Audi Workshop Service and Repair Manuals

Toothed belt drive - exploded view, engine code AXW, BMB, BHD

Mark the rotation direction of the toothed belt with chalk or felt-tip pen before removing. If the belt runs in the opposite direction when it is refitted, this can cause breakage.

1 -	Toothed belt cover (bottom)

q	Unbolt crankshaft pulley to remove

2 -

10 Nm

q	Apply locking fluid when fitting

q	Locking fluid → Parts catalogue

3 -	Toothed belt cover (centre)

4 -	Engine support

q	Removing ⇒ Removing and installing toothed belt → Chapter

5 -

45 Nm

q	Observe correct tightening sequence → Fig.

6 -	Toothed belt cover (top)

q	Removing and installing → Fig.

7 -

10 Nm

q	Apply locking fluid when fitting

q	Locking fluid → Parts catalogue

8 -	Toothed belt

q	Before removing, mark direction of rotation with chalk or felt-tip pen

q	Check for wear

q	Removing → Chapter

q	Installing (adjusting valve timing) → Chapter

9 -

25 Nm

10 -

Washer

11 -	Tensioning roller

q	Installation position → Fig.

12 -	50 Nm + turn 180° further

q

Renew

q	Use counterhold 3036 when loosening and tightening → Fig.

13 -	Camshaft sprocket

q	Remove toothed belt prior to removing and installing → Chapter

q	Installation position fixed by Woodruff key → Item

q	Detaching camshaft sprocket → Fig.

14 -

23 Nm

q	Apply locking fluid when fitting

q	Locking fluid → Parts catalogue

15 -	Woodruff key

q	Check for firm attachment

16 -

Camshaft

17 -	Toothed belt cover (rear)

18 -	Retaining plate for tensioning roller

q	Observe correct tightening sequence → Fig.

19 -

40 Nm

20 -	Idler roller

21 -

9 Nm

22 -	Coolant pump

q	Removing and installing → Chapter

23 -

O-ring

q

Renew

24 -

15 Nm

25 -	Retaining plate

q	Tightening sequence → Fig.

26 -	Crankshaft sprocket

q	Contact surface between sprocket and crankshaft must be free of oil

q	Can only be installed in one position

27 -	90 Nm + 90° (1/4 turn) further

q

Renew

q	Do not lubricate with oil

q	Use counterhold 3415 when slackening off and tightening

q	Attaching counterhold tool 3415 → Fig.

28 -	Damper wheel

29 -

25 Nm

Removing and installing toothed belt cover (top) –  Remove the bolts -arrows- and lift off toothed belt cover. –  Engage carefully in toothed belt cover (centre) when installing.

Loosening camshaft sprocket –  Use counterhold 3036 to loosen and tighten the central bolt.

Detaching camshaft sprocket –  Use two-arm puller -T40001- with claws T400001/6 and T400001/7 to detach camshaft sprocket.

Installation position of toothed belt tensioning roller Retaining lug -arrow- must engage in slot on cylinder head.

Tightening sequence for retaining plate –  Tighten retaining plate bolts to 9 Nm in the sequence -1 ... 5-.

Tightening sequence for retaining plate –  First tighten bolts -1- to 40 Nm. –  Then tighten bolt -2- to 15 Nm.

Removing and installing crankshaft sprocket –  Use counterhold 3415 to loosen and tighten the central bolt.

Installing engine support –  Initially screw bolts -arrows- in hand-tight. –  Then tighten bolts -arrows- to 45 Nm.