Overview - VALVETRAIN, Engine With One Camshaft Adjuster

Part I 

Part II. Refer to Part II  below.

Fig 1: Exploded View Of Valvetrain (Engine With One Camshaft Adjusters - Part I)

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
   • 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
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
    • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
11. 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
12. Bolt
    • Tightening Specifications and Sequence. Refer to Figure.
    • Always replace after removing
    • Loosening. Refer to Figure.
13. Intake Camshaft
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
    • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
14. Alignment Pin
15. Alignment Pin
16. Intake Valve
    • Do not rework, only lapping is permitted
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .

Part II 

Part I. Refer to Part I  below.

Fig 2: Exploded View Of Valvetrain (Engine With One Camshaft Adjusters - Part II)

Courtesy of AUDI OF AMERICA, LLC

1. Cylinder Head
   • Do not rework the upper sealing surface
   • Only replace the cylinder head and cylinder head cover together
2. Ball Pin
   • 9 Nm
   • For the engine cover
3. O-Ring
   • Always replace after removing
   • Coat with engine oil
4. Plugs
5. Oil Separator
   • Removing and installing. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .
6. Bolt
   • Tightening specification and sequence. Refer to Fig 3.
7. Seal
   • Always replace after removing
8. Vacuum Pump
   • Overview. Refer to OVERVIEW - VACUUM PUMP .
9. Bolt
   • Tightening specification. Refer to OVERVIEW - VACUUM PUMP .
10. Seal
    • Always replace if damaged
11. O-Ring
    • Always replace after removing
    • Coat with engine oil
12. Camshaft Position Sensor -G40-
    • Overview. Refer to OVERVIEW - IGNITION SYSTEM .
13. Bolt
    • Tightening specification -item 13) Bolt
14. Bolts
    • 9 Nm
15. Bracket
    • For EVAP Canister Purge Regulator Valve 1 -N80-

Fig 3: Oil Separator - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC