Cylinder Head Assembly Overview

Cylinder Head Assembly Overview

• Cylinder head for bank 2 (left) is shown in illustration.





1 Cylinder head gasket

• Replacing, refer to --> [ Cylinder Head ] Cylinder Head.

• Installation position: Part number points to cylinder head.

• Replace coolant after replacing. Refer to --> [ Cooling System, Draining and Filling ] Procedures.

2 Cylinder head

• Removing and installing. Refer to --> [ Cylinder Head ] Cylinder Head.

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

• Reworking dimension, refer to --> [ Cylinder Head Reworking Dimension ]

• Replace coolant after replacing. Refer to --> [ Cooling System, Draining and Filling ] Procedures.

3 Cylinder head cover gasket

• Replace if damaged or leaking.

4 Cylinder head cover

• Removing and installing: Left, refer to --> [ Left Cylinder Head Cover ] Left Cylinder Head Cover and right, refer to --> [ Right Cylinder Head Cover ] Right Cylinder Head Cover.

5 Gasket

• For cap

• Replace if damaged or leaking.

6 Cap

7 Ignition coil with power output stage ((N70, N127, N291, N292, N323, N324, N325, N326))

• Only remove and install with puller (T40039). Refer to --> [ Ignition Coils with Power Output Stage ] Service and Repair.

8 Special bolt - 9 Nm

• Replace if seal is damaged.

• Note tightening sequence, refer to --> [ Tighten cylinder head cover bolts in sequence to 9 Nm. ] Left Cylinder Head Cover.

9 Camshaft adjustment valve 2 (N208)

10 2.4 Nm

11 O-ring

• Replace

12 Seal

• Replace

13 Locking bolt - 35 Nm

14 2.4 Nm

15 camshaft adjustment valve 2 (exhaust) (N319)

16 O-ring

• Replace

17 Cylinder head bolt

• Replace

• Observe sequence for loosening, refer to --> [ Loosen cylinder head bolts using the in sequence. ] Cylinder Head.

• Note tightening sequence, refer to --> [ Tighten cylinder head bolts in 4 stages in sequence as follows: ] Cylinder Head.

Checking Cylinder Head for Distortion





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

• Max. permissible distortion: 0.1 mm.

Cylinder Head Reworking Dimension





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

• Minimum dimension: - a - = 139.5 mm.