Cylinder Head Assembly Overview

Cylinder Head Assembly Overview

• Replace cylinder head bolts.

• Always replace self-locking nuts, bolts which have been tightened to tightening torque 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 installing the cylinder head.

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





1 Bolt

• Tightening order => [ Cylinder head cover tightening sequence ]

2 Cylinder head cover

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

3 Gasket

• Replace if damaged or leaking

4 Valve housing

5 Oil filler cap

6 Gasket

• Replace if damaged or leaking

7 4 Nm

8 Cylinder head cover gasket

• Replace if damaged or leaking

9 Vacuum pump

10 4 Nm

11 Camshaft Adjustment Valve 1 (N205)

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

12 Seal

• Replace

13 10 Nm

14 Cable bracket

15 Seal

• Replace if damaged or leaking

16 10 Nm

17 Housing

18 Gasket

• Replace

19 Transport strap

20 25 Nm

21 10 Nm

• Stud bolt for intake manifold

22 Partition plate

23 Cylinder head gasket

• Replace

• Note installation position: Part number facing cylinder head

24 10 Nm

25 Camshaft Position (CMP) sensor (G40)

26 Seal

27 10 Nm

• Stud bolt for tensioning roller

28 20 Nm

• Stud bolt for exhaust manifold

29 Cylinder head bolt

• Replace

• Observe sequence for loosening => [ Loosen cylinder head bolts, paying attention
to sequence of cylinder head bolts. ] Cylinder Head

• Observe sequence for tightening => [ Tighten cylinder head in sequence indicated,
in two stages as follows: ] Cylinder Head

• Torque specification: 40 Nm plus an additional 1/ 2 turn (180°)

Cylinder head cover tightening sequence





- Tighten bolts to 10 Nm in sequence given

Checking cylinder head for distortion





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

• Max. permissible distortion: 0.05 mm

Reworking dimension, cylinder head





- Resurfacing cylinder head (face grinding) is only permissible to minimum dimension a.

• Minimum dimension: a = 139.20 mm