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Removing and installing cylinder head, engine codes BZB, CAWB, CBFA, CCTA, CDAA, CCZA > < Removing and installing cylinder head, engine codes BYT, BPU

A3 Mk2

Cylinder head, engine codes BZB, CAWB, CBFA, CCTA, CDAA, CCZA - exploded view
Cylinder head, engine codes BZB, CAWB, CBFA, CCTA, CDAA, CCZA - 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 the coolant in the entire cooling system.
   
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 → Fig.
q   Note correct sequence when tightening → 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 - Bracket
13 - Bolt
q   9 Nm
14 - Heat shield
15 - Bolt
q   20 Nm
16 - Bolt
q   20 Nm
17 - To intake manifold/turbocharger
18 - Breather pipe
19 - O-ring
q   No replacement part available
20 - Seal
q   No replacement part available
21 - Engine cover panel
22 - Bolt
q   Tightening sequence → Fig.
23 - Crankcase breather
q   Note correct sequence when tightening → Fig.
24 - To intake manifold
25 - Gasket
q   No replacement part available
26 - Gasket
q   Renew if damaged
27 - Exhauster pump
q   Removing and installing → Rep. Gr.47
28 - Bolt
q   Tightening torque → Rep. Gr.47
29 - 9 Nm
q   Engine code CBFA only
30 - Secondary air inlet valve -N112-
q   Engine code CBFA only
31 - Gasket
q   Engine code CBFA only
q   Renew
32 - Bracket
33 - Bolt
q   9 Nm
34 - Connection
35 - O-ring
q   Renew
q   Lubricate with coolant
36 - Bolt
q   25 Nm
37 - Transport plate
38 - Bolt
q   9 Nm
39 - Hall sender -G40-
40 - 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
–  Remove bolts -arrows-.
–  Slacken cylinder head bolts in the sequence -1 ... 5-.
  A15-10474
Tightening sequence for cylinder head
–  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, engine codes BZB, CAWB, CBFA, CCTA, CDAA, CCZA > < Removing and installing cylinder head, engine codes BYT, BPU