Cylinder Head Assembly Overview

Cylinder Head Assembly 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.

• When installing a replacement cylinder head with camshafts installed, contact surfaces between roller rocker lever and cam running surfaces must be oiled.

• The plastic protectors installed to protect the open valves must only be removed immediately before fitting the cylinder head.

• When replacing the cylinder head or cylinder head gasket, coolant must be completely replaced.






1 Bolt

• Tightening sequence, refer to => [ Cylinder Head Cover Tightening Sequence ]

2 Cylinder Head Cover

• Removing and installing, refer to => [ Cylinder Head Cover ] Service and Repair

• Tightening sequence, refer to => [ Cylinder Head Cover Tightening Sequence ]

3 Gasket

• Replace if damaged or leaking

4 Valve Housing

5 Oil Filler Cap

6 Gasket

• Replace if damaged or leaking

7 Bolt

• 4 Nm

8 Cylinder Head Cover Gasket

• Replace if damaged or leaking

9 Vacuum Pump

10 Bolt

• 4 Nm

11 Camshaft Adjustment Valve 1 (N205)

• Removing, refer to => [ Camshaft Adjustment Valve 1 ] Camshaft Adjustment Valve 1

12 Seal

• Replace

13 Bolt

• 10 Nm

14 Cable Bracket

15 Seal

• Replace if damaged or leaking

16 Bolt

• 10 Nm

17 Housing

18 Gasket

• Replace

19 Transport Strap

20 Bolt

• 25 Nm

21 Intake Manifold Stud Bolt

• 10 Nm

22 Partition Plate

23 Cylinder Head Gasket

• Replace

• Note installation position: The part number faces the cylinder head

• Replace coolant after replacing

24 Bolt

• 10 Nm

25 Camshaft Position Sensor (G40)

26 Seal

27 Tensioning Roller Stud Bolt

• 10 Nm

28 Exhaust Manifold Stud Bolt

• 20 Nm

29 Cylinder Head

• Check for distortion, refer to => [ Checking Cylinder Head for Distortion ]

30 Cylinder Head Bolt

• Replace

• Observe sequence for loosening, refer to => [ Loosening the Cylinder Head ]

• Follow the tightening sequence, refer to => [ Cylinder Head Tightening Sequence ]

Cylinder Head Cover Tightening Sequence





- Install bolts - 1 through 14 - and tighten by hand.

- Tighten the bolts - 1 through 14 - diagonally to 10 Nm.

Loosening the Cylinder Head





- Loosen cylinder head bolts in sequence shown and remove.

Cylinder Head Tightening Sequence





- Tighten cylinder head bolts in - 1 through 10 - sequence as follows.

- 1. Tighten to 40 Nm using a torque wrench.

- 2. Tighten further 90° using a rigid wrench.

- 3. Tighten further 90° using a rigid wrench.

Checking Cylinder Head for Distortion





- Check cylinder head at multiple points for distortion, using straight edge and feeler gauges.

• Maximum permissible distortion: 0.05 mm.