Removing and installing alternator - vehicles with 4.2 ltr. FSI engine — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

• Opens: coolant

📋 Procedure

1. Disconnect earth cable from battery with ignition switched off .
2. Remove wiper arms .
3. Pull off seal (1) in vicinity of plenum chamber cover.
4. ⚠ Risk of damage to plenum chamber cover.Apply a small quantity of soap solution to transition between windscreen and plenum chamber cover. — Starting at edge of windscreen, carefully pull plenum chamber cover (2) vertically up and out of retainer at windscreen (arrows).
5. Disengage plenum chamber cover from outer plenum chamber covers (3); raise cover at centre and disengage from guides (4) to the side.

6. Release cover (2) and swivel to the side (arrow).
7. Detach positive cable (4).
8. Remove nut (3) from positive cable (1).
9. Press positive cable (1) off stud.
10. Release retaining tabs (1) and (3) and swivel remote positive terminal (2) out of mounting.
11. Drain off coolant 19Cooling system/coolant; Draining and filling cooling system.
12. Remove tensioner for poly V-belt 13Cylinder block (pulley end); Removing and installing tensioner for poly V-belt.
13. Unscrew bolts (arrows) for alternator approx. 6 turns.
14. Tap carefully on bolt heads with a hammer to release sliding bushes securing alternator.
15. Remove bolts completely.
16. If fitted, remove silencer for auxiliary heater Auxiliary, supplementary heater82Auxiliary/supplementary heater; Removing and installing silencer with bracket.
17. Pull air intake grille (1) off bumper cover (arrow).
18. Release catch (arrow) and open cover (4).
19. Disconnect electrical wiring (1) and (2).
20. Remove bolt (3).
21. Slide fuse holder (front end) upwards and detach from lock carrier.
22. Move clear electrical wiring.
23. Remove bolts (1) and detach deflector plate to front (arrow).
24. Move fluid hose (3) and electrical wiring (4) clear.
25. Remove bolts (1, 2, 5) and detach lower longitudinal member (right-side).
26. Remove bolt (4) for positive cable (3) and bolt (2) for earth cable (1) and move clear electrical wiring.
27. Unplug electrical connector (3) at oil level and oil temperature sender G266.
28. Remove bolt (1) at wire retainer (2).
29. Move clear electrical wiring (2) at coolant hoses.
30. Release hose clips (arrows A) and pull off coolant hoses (3) and (4).
31. Release hose clip (arrow B) and pull coolant hose (1) off alternator.
32. Move alternator (4) as far as possible towards front.
33. Unscrew nut (2) and detach B+ wire (3).
34. Unplug electrical connector (1).
35. Take out alternator towards right. [Note: Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.Stiff alternator mount bushes must be freed; otherwise the clamping force of the bush will not be adequate even when the bolts are tightened to the correct torque.]
36. To facilitate positioning of alternator, drive back sliding bushes for securing bolts slightly.
37. Connect battery. Steps required .
38. Start engine and check that belt runs properly.

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