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Removing and installing cylinder head (2.0 ltr. engine with assembly clearance feature) > < Removing and installing cylinder head (1.8 ltr. engine)

A4 Mk3

Cylinder head - exploded view (2.0 ltr. engine with assembly clearance feature)
Cylinder head - exploded view (2.0 ltr. engine with assembly clearance feature)
  Note
t  Renew the cylinder head bolts.
t  During assembly, renew oil seals and gaskets as well as self-locking nuts and bolts that are tightened by turning through to a specified angle.
t  The plastic protectors fitted to protect the open valves must only be removed immediately before fitting the cylinder head.
t  After fitting a new cylinder head or cylinder head gasket, change the engine oil and coolant.
   
1 - Cylinder head gasket
q   Renew
q   Note installation position: part number must face cylinder head
2 - Bolt
q   25 Nm
3 - Transport plate
4 - Bolt
q   Tighten in two stages:
1.  Tighten to 8 Nm.
2.  Use rigid wrench to turn 90° further.
5 - Cylinder head
q   Removing and installing → Chapter
q   Checking for distortion → Fig.
6 - Cylinder head bolt
q   Renew
q   Note procedure when loosening → Anchor
q   Note procedure when tightening → Anchor
q   Tighten in three stages:
1.  Tighten to 40 Nm.
2.  Use rigid wrench to turn 90° further.
3.  Use rigid wrench to turn 90° further.
7 - O-ring
q   Renew
q   Lubricate with engine oil
8 - Actuator for variable valve timing
9 - Bolt
q   5 Nm
10 - O-ring
q   Renew
q   Lubricate with engine oil
11 - Sealing plug
q   5 Nm
q   With ball head for engine cover panel
12 - Filler cap
q   With seal
13 - O-ring
q   Renew
q   Lubricate with engine oil
14 - Sealing plug
15 - To intake manifold
16 - Heat shield
17 - Bolt
q   20 Nm
18 - Bolt
q   20 Nm
19 - To intake manifold/turbocharger
20 - Breather pipe
21 - O-ring
q   Not available as replacement part
22 - Seal
q   Not available as replacement part
23 - Engine cover panel
24 - Bolt
q   Tightening sequence → Fig.
25 - Crankcase breather
26 - Gasket
q   Not available as replacement part
27 - Gasket
q   Renew if damaged
28 - Vacuum pump
q   Removing and installing → Rep. gr.47
29 - Bolt
q   Tightening torque → Rep. gr.47
30 - Connection
31 - Bracket
32 - Bolt
q   9 Nm
33 - O-ring
q   Renew
q   Lubricate with coolant
34 - Transport plate
35 - Bolt
q   25 Nm
36 - Bolt
q   9 Nm
37 - Hall sender -G40-
38 - Separating plate
39 - O-ring
q   Renew
q   Lubricate with engine oil

   
Crankcase breather system - tightening torque
  Note
t  The bolts are thread-forming bolts. When renewing the cylinder head, it is important that you use only genuine bolts since the cylinder head is supplied without threaded holes for attachment of the crankcase breather.
t  Do NOT make threaded holes using a thread tap.
–  Tighten bolts for crankcase breather system in the sequence -1 ... 10- to 11 Nm.
  A15-10605
Checking cylinder head for distortion
–  Use straight edge and feeler gauge to measure cylinder head for distortion at several points.
t  Max. permissible distortion: 0.05 mm
  V15-0654

Removing and installing cylinder head (2.0 ltr. engine with assembly clearance feature) > < Removing and installing cylinder head (1.8 ltr. engine)