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Removing and installing drive chain for valve gear > < Detaching timing chains from camshafts, removing and installing chain tensioners

A4 Mk2

Drive chain for valve gear - exploded view of components
   
Drive chain for valve gear - exploded view of components
1 - Bearing mounting for drive sprocket
2 - 30 Nm + 90° (1/4 turn) further
q   Renew
3 - Bolt
q   Renew
q   Types and tightening torque differ depending on version → Fig.
4 - 6 Nm + 60° (1/6 turn) further
q   Renew
5 - Thrust washer for drive sprocket
6 - Bush
q   Depending on version → Fig.
7 - Drive chain sprocket for camshaft timing chain (left-side)
8 - Bolt
q   Renew
q   Types and tightening torque differ depending on version → Fig.
9 - Drive chain for valve gear
q   Before removing, mark running direction with paint
10 - Guide rail
11 - Bolt
q   Renew
q   Types and tightening torque differ depending on version → Fig.
12 - Bush
q   Depending on version → Fig.
13 - 8 Nm + 45° (1/8 turn) further
q   Renew
q   Lubricate with oil before installing
14 - Bearing bracket for drive sprocket
15 - Bush
q   Depending on version → Fig.
16 - Thrust washer
17 - Drive chain sprocket for camshaft timing chain (right-side)
18 - Bush
q   Depending on version → Fig.
19 - Bolt
q   Renew
q   Types and tightening torque differ depending on version → Fig.
20 - O-ring
q   Renew
21 - Chain tensioner
22 - 6 Nm + 45° (1/8 turn) further
q   Renew
23 - Guide rail for chain tensioner
24 - Crankshaft
25 - Bush
q   Depending on version → Fig.
26 - Guide rail
q   Note installation position
27 - Bolt
q   Renew
q   Types and tightening torque differ depending on version → Fig.

   
Different types of bolts securing guide rails
Depending on version, different bolt types are used when securing the timing chain guide rails:
  A13-10518
1 -Bolt with shaft
t  Renew
t  10 Nm + 30° (1/12 turn) further
2 -Bolt with bush -6- with collar
t  Renew
t  10 Nm + 90° (1/4 turn) further
3 -Bolt with bush -4- and washer -5-
t  Renew
t  10 Nm + 90° (1/4 turn) further

   

Removing and installing drive chain for valve gear > < Detaching timing chains from camshafts, removing and installing chain tensioners