Cylinder Head Assembly Overview, Engine Code CBFA
Cylinder Head Assembly Overview, Engine Code CBFA
• Always replace the cylinder head bolts.
• Always replace self locking nuts, bolts which have been tightened to specifications as well as gaskets and O-rings.
• The plastic protectors installed to protect the open valves must only be removed immediately before installing the cylinder head.
• When replacing the cylinder head or cylinder head gasket, the coolant must be completely replaced.
1 Cylinder Head Gasket
• Always replace.
• Note the installed position: The part number faces the cylinder head.
2 Bolt, 25 Nm
3 Transport Strap
4 Bolt
• Observe the sequence for loosening, refer to --> [ Cylinder Head Bolt Loosening Sequence ].
• Always replace.
• Tightening sequence and specification, refer to --> [ Cylinder Head Bolt Tightening Sequence and Specification ].
5 Cylinder Head
• Checking for distortion, refer to --> [ Checking Cylinder Head for Distortion ].
• Removing and installing, refer to --> [ Cylinder Head ] Cylinder Head.
• Checking compression, refer to --> [ Compression, Checking ] Testing and Inspection.
6 Cylinder Head Bolt
• Observe the sequence for loosening, refer to --> [ Cylinder Head Bolt Loosening Sequence ].
• Always replace.
• Tightening sequence and specification, refer to --> [ Cylinder Head Bolt Tightening Sequence and Specification ].
7 O-ring
• Always replace.
• Lubricate with engine oil.
8 Sealing Plug, 5 Nm
• With a ball head for the engine cover.
9 Oil Fill Cap
• With gasket.
10 O-ring
• Always replace.
• Lubricate with engine oil.
11 Sealing Plug
12 to Intake Manifold
13 to Intake Manifold/Turbocharger
14 Ventilation Pipe
15 O-ring
• No replacement part.
16 Gasket
• No replacement part.
17 Crankcase Ventilation
18 Engine Cover
• Removing and installing, refer to --> [ Engine Cover ] Engine Cover.
19 Bolt
• Always replace.
• Tightening sequence and specification, refer to --> [ Crankcase Ventilation Bolt Tightening Sequence and Specification ].
20 Gasket
• No replacement part.
21 Gasket
• Replace if damaged.
22 Vacuum Pump
• Removing and installing, refer to --> [ Vacuum Pump ] Vacuum Pump.
23 Bolt, 9 Nm
24 Bolt, 9 Nm
25 Secondary Air Injection (AIR) Solenoid Valve (N112)
26 Gasket
• Always replace.
27 Mounting Plate
28 Bolt, 9 Nm
29 Connecting Piece
30 O-ring
• Always replace.
• Lubricate with coolant.
31 Transport Strap
32 Bolt, 25 Nm
33 Bolt, 9 Nm
34 Camshaft Position (CMP) Sensor (G40)
35 Partition Plate
Crankcase Ventilation Bolt Tightening Sequence and Specification
Special tools, testers and auxiliary items required
• Torque wrench 5-50 Nm (VAG 1331)
- Tighten the crankcase ventilation bolts in the sequence - 1 through 10 - shown to 11 Nm.
Cylinder Head Bolt Loosening Sequence
- Remove the bolts - arrows -.
- Loosen the cylinder head bolts in the sequence - 1 through 5 - shown.
Cylinder Head Bolt Tightening Sequence and Specification
Special tools, testers and auxiliary items required
• Torque wrench 5-50 Nm (VAG 1331)
- Tighten the new cylinder head bolts in 3 passes in sequence - 1 through 5 - as follows:
- Tighten the bolts to 40 Nm.
- Using a TORX(R) bit, tighten an additional 90° (1/4 turn).
- Using a TORX(R) bit, tighten an additional 90° (1/4 turn).
- Tighten the new bolts - arrows - to 8 Nm.
- Tighten the bolts - arrows - using a TORX(R) bit an additional 90° (1/4).
• There is no requirement to retighten the cylinder head bolts after repairs.
Checking Cylinder Head for Distortion
Special tools, testers and auxiliary items required
• Feeler gauge
• Straight edge
- Check the cylinder head for distortion using a straight edge and feeler gauge in several places.
• Max. permissible distortion: 0.05 mm