Cylinder Head Overview
Cylinder Head Overview
• 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 sequence when loosening, refer to => [ Loosening the Cylinder Head ]
• Observe sequence for 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 ]
6 Cylinder Head Bolt
• Replace
• Follow the sequence when loosening, refer to => [ Loosening the Cylinder Head ]
• Observe sequence for tightening, refer to => [ Cylinder Head Tightening Sequence ]
7 O-ring
• Replace
• Lubricate with engine oil
8 Plug
• 5 Nm
• With ball head for the engine cover
9 Cover
• With gasket
10 O-ring
• Replace
• Lubricate with engine oil
11 Plug
12 Bracket
13 Bolt
• 9 Nm
14 Heat Shield
15 Bolt
• 20 Nm
16 Bolt
• 20 Nm
17 To the Intake Manifold/Turbocharger
18 Ventilation Pipe
19 O-ring
• No replacement part
20 Gasket
• No replacement part
21 Engine Cover
22 Bolt
• Tightening sequence, refer to => [ Crankcase Ventilation, Tightening Sequence ]
23 Crankcase Ventilation
• Observe sequence for tightening, refer to => [ Crankcase Ventilation, Tightening Sequence ]
24 To the Intake Manifold
25 Gasket
• No replacement part
26 Gasket
• Replace if damaged
27 Vacuum Pump
28 Bolt
29 Retaining Plate
30 Bolt
• 9 Nm
31 Connecting Piece
32 O-ring
• Replace
• Coat with coolant
33 Engine Lifting Eye
34 Bolt
• 25 Nm
35 Bolt
• 9 Nm
36 Camshaft Position (CMP) Sensor (G40)
37 O-ring
• Replace
• Lubricate with engine oil
38 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 - 1 to 10 - sequence.
Loosening the Cylinder Head
- Remove the bolts - arrows -.
- Loosen the cylinder head bolts in sequence - 1 to 5 -
Cylinder Head Tightening Sequence
- Tighten the cylinder head bolts in sequence - 1 to 5 -.
- 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.
Checking Cylinder Head for Distortion
- Check the cylinder head in several places for distortion using a straight edge and a feeler gauge.
• Maximum permissible distortion: 0.05 mm.