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Home >> Audi >> 2016 >> S4 Premium Plus, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 1171 (Cylinder Head, VALVETRAIN [CAUA] (Coupe)) >> 15 Cylinder Head, VALVETRAIN >> VALVETRAIN >> Overview - VALVETRAIN >> Notes

Overview - VALVETRAIN: Notes

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CAUTION:

Risk Of Damaging Valves And Piston Heads After Working On Valve Train.

  • The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.
  • To ensure valves do not strike pistons when starting, carefully rotate engine at least two full revolutions.
NOTE:

Cylinder Heads With Cracks Between Valve Seats Or Between Valve Seat And Spark Plug Thread Can Still Be Used Without Loss Of Service Life If The Cracks Are Minute (Max. 0.3 Mm Width) Or Only The First Four Threads Of A Spark Plug Thread Are Cracked.

The illustration shows the cylinder bank 2 cylinder head (left).

Fig 1: Exploded View Of Valvetrain, Assembly
GWWA15-10259Courtesy of AUDI OF AMERICA, LLC
  1. Sealing Plug
  2. Valve Stem Seal
  3. Valve Spring
    • Installed position. Refer to Figure
  4. Hydraulic Adjusting Element
    • Clipped into roller rocker lever -8-
    • Checking. Refer to HYDRAULIC ADJUSTING ELEMENTS, CHECKING .
    • Mark the installation position with paint for reinstallation
    • Lubricate the running surfaces before installing
  5. Valve Spring Retainer
  6. Valve Retainers
  7. Clip
    • Not available individually
    • Make sure it is secure
  8. Roller Rocker Lever
    • Mark the installation position with paint for reinstallation
    • Check roller for easy movement
    • Lubricate the running surfaces before installing
    • Clip to the hydraulic adjusting element -4- with the clip -7-
  9. Intake Camshaft
  10. Seal
    • Always replace
  11. Guide Frame
  12. Bolt
    • Tightening Specification and sequence. Refer to Figure.
    • Always replace
  13. Camshaft Position Sensor 2 -G163-
  14. Bolt
  15. O-ring
    • Always replace
  16. Bolt
  17. Camshaft Position Sensor 4 -G301-
  18. O-ring
    • Always replace
  19. Flat Ring
    • For camshaft adjuster
  20. Exhaust Camshaft
  21. Cylinder Head
  22. Intake Valve
    • Do not rework, only lapping is permitted
    • Mark the installed position for installation later
    • Valve dimensions. Refer to VALVE DIMENSIONS 
    • Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
  23. Exhaust Valve
    • Do not rework, only lapping is permitted
    • Mark the installed position for installation later
    • Valve dimensions. Refer to VALVE DIMENSIONS 
    • Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
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