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Home >> Audi >> 2021 >> S5 Premium Plus, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 491 (Cylinder Head, VALVETRAIN (Servicing 8-Cylinder 4.0L 4V TFSI Engine Ea825)) >> 15 Cylinder Head, VALVETRAIN >> VALVETRAIN >> Overview - VALVETRAIN

Overview - VALVETRAIN

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Fig 1: Exploded View Of Valvetrain
GWWA15-12190Courtesy of AUDI OF AMERICA, LLC
  1. Intake Valve
    • Do not rework, only grinding is permitted
    • Mark the installed position for reinstallation.
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
  2. Lower Valve Spring Retainer
  3. Valve Stem Seal
  4. Valve Spring
  5. Upper Valve Spring Retainer
  6. Valve Keepers
  7. Roller Rocker Lever
    • Mark the installation position with paint for reinstallation
    • Check the roller bearing for ease of movement
    • Oil the running surfaces before installing
    • Clipped in with the clamp  OVERVIEW - VALVETRAIN on the hydraulic lifter  OVERVIEW - VALVETRAIN
  8. Clip
    • Not available separately.
    • Check for secure fit
  9. Hydraulic Lifter
    • Clipped in the roller rocker lever  OVERVIEW - VALVETRAIN
    • Mark the installation position with paint for reinstallation
    • Oil the running surfaces before installing
  10. Cylinder Head
  11. Exhaust Valve
    • Do not rework, only grinding is permitted
    • Mark the installed position for reinstallation.
    • Valve Dimensions. Refer to VALVE DIMENSIONS .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .

Installation position of the intake valve spring

Fig 2: Camshaft Cylinder Head Bank 1 (Right)
GWWA15-10101Courtesy of AUDI OF AMERICA, LLC

Installation position of the exhaust valve spring

Fig 3: Installation Position of the Exhaust Valve Spring
GWWA15-12034Courtesy of AUDI OF AMERICA, LLC