Removing and installing rear air pipe: Audi A8 D2 3.3 TDI (AKF)

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Renewed: gaskets

Don't miss

• Seal off inlet connections with clean cloths.
• Mark vacuum hoses (2) prior to disconnection.
• Fig. shows right exhaust gas recirculation valve with engine removed.
• Fig. shows back of engine removed.
• Do not use silicone spray or silicone-based lubricants, as the silicone could damage the air mass meters.

🔧 Engine codes this applies to

📋 Procedure

1. Carefully detach engine cover from retaining pins .
2. Detach engine cover (arrows).
3. Unclip cover (2) for air duct at lock carrier.
4. Remove air duct (1).
5. Slacken off bolt (arrow) for torque reaction support by 6 turns.

6. Unfasten quick-release fasteners (2) and detach rear noise insulation.
7. Screw out bolts (1) and (2) for gearbox mountings on left and right.
8. Remove top air pipe with air hose (arrows). [Note: Seal off inlet connections with clean cloths.]
9. Unscrew clamp (1).
10. Mark vacuum hoses (2) prior to disconnection.
11. Detach vacuum hoses (2 ... 5).
12. Sever cable ties (arrows).
13. Set down wiring harness (1) to front.
14. Sever cable tie (arrow) in holder.
15. Screw out bolts (arrows) at mechanical exhaust gas recirculation valves on both sides. [Note: Fig. shows right exhaust gas recirculation valve with engine removed.]
16. Detach vacuum pipes, holder and both mechanical exhaust gas recirculation valves.
17. Unplug connector (2) for engine speed sender G28.
18. Unclip bottom part of connector with holder (1) from mounting rail.
19. Unscrew nut (2) and detach left part of mounting rail (1) in (direction of arrow).
20. Use lifting platform to raise vehicle approx. 20 cm.
21. Place a suitable wooden block on a trolley jack and position this behind the ATF pan at the point marked with an (arrow) on the gearbox housing.
22. Use the trolley jack to raise the automatic gearbox slightly until the engine tilts forward somewhat, thus providing access to the bulkhead.
23. Pull out retaining clips (1) and (2) approx. 10 mm.
24. Detach rear air pipe first from left and then from right air mass meter.
25. Guide out rear air pipe upwards (arrows). [Note: Fig. shows back of engine removed.] [Note: Replace gaskets and seals.Re-attach all cable ties unfastened or severed on removal at the same location on installation.Secure all hose connections with standard clamps Parts catalogue.Hose connections and hoses must be free of oil and grease before fitting.]
26. Coat O-rings in rear air pipe with fuel. [Note: Do not use silicone spray or silicone-based lubricants, as the silicone could damage the air mass meters.]
27. Pull out retaining clips (1) and (2) approx. 10 mm.
28. Press left and then right air mass meter into rear air pipe (arrows).
29. Engage air mass meters with retaining clips.
30. Check firm attachment of air mass meters in air pipe.
31. Engage rear air pipe at intake manifold.
32. Install left and right gearbox mountings.

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