Cylinder Head Overview With AVS
Cylinder Head Overview with AVS
• Replace the cylinder head bolts.
• Always replace self-locking nuts, bolts which have been tightened to tightening specifications as well as gaskets and O-rings.
• The plastic protectors installed to protect the open valves must only be removed immediately before fitting the cylinder head.
• It is necessary to replace all the coolant and engine oil whenever the cylinder head or the cylinder head gasket are replaced.
1 Cylinder Head Gasket
• Replace
• Note installation position: Parts number to cylinder head
2 Bolt
• 25 Nm
3 Engine Lifting Eye
4 Bolt
• Replace
• Follow the procedure when loosening. Refer to => [ Loosening the Cylinder Head ].
• Follow the procedure when tightening. Refer to => [ Cylinder Head Tightening Sequence ].
5 Cylinder Head
• Removing and installing, refer to => [ Cylinder Head ] Cylinder Head
• Check for distortion, refer to => [ Checking Cylinder Head for Distortion ] Cylinder Head Overview
6 Cylinder Head Bolt
• Replace
• Follow the procedure when loosening. Refer to => [ Loosening the Cylinder Head ].
• Follow the procedure when tightening. Refer to => [ Cylinder Head Tightening Sequence ].
7 O-ring
• Replace
• Coat with engine oil
8 Camshaft Adjuster Actuator
9 Bolt
• 5 Nm
10 O-ring
• Replace
• Lubricate with engine oil
11 Plug
• 5 Nm
• With ball head for the engine cover
12 Cover
• With gasket
13 O-ring
• Replace
• Lubricate with engine oil
14 Plug
15 Bracket
16 Bolt
• 9 Nm
17 Heat Shield
18 Bolt
• 20 Nm
19 Bolt
• 20 Nm
20 To the Intake Manifold/Turbocharger
21 Ventilation Pipe
22 O-ring
• No replacement part
23 Gasket
• No replacement part
24 Engine Cover
25 Bolt
• Tightening sequence, refer to => [ Crankcase Ventilation, Tightening Sequence ]
26 Crankcase Ventilation
27 To the Intake Manifold
28 Gasket
• No replacement part
29 Gasket
• Replace if damaged
30 Vacuum Pump
31 Bolt
32 Retaining Plate
33 Bolt
• 9 Nm
34 Connecting Piece
35 O-ring
• Replace
• Coat with coolant
36 Engine Lifting Eye
37 Bolt
• 25 Nm
38 Bolt
• 9 Nm
39 Camshaft Position (CMP) Sensor (G40)
40 O-ring
• Replace
• Lubricate with engine oil
41 Partition Plate
Crankcase Ventilation, Tightening Sequence
• The bolts are self-tapping. Only use original bolts when replacing the cylinder head, since the cylinder head is delivered without a thread for the installing the crankcase ventilation.
• It is not permitted to cut the thread with a thread cutter.
- Tighten the crankcase ventilation bolts to 11 Nm in sequence - 1 to 10 -.
Checking Cylinder Head for Distortion
- Check the cylinder head in several places for distortion using a straight edge and a feeler gauge.
• Max. permissible distortion: 0.05 mm
Loosening the Cylinder Head
- Remove the bolts - arrows -.
- Loosen the cylinder head bolts in sequence - 1 to 10 -.
Cylinder Head Tightening Sequence
- Tighten the cylinder head bolts in - 1 to 10 - sequence.
- Tighten to 40 Nm using a torque wrench.
- Tighten further 90° using a rigid wrench.
- Tighten further 90° using a rigid wrench.
- Tighten the bolts - arrows - to 8 Nm.
- Tighten the bolts - arrows - 90° further using a rigid wrench.