Overview - Cylinder Head

Fig 1: Cylinder Head And Cover Overview

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1. Cylinder Head Gasket
   • Replacing, refer to CYLINDER HEAD, REMOVING AND INSTALLING .
   • Installed position: The part number faces toward the cylinder head
   • Change the coolant and engine oil after replacing
2. Cylinder Head
   • Removing and installing, refer to CYLINDER HEAD, REMOVING AND INSTALLING .
   • Check for distortion, refer to Fig 5
   • Reworking dimension, refer to Fig 6
   • Change the coolant and engine oil after replacing
3. O-Ring
   • Replacing
4. Camshaft Position Sensor
   • Cylinder bank 1 (right) Camshaft Position Sensor -G40-
   • Cylinder bank 2 (left) Camshaft Position Sensor 2 -G163-
   • Removing and installing, refer to CAMSHAFT POSITION SENSOR, REMOVING AND INSTALLING .
5. Bolt
   • Tightening specification -item 1- in OVERVIEW - IGNITION SYSTEM .
6. Bolt
   • Replacing
   • Follow the sequence when loosening, refer to Loosen the cylinder head bolts in the sequence -1 to 8-. 
   • Tightening specification and sequence, refer to Fig 4.
7. Ignition Coil
   • Removing and installing, refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .
8. Cylinder Head Cover
   • Removing and installing, refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING  for left side, refer to RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING  for right side.
9. Seal
   • Replace if damaged or leaking
10. Cap
11. Hose
    • For the crankcase ventilation
    • Removing and installing, refer to CRANKCASE VENTILATION HOSES, REMOVING AND INSTALLING .
      CAUTION:

      Risk of violating emissions legislation on USA vehicles.

      • Do not open the hose connection.
12. O-Ring
    • Replacing
13. Bolt
    • Replace if the seal is damaged
    • Tightening specifications and sequence: Left cylinder head cover, refer to Fig 2, right cylinder head cover, refer to Fig 3
14. Bolt
    • Tightening specification, refer to -item 8- in OVERVIEW - IGNITION SYSTEM .
15. Connector Strip
    • For the ignition coils
16. Seal
    • For the cylinder head cover
    • Replace if damaged or leaking
17. Camshaft Adjustment Solenoid Valve
    • Cylinder bank 1 (right) Camshaft Adjustment Valve 1 -N205-
    • Cylinder bank 2 (left) Camshaft Adjustment Valve 2 -N208-
18. Bolt
    • 5 Nm
19. O-Ring
    • Replacing

Fig 2: Identifying Left Cylinder Head Cover Bolt, Tightening Sequence

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-- Tighten the bolts to 9 Nm in the following sequence: -1 to 12-.

Fig 3: Identifying Right Cylinder Head Cover Bolt, Tightening Sequence

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-- Tighten the bolts to 9 Nm in the following sequence: -1 to 12-.

Fig 4: Identifying Cylinder Head Bolts Tightening Sequence

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-- Tighten the bolts in four steps in the sequence shown.

Fig 5: Checking Cylinder Head Distortion

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-- Check the cylinder head at several locations for distortion using a Straight Edge - 500 mm VAS 6075 and a feeler gauge.

• Maximum warp: 0.05 mm

Fig 6: Identifying Cylinder Head Refacing Dimension

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

• Minimum dimension -a- = 139.20 mm.

Fig 7: Identifying Oil Dipstick Guide Tube Bolt

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-- Tighten the bolt -arrow- to 9 Nm.