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Removing and installing drive chain for balance shaft > < Removing and installing camshaft timing chain

A4 Mk3

Drive chain for balance shafts - exploded view
   
Drive chain for balance shafts - exploded view
1 - Guide pin
q   20 Nm
2 - Tensioning rail
q   For timing chain
3 - Balance shaft
q   Exhaust side
q   Always renew after removal
q   Lubricate bearing with engine oil
q   Renewing → Chapter
4 - Guide pin
q   20 Nm
5 - Guide rail
q   For timing chain
6 - Chain tensioner
q   65 Nm
7 - Seal
8 - Cylinder block
9 - O-ring
q   Lubricate with engine oil
10 - Bearing mounting
q   Lubricate with engine oil
q   Installation position → Fig.
11 - Idler gear
q   If bolt → Item has been loosened, idler gear must be renewed
12 - Washer
13 - Bolt
q   Renew
q   If bolt has been loosened, idler gear → Item must be renewed
q   Tightening sequence → Fig.
14 - Guide rail
q   For balance shaft timing chain
15 - Guide pin
q   20 Nm
16 - Balance shaft
q   Inlet side
q   Always renew after removal
q   Lubricate bearing with engine oil
q   Renewing → Chapter
17 - Chain sprocket
q   Installation position → Fig.
18 - Drive chain for balance shafts
q   Removing → Chapter

   
Bearing mounting - installation position
l  Renew O-ring -1- and lubricate with oil.
l  Dowel pin -arrow- for bearing mounting must engage in bore in cylinder block.
l  Lubricate bearing mounting.
  A15-10466
Idler gear - tightening sequence
  Caution
Always renew idler gear. If this is not done, there is no backlash, which causes engine damage.
The new idler gear has a special lubricant coating which wears off after a short running period and thus automatically creates the specified backlash.
–  Secure with new bolt as follows:
1.  Tighten with torque wrench initially to 10 Nm.
2.  Turn idler gear.
Idler gear must be without play; otherwise loosen bolt and tighten again.
3.  Tighten with torque wrench to 25 Nm.
4.  Use rigid wrench to turn 90° further.
  A15-10464

Removing and installing drive chain for balance shaft > < Removing and installing camshaft timing chain