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Removing and installing cylinder head (1.8 ltr. engine) > < Cylinder head

A4 Mk3

Cylinder head (1.8 ltr. engine) - exploded view
Cylinder head (1.8 ltr. engine) - exploded view
  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   Tightening sequence → Fig.
5 - Cylinder head
q   Removing and installing → Chapter
q   Checking for distortion → Fig.
6 - Cylinder head bolt
q   Renew
q   Note correct sequence when loosening (1.8 ltr. engine) → Fig.
q   Note correct sequence when tightening (1.8 ltr. engine) → Fig.
7 - O-ring
q   Renew
q   Lubricate with engine oil
8 - Sealing plug
q   5 Nm
q   With ball head for engine cover panel
9 - Filler cap
q   With seal
10 - O-ring
q   Renew
q   Lubricate with engine oil
11 - Sealing plug
12 - To intake manifold
13 - Heat shield
14 - Bolt
q   20 Nm
15 - Bolt
q   20 Nm
16 - To intake manifold/turbocharger
17 - Breather pipe
18 - O-ring
q   Not available as replacement part
19 - Seal
q   Not available as replacement part
20 - Engine cover panel
21 - Bolt
q   Tightening sequence → Fig.
22 - Crankcase breather
q   Note correct sequence when tightening → Fig.
23 - Gasket
q   Not available as replacement part
24 - Gasket
q   Renew if damaged
25 - Vacuum pump
q   Removing and installing → Rep. gr.47
26 - Bolt
q   Tightening torque → Rep. gr.47
27 - Connection
28 - Bracket
29 - Bolt
q   9 Nm
30 - O-ring
q   Renew
q   Lubricate with coolant
31 - Transport plate
32 - Bolt
q   25 Nm
33 - Bolt
q   9 Nm
34 - Hall sender -G40-
35 - Separating plate

   
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
Slackening cylinder head bolts (1.8 ltr. engine)
–  Remove bolts -arrows-.
–  Slacken cylinder head bolts in the sequence -1 ... 5-.
  A15-10474
Cylinder head bolts - tightening sequence (1.8 ltr. engine)
–  Tighten cylinder head bolts in the sequence -1 ... 5- as follows:
1.  Tighten with torque wrench initially to 40 Nm.
2.  Use rigid wrench to turn 90° further.
3.  Use rigid wrench to turn 90° further.
4.  Pre-tighten bolts -arrows- to 8 Nm.
5.  Turn bolts -arrows- 90° further using a rigid wrench.
  A15-10475
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 (1.8 ltr. engine) > < Cylinder head