Part I

Part II. Refer to Part II .

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. 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 

Fig 2: Cylinder Head Cover Bolt Loosening Sequence

Courtesy of AUDI OF AMERICA, LLC

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

Cylinder Head Cover - Tightening Specifications and Sequence 

Fig 3: Cylinder Head Cover Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

• 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:

Different Valve Stem Seals 

Fig 4: Different Valve Stem Seals

Courtesy of AUDI OF AMERICA, LLC

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.