Overview - VALVETRAIN, Engine With Two Camshaft Adjusters

Part I 

Part II. Refer to Part II  below.

1. Exhaust Valve
   • Do not rework, only lapping is permitted
   • Valve Dimensions. Refer to VALVE DIMENSIONS .
   • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
2. Cylinder Head
   • Do not rework the upper sealing surface
   • Only replace the cylinder head and cylinder head cover together
3. Valve Stem Seal
   • There are different versions. Refer to Fig 4.
   • Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
4. Valve Spring
5. Valve Spring Retainer
6. Valve Retainers
7. Hydraulic Lifter
   • Do not interchange
   • Lubricate the contact surface
8. Clip
   • For hydraulic lifter
9. Roller Rocker Lever
   • Mark the installed position for reinstallation.
   • Check the roller bearing for ease of movement
   • Lubricate the running surfaces before installing
   • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
10. Exhaust Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
    • Perform the adaptation after removing or replacing using the Vehicle Diagnostic Tester 01 - Engine electronics, functions  , 01 - Chain length diagnostic adaptation 
11. Spring
    • No replacement part
12. Ball
    • For sliding bar
    • Installing. Refer to SLIDING BAR BALL, INSTALLING .
13. Cylinder Head Cover
    • With integrated camshaft bearings
    • Clean the sealing surface, reworking is not permitted.
    • Remove old sealant residue.
    • Removing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Only replace the cylinder head and cylinder head cover together
    • Perform the adaptation after removing or replacing using the Vehicle Diagnostic Tester 01 - Engine electronics, functions  , 01 - Chain length diagnostic adaptation 
14. Bolt
    • Tightening sequence. Refer to Fig 3.
    • Always replace after removing
    • Loosening. Refer to Fig 2.
15. Intake Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
    • Perform the adaptation after removing or replacing using the Vehicle Diagnostic Tester 01 - Engine electronics, functions  , 01 - Chain length diagnostic adaptation 
16. Alignment Pin
17. Alignment Pin
18. Intake Valve
    • Do not rework, only lapping is permitted
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .

Loosening the Cylinder Head Cover 

-- Loosen the cylinder head cover in the sequence -1 through 6-.

Cylinder Head Cover - Tightening Specifications and Sequence 

• Replace the bolts that were tightened with an additional turn after removing them.
• Pay attention that the cylinder head cover is not tilted.

-- Tighten the bolts in the steps shown in the sequence:

Step	Bolts	Tightening Specification/Additional Turn
1.	-1 to 6-	Install all the way in multiple steps by hand
2.	-1 to 6-	8 Nm
3.	-1 to 6-	90° additional turn

Different Valve Stem Seals 

A -  Valve stem seal with a sealing lip -A-

• For intake and exhaust side

B -  Valve stem seal with two sealing lips -B-

• Only for exhaust side, specific engines. Refer to the Parts Information for the allocation.

Part II 

Part I. Refer to Part I  below.

1. Cylinder Head
   • Do not rework the upper sealing surface
   • Only replace the cylinder head and cylinder head cover together
2. O-Ring
   • Check for damage
   • Not available separately, included in the delivery package -item  ) Cam Adjustment Actuator
   • Coat with engine oil
3. Cam Adjustment Actuator
   • Cam Adjustment Actuator 1 -F366-
   • Cam Adjustment Actuator 2 -F367-
   • Cam Adjustment Actuator 3 -F368-
   • Cam Adjustment Actuator 4 -F369-
   • Cam Adjustment Actuator 5 -F370-
   • Cam Adjustment Actuator 6 -F371-
   • Cam Adjustment Actuator 7 -F372-
   • Cam Adjustment Actuator 8 -F373-
   • Removing and installing. Refer to CAM ADJUSTMENT ACTUATOR, REMOVING AND INSTALLING .
   • Bring into the installation position. Refer to Installing - The cam adjustment actuator pin must be brought into the installation position. .
4. Bolt
   • 5 Nm
5. Ball Pin
   • 9 Nm
   • For the engine cover
6. O-Ring
   • Replace if damaged
   • Coat with engine oil
7. Plugs
8. O-Ring
   • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
9. Camshaft Position Sensor 3 -G300-
   • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
10. Bolt
    • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
11. Oil Separator
    • Removing and installing. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .
12. Bolt
    • Tightening specification and sequence. Refer to Fig 6.
13. Seal
    • Always replace after removing
14. Vacuum Pump
    • Overview. Refer to OVERVIEW - VACUUM PUMP .
15. Bolt
    • Tightening specification. Refer to OVERVIEW - VACUUM PUMP .
16. Seal
    • Always replace if damaged
17. O-Ring
    • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
18. Camshaft Position Sensor -G40-
    • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
19. Bolt
    • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
20. Bolt
    • 9 Nm
21. Bracket
    • For EVAP Canister Purge Regulator Valve 1 -N80-