Overview - VALVETRAIN

Fig 1: Exploded View Of Valvetrain

Courtesy of AUDI OF AMERICA, LLC

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. Intake Valve
   • Do not rework, only lapping is permitted
   • Valve Dimensions. Refer to VALVE DIMENSIONS .
   • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
3. Cylinder Head
   • Overview. Refer to OVERVIEW - CYLINDER HEAD .
4. Valve Stem Seal
   • Allocation. Refer to Fig 5.
   • Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
5. Valve Spring
   • Installation position and allocation. Refer to Fig 3.
6. Valve Spring Retainer
7. Valve Retainers
8. Hydraulic Lifter
   • Do not interchange
   • Coat the contact surface with engine oil
9. Roller Rocker Lever
   • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
   • Mark the installed position for reinstallation.
   • Check the roller bearing for ease of movement
   • Coat the contact surfaces with engine oil
   • Allocation. Refer to Fig 4.
10. Clip
    • For hydraulic lifter
11. Exhaust Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Axial play: new 0.1 ^+0.102_-0.05 mm
    • Radial clearance: 0.024 to 0.066 mm
    • Maximum run out: 0.04 mm
    • After removing and installing or replacing an adaptation must be performed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
12. Spring
13. Ball
    • For sliding bar
    • Installing. Refer to SLIDING BAR BALL, INSTALLING .
14. Cylinder Head Cover
    • With integrated camshaft bearings
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Only clean the sealing surface, reworking is not permitted.
    • Remove old sealant residue.
    • Pay attention to the cylinder head cover pairing number and cylinder head. Refer to Figure.
15. Bolt
    • Tightening Specifications and Sequence. Refer to Fig 2.
    • Replace after removing
16. O-Ring
    • Not available separately; replace if leaking -item  ) Cam Adjustment Actuator or damaged
    • Coat with engine oil
17. Bolt
    • 4.5 Nm
18. 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 .
19. Ball Pin
    • 9 Nm
    • For the engine cover
    • Quantity: 2
20. Bracket
    • For the wiring harness
21. Bolt
    • 9 Nm
22. Plugs
23. O-Ring
    • Replace after removing
24. Intake Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Axial play: new 0.1 ^+0.102_-0.05 mm
    • Radial clearance: 0.024 to 0.066 mm
    • Maximum run out: 0.04 mm
    • After removing and installing or replacing an adaptation must be performed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
25. Alignment Pin
    • Quantity: 2

Cylinder Head Cover - Tightening Specifications and Sequence 

Fig 2: Cylinder Head Cover Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

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

-- Tighten the bolts -1 to 6- in steps in the sequence shown:

Valve Spring, Installation Position and Allocation 

Fig 3: Camshaft Cylinder Head Bank 1 (Right)

Courtesy of AUDI OF AMERICA, LLC

• The tight spring coils -arrow- face toward cylinder head.
• Length of the valve spring, intake side, approximately 45.5 mm.
• Length of the valve spring, exhaust side, approximately 51.0 mm.

Roller Rocker Lever, Allocation 

Fig 4: Roller Rocker Lever, Allocation

Courtesy of AUDI OF AMERICA, LLC

• Roller rocker lever, intake side, dimension -b- = 8.0 mm
• Roller rocker lever, exhaust side, dimension -a- = 5.4 mm

Valve Stem Seal Allocation 

Fig 5: Different Valve Stem Seals

Courtesy of AUDI OF AMERICA, LLC

A -  Valve Stem Seal with a Sealing Lip -A-, Colored Green

• For the intake side

B -  Valve Stem Seal with Two Sealing Lips -B-, Colored Red

• For the exhaust side