Installing a new balance shaft assembly: Audi A3 (AVB, AVF, AWX, BKE, …)

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

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

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• If it is not possible to align the elongated holes in the balance shaft gear with the threaded holes, you must turn the gear some teeth further as required and then fit it again.
• The following three steps have to be performed simultaneously (a second mechanic is therefore required):
• After installation the idler gear must have no backlash. This can be checked by exerting light pressure by hand.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Thrust washer can slip out of position behind idler gear. Before positioning balance shaft assembly, slacken off bolt for idler gear as specified below, but not further. Installation position of thrust washer — Loosen bolt (1) for idler gear approx. 45° using e.g. bits T10099 and insert tool, 14 mm T10393.
2. If not already fitted, fit dowel sleeves into cylinder block for centring balance shaft assembly.
3. Attach balance shaft assembly to cylinder block.
4. Balance shaft assembly with eight attachment points: Tighten bolts for balance shaft assembly (see the separate procedure).
5. Balance shaft assembly with six attachment points: Tighten bolts for balance shaft assembly (see the separate procedure).

6. Lock balance shaft with locking tool T10255, turning balance shaft as required.
7. Carefully fit balance shaft gear onto balance shaft; to do so, push idler gear slightly to one side. [Note: If it is not possible to align the elongated holes in the balance shaft gear with the threaded holes, you must turn the gear some teeth further as required and then fit it again.]
8. Tighten bolts (arrows) for balance shaft gear.
9. Remove locking tool T10255. [Note: The following three steps have to be performed simultaneously (a second mechanic is therefore required):]
10. Push idler gear (3) firmly in direction of (arrow) into teeth on spur gear (2) and balance shaft gear (1). If necessary use a wooden rod to do so.
11. At the same time, turn balance shaft gear slightly anti-clockwise.
12. Tighten bolt securing idler gear.
13. Remove crankshaft stop T10050. [Note: After installation the idler gear must have no backlash. This can be checked by exerting light pressure by hand.]
14. Install sump (see the separate procedure).
15. Top up engine oil and check oil level 808.
16. Install vibration damper (see the separate procedure).

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