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Home >> Audi >> 2012 >> TT Base, 2D Convertible >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 2.0L - Cylinder Head, VALVETRAIN - Engine Code(S): CCTA & CETA (Roadster) >> 15 Cylinder Head, VALVETRAIN >> Description And Operation >> With AVS >> Cylinder Head Overview With AVS

Cylinder Head Overview With AVS

NOTE:

Replace the cylinder head bolts.

Always replace self-locking nuts, bolts which have been tightened to tightening specifications as well as gaskets and O-rings.

The plastic protectors installed to protect the open valves must only be removed immediately before fitting the cylinder head.

It is necessary to replace all the coolant and engine oil whenever the cylinder head or the cylinder head gasket are replaced.

Fig 1: Cylinder Head Overview With AVS
GWWA15-11122Courtesy of AUDI OF AMERICA, LLC
  1. Cylinder Head Gasket
    • Replace
    • Note installation position: Parts number to cylinder head
  2. Bolt
    • 25 Nm
  3. Engine Lifting Eye
  4. Bolt
    • Replace
    • Follow the procedure when loosening. Refer to Fig 4.
    • Follow the procedure when tightening. Refer to Fig 5.
  5. Cylinder Head
  6. Cylinder Head Bolt
    • Replace
    • Follow the procedure when loosening. Refer to Fig 4.
    • Follow the procedure when tightening. Refer to Fig 5.
  7. O-ring
    • Replace
    • Coat with engine oil
  8. Camshaft Adjuster Actuator
  9. Bolt
    • 5 Nm
  10. O-ring
    • Replace
    • Lubricate with engine oil
  11. Plug
    • 5 Nm
    • With ball head for the engine cover
  12. Cover
    • With gasket
  13. O-ring
    • Replace
    • Lubricate with engine oil
  14. Plug
  15. Bracket
  16. Bolt
    • 9 Nm
  17. Heat Shield
  18. Bolt
    • 20 Nm
  19. Bolt
    • 20 Nm
  20. To the Intake Manifold/Turbocharger
  21. Ventilation Pipe
  22. O-ring
    • No replacement part
  23. Gasket
    • No replacement part
  24. Engine Cover
  25. Bolt
    • Tightening sequence, refer to Fig 2
  26. Crankcase Ventilation
  27. To the Intake Manifold
  28. Gasket
    • No replacement part
  29. Gasket
    • Replace if damaged
  30. Vacuum Pump
  31. Bolt
  32. Retaining Plate
  33. Bolt
    • 9 Nm
  34. Connecting Piece
  35. O-ring
    • Replace
    • Coat with coolant
  36. Engine Lifting Eye
  37. Bolt
    • 25 Nm
  38. Bolt
    • 9 Nm
  39. Camshaft Position (CMP) Sensor -G40-
  40. O-ring
    • Replace
    • Lubricate with engine oil
  41. Partition Plate
Fig 2: Identifying Crankcase Ventilation - Tightening Sequence
GWWA15-10605Courtesy of AUDI OF AMERICA, LLC
NOTE:

The bolts are self-tapping. Only use original bolts when replacing the cylinder head, since the cylinder head is delivered without a thread for the installing the crankcase ventilation.

It is not permitted to cut the thread with a thread cutter.

-- Tighten the crankcase ventilation bolts to 11 Nm in sequence -1 to 10-.

Fig 3: Checking Cylinder Head For Distortion
GWWV15-0654Courtesy of AUDI OF AMERICA, LLC

-- Check the cylinder head in several places for distortion using a straight edge and a feeler gauge.

Fig 4: Cylinder Head Loosening Sequence
GWWA15-11209Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows-.

-- Loosen the cylinder head bolts in sequence -1 to 10-.

Fig 5: Cylinder Head Tightening Sequence
GWWA15-11210Courtesy of AUDI OF AMERICA, LLC

-- Tighten the cylinder head bolts in -1 to 10- sequence.

-- Tighten to 40 Nm using a torque wrench.

-- Tighten further 90° using a rigid wrench.

-- Tighten further 90° using a rigid wrench.

-- Tighten the bolts -arrows- to 8 Nm.

-- Tighten the bolts -arrows- 90° further using a rigid wrench.

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