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 grinding is permitted
   • Valve Dimensions. Refer to VALVE DIMENSIONS .
   • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
2. Cylinder Head
3. Valve Stem Seal
   • Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING, CYLINDER HEAD INSTALLED  and Refer to VALVE STEM SEALS, REMOVING AND INSTALLING, CYLINDER HEAD REMOVED .
4. Valve Spring
5. Valve Spring Retainer
6. Valve Keepers
7. Hydraulic Lifter
   • Do not interchange
   • Lubricate the contact surface
8. Clip
   • For hydraulic lifter
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
   • Lubricate the running surfaces before installing
10. Exhaust Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigage (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
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 and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
14. Bolt
    • Replace
    • Loosening. Refer to Fig 2.
    • Tightening sequence. Refer to Fig 3.
15. Intake Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Check the radial clearance using Plastigage (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
16. Alignment Pins
17. Alignment Pins
18. Intake Valve
    • Do not rework, only grinding is permitted
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .

Cylinder Head Cover, Loosening

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 sequence

Fig 3: Cylinder Head Cover Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Replace the bolts.

-- Hand-tighten bolts the in several steps in -1 to 6- sequence.

-- Tighten the bolts in a -1 to 6- sequence to 8 Nm using a torque wrench.

-- Tighten the bolts an additional 90° using a rigid wrench in the sequence -1 to 6-.