Renewing sealing flange - vehicles from VIN 8P_4_103001 onwards — AUDI

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

• Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

• The sealing flange is pressed off the crankshaft together with the sender wheel.
• The sender wheel must not be taken out of the sealing flange or rotated out of position.
• Ensure the sealing flange lies flat on the assembly tool.
• Ensure that the sender wheel remains fixed on the assembly tool when installing the sealing flange.
• The guide pin for diesel engines (black handle) (D) must not be inserted into threaded hole in crankshaft.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📐 22 workshop diagrams for BAG

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Remove the flywheel or the drive plate .
2. Remove intermediate plate (arrows).
3. Rotate engine to TDC Checking valve timing.
4. Remove sump .
5. Remove engine speed sender G28(arrow).

6. Unscrew securing bolts for sealing flange. [Note: The sealing flange is pressed off the crankshaft together with the sender wheel.]
7. To press out, screw in 3 bolts M6x35 (arrows) alternately into sealing flange not more than 1/2 turn at a time.
8. Remove sealing flange together with sender wheel. [Note: The sealing flange with PTFE oil seal is fitted with a sealing lip support ring. This support ring acts as an assembly sleeve and must not be removed before installation. Sealing flange and sender wheel must not be separated or rotated out of position after removal from packaging.The sender wheel is held in its installation position by a locating pin on the assembly tool T10134.The sealing flange and oil seal are one unit and can only be replaced together with the sender wheel.The assembly tool T10134 is held in the correct position relative to the crankshaft by a guide pin which is inserted into a hole in the crankshaft.]
9. Screw hexagon nut (B) to shortly before the tightening flats (A) on the threaded spindle.
10. Clamp assembly tool T10134 in a vice on tightening flats (A) of threaded spindle.
11. Press the assembly housing (C) downwards so that it lies on the hexagon nut (B)(arrow).
12. Remove the securing clip (arrow) from new sealing flange. [Note: The sender wheel must not be taken out of the sealing flange or rotated out of position.]
13. Place the sealing flange (with the front side downwards) on a clean flat surface.
14. Press the sealing lip support ring (A) downwards in direction of (arrows) until it lies against the flat surface.
15. Place front side of sealing flange on assembly tool T10134, so that locating pin (B) can be inserted in hole (A) in sender wheel. [Note: Ensure the sealing flange lies flat on the assembly tool.]
16. Press the sealing flange and sealing lip support ring (B) onto the surface of the assembly tool T10134 while tightening the 3 knurled screws (A) so that the locating pin will not slip out of the hole in the sender wheel. [Note: Ensure that the sender wheel remains fixed on the assembly tool when installing the sealing flange.]
17. Screw hexagon nut (B) to end of threaded spindle.
18. Press the threaded spindle of assembly tool T10134 in direction of (arrow) until the hexagon nut (B) lies on the assembly housing (A).
19. Position flat edge of assembly housing towards sealing surface for sump on cylinder block.
20. Secure assembly tool T10134 to crankshaft flange by screwing hexagon socket head bolts (A) approx. 5 threads into crankshaft flange.
21. Screw two bolts M6×35 mm (item A) into cylinder block to guide sealing flange.
22. Press the assembly housing (C) by hand in the direction of the (arrow) until the sealing lip support ring (B) lies on the surface of the crankshaft flange (A).
23. Press the guide pin for petrol engines (red handle) (F) into aperture in crankshaft. This ensures that the sender wheel reaches its final installation position. [Note: The guide pin for diesel engines (black handle) (D) must not be inserted into threaded hole in crankshaft.]
24. Tighten the 2 hexagon socket head bolts on assembly tool finger-tight.
25. Screw hexagon nut (E) onto threaded spindle by hand until it lies against the assembly housing (C).
26. Tighten hexagon nut of assembly tool T10134 to 35 Nm. [Note: A small air gap must be present between cylinder block and sealing flange after tightening hexagon nut to 35 Nm.] — 35 Nm (26 lb-ft)
27. Screw hexagon nut (E) to end of threaded spindle.
28. Unscrew the 2 bolts (A) out of cylinder block.
29. Unscrew the 3 knurled screws (B) from sealing flange.
30. Remove assembly tool T10134.
31. Remove sealing lip support ring.
32. Apply a depth gauge on the crankshaft flange.
33. Measure distance between crankshaft flange and sender wheel.
34. Press in the sender wheel further .
35. Continue with assembly .
36. Secure assembly tool T10134 to crankshaft flange by tightening hexagon socket head bolts (A) hand-tight.
37. Press the assembly tool T10134 towards the sealing flange by hand.
38. Screw hexagon nut (E) onto threaded spindle by hand until it lies against the assembly housing (C).
39. Tighten hexagon nut of assembly tool T10134 to 40 Nm. — 40 Nm (30 lb-ft)
40. Check installation position of sender wheel on crankshaft again .
41. Tighten hexagon nut of assembly tool T10134 to 45 Nm. — 45 Nm (33 lb-ft)
42. Check installation position of sender wheel on crankshaft again .
43. Tighten the new securing bolts for sealing flange in diagonal sequence.
44. Secure engine speed sender G28(arrow).
45. Install sump .
46. Engage intermediate plate on sealing flange and slip onto dowel sleeves.
47. Install the flywheel or the drive plate .

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