten evenly - 40 Nm (30 ft lb) Installation position, see «Installation position of double clamps between catalytic converters and center muffler»(ref-196867-S37323754362006060600000) Always replace clamp after bolts were loosened.
12. Mounting Looks identical to Item 14, but has different elasticity. Attaches bracket to floor panel - bracket 25 Nm (18 ft lb)
13. Center muffler
14. Mounting Looks identical to Item 12, but has different elasticity. Attaches bracket to floor panel - bracket 25 Nm (18 ft lb)
15. Rear muffler Check tensioning of exhaust system. See «TAILPIPES, ALIGNING»(ref-196867-S27900527952005100900000) . Aligning tailpipes, see «TAILPIPES, ALIGNING»(ref-196867-S27900527952005100900000)
16. Bolt
17. Three Way Catalytic (TWC) converter (left)
18. Sealing ring
19. Nut - 25 Nm (18 ft lb) Always replace
20. Front exhaust pipe (left)

Scheme 1

Scheme 2

1. The cutting point between center an rear mufflers is used to replace parts separately if required.
2. Cut through connecting pipes between center and rear mufflers at points marked with groove
3. a = approx. 240 mm (9.5 in.)
4. b = approx. 200 mm (7,8in.)
5. Use two short double clamps to connect center to rear mufflers.
6. Installation position of rear double clamps, see «INSTALLATION POSITION OF REAR DOUBLE CLAMPS»(ref-196867-S29853619162005100900000) .
7. Bolt ends must not protrude beyond bottom of clamp.
8. Aligning tailpipes, see «TAILPIPES, ALIGNING»(ref-196867-S27900527952005100900000) .
9. Aligning rear mufflers, see «TAILPIPES, ALIGNING»(ref-196867-S27900527952005100900000) .

Scheme 3

1. Remove engine. See «ENGINE, REMOVING AND INSTALLING»(ref-196865-S01591740882005100900000). For left exhaust manifold only
2. Remove guide tube for oil dipstick -arrow-. Both exhaust manifolds
3. Remove exhaust manifold -arrows-. (Scheme 4)

Scheme 4