Overview - VALVETRAIN

Fig 1: Exploded View Of Valvetrain

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • Tightening specification -item Item: Bolt .
2. Camshaft Position Sensor -G40-
   • Overview. Refer to OVERVIEW - GLOW PLUG SYSTEM .
3. O-Ring
   • Replace if damaged or leaking
4. Cap
   • Replace after removing
   • Removing: with the camshaft housing installed, pierce through one side of the cover with a punch and pry it out.
   • Installing: drive in without sealant until it is flush using a suitable thrust piece, such as the Torque Adapter: 3390 
5. Camshaft Seal
   • Replacing. Refer to CAMSHAFT SEAL, REMOVING AND INSTALLING .
6. Camshaft Housing
   • With integrated camshafts
   • Removing and Installing. Refer to CAMSHAFT HOUSING, REMOVING AND INSTALLING .
   • Do not start the engine for approximately 30 minutes after installing the camshafts.
7. Bolt
   • Replace after removing
   • Loosening sequence. Refer to Fig 2.
   • Tightening specification and sequence. Refer to Fig 3.
8. Seal
   • Replace after removing
9. Cover
10. Bolt
    • 8 Nm
11. Bolt
    • Depending on the version, not installed in all vehicles
    • 8 Nm
12. Camshaft Adjustment Valve 1 -N205-
    • Depending on the version, not installed in all vehicles
    • An adaptation must be performed after replacing or removing and installing the Camshaft Adjustment Valve 1 -N205-. Use the Vehicle Diagnostic Tester under Guided Functions  , 01 - Adapting the electric actuator with feedback  .
    • Removing and Installing. Refer to Camshaft Adjustment Valve 1 -N205-, REMOVING AND INSTALLING .
13. Seal
    • Depending on the version, not installed in all vehicles
    • Replace after removing
14. Bolt
    • Depending on the version, not installed in all vehicles
    • Tightening specification and sequence. Refer to Fig 4.
15. Housing
    • For the camshaft adjuster
    • Depending on the version, not installed in all vehicles
16. Alignment Sleeve
    • Depending on the version, not installed in all vehicles
17. Seal
    • Depending on the version, not installed in all vehicles
    • Replace after removing
18. Control Valve
    • Depending on the version, not installed in all vehicles
    • An adaptation must be performed after replacing or removing and installing by using the Vehicle Diagnostic Tester under Guided Functions  , 01 - Adapting the electric actuator with feedback  .
    • Removing and Installing. Refer to CONTROL VALVE FOR Camshaft Adjustment Valve 1 -N205-, REMOVING AND INSTALLING .
    • 50 Nm
19. Camshaft Adjuster
    • Depending on the version, not installed in all vehicles
    • Pay attention to the installation of the friction disc (risk of engine damage)
    • An adaptation must be performed after replacing or removing and installing by using the Vehicle Diagnostic Tester under Guided Functions  , 01 - Adapting the electric actuator with feedback  .
    • Removing and Installing. Refer to CAMSHAFT ADJUSTER, REMOVING AND INSTALLING .
20. Friction Disc
    • Before installing check that the camshaft adjuster is present
21. Plug
    • With gasket
    • 15 Nm
22. Alignment Pins
    • For the camshaft housing
23. Exhaust Valve
    • Do not rework, only grinding is permitted
    • Mark the installed position for reinstallation.
    • Check using the Vehicle Diagnostic Tester Refer to VALVES, CHECKING .
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
24. Intake Valve
    • Do not rework, only grinding is permitted
    • Mark the installed position for reinstallation.
    • Check using the Vehicle Diagnostic Tester Refer to VALVES, CHECKING .
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
25. Cylinder Head
    • The valve seat may not reworked due to a close tolerances.
    • Cylinder heads with cracks between the valve seats can continue to be used without reducing service life, as long as the cracks have a width of maximum 0.5 mm.
26. Valve Stem Seal
    • Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
27. Valve Spring
28. Valve Spring Retainer
29. Valve Keepers
30. Hydraulic Lifter
    • Mark the installed position for reinstallation.
    • Lubricate the running surfaces before installing
31. Roller Rocker Lever
    • Removing and Installing. Refer to CAMSHAFT HOUSING, REMOVING AND INSTALLING .
    • Mark the installed position for reinstallation.
    • Check the roller bearing for ease of movement
    • Lubricate the running surfaces before installing
32. Clip
    • For hydraulic lifter

Loosen the camshaft housing bolts in the sequence: 18 to 1.

Fig 2: Camshaft Housing Loosening Sequence (Loosen 18 to 1)

Courtesy of AUDI OF AMERICA, LLC

Camshaft Housing - Tightening Specification and Sequence 

Fig 3: Camshaft Housing Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

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

Camshaft Adjuster Housing - Tightening Specification and Sequence 

Fig 4: Camshaft Adjuster Housing - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

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