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Removing and installing cylinder head > < Renewing injector seals

A3 Mk2

Cylinder head - exploded view
   
Cylinder head - exploded view
1 - Cylinder head gasket
q   Renewing → Chapter „Removing and installing cylinder head“
q   Identification of cylinder head gasket → Fig.
q   If renewed, change coolant and engine oil
2 - Bolt
q   Apply locking fluid when installing; refer to → Electronic parts catalogue
q   10 Nm
3 - Hall sender -G40-
q   For camshaft position
4 - Cylinder head
q   Removing and installing → Chapter
q   To prevent damage to glow plugs, always place cylinder head on a soft foam surface after removal.
q   Checking for distortion → Fig.
q   Must not be machined
q   Before installing, check that the two dowel sleeves for centring cylinder head are fitted on cylinder block
q   If renewed, change coolant and engine oil
5 - Washer
6 - Bolt
q   Renew
q   Correct sequence when slackening → Anchor
q   Tightening torque and sequence → Fig.
7 - Oil pressure switch -F1-
q   Opening/closing pressure 0.3 ... 0.6 bar
q   Removing and installing → Chapter
q   Checking → Chapter
q   20 Nm
8 - Seal
q   Renew
9 - Bolt
q   20 Nm
10 - Engine lifting eye
11 - Seal
q   Renew
12 - Screw plug
q   20 Nm
13 - Gasket
q   Renew
14 - Vacuum pump
q   Removing and installing → Rep. gr.47
15 - Bolt
q   Tightening torque → Rep. gr.47
16 - Connection
q   For coolant hoses
q   with coolant temperature sender -G62-
17 - Bolt
q   Tightening torque → Item
18 - Seal
q   Renew
19 - Bolt
q   20 Nm
20 - Engine lifting eye

   
Checking cylinder head for distortion
–  Use straight edge 500 mm -VAS 6075- and feeler gauge to measure cylinder head for distortion at several points.
l  Max. permissible distortion: 0.1 mm.
  Note
Cylinder heads must not be reworked on TDI engines.
  A15-10931
Identification of cylinder head gasket
1 - Part number
2 - Holes
3 - Ignore
  Note
Cylinder head gaskets of different thicknesses are fitted depending on the amount of piston projection → Chapter. When renewing only the cylinder head gasket, the new gasket should have the same identification as the old one.
  A15-10508
Cylinder head - tightening torque and sequence
  Note
Renew the bolts tightened with specified tightening angle.
–  Tighten bolts in 4 stages in the sequence shown:
  V15-0738
StageBoltsTightening torque/angle specification
1.-1 … 10-30 Nm
2.-1 … 10-50 Nm
3.-1 … 10-turn 90° further
4.-1 … 10-turn 90° further

   

Removing and installing cylinder head > < Renewing injector seals