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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 >> Without AVS >> Cylinder Head Overview

Cylinder Head Overview

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
GWWA15-10725Courtesy 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 sequence when loosening, refer to Fig 3
    • Observe sequence for tightening, refer to Fig 4
  5. Cylinder Head
  6. Cylinder Head Bolt
    • Replace
    • Follow the sequence when loosening, refer to Fig 3
    • Observe sequence for tightening, refer to Fig 4
  7. O-ring
    • Replace
    • Lubricate with engine oil
  8. Plug
    • 5 Nm
    • With ball head for the engine cover
  9. Cover
    • With gasket
  10. O-ring
    • Replace
    • Lubricate with engine oil
  11. Plug
  12. Bracket
  13. Bolt
    • 9 Nm
  14. Heat Shield
  15. Bolt
    • 20 Nm
  16. Bolt
    • 20 Nm
  17. To the Intake Manifold/Turbocharger
  18. Ventilation Pipe
  19. O-ring
    • No replacement part
  20. Gasket
    • No replacement part
  21. Engine Cover
  22. Bolt
    • Tightening sequence, refer to Fig 2
  23. Crankcase Ventilation
    • Observe sequence for tightening, refer to Fig 2
  24. To the Intake Manifold
  25. Gasket
    • No replacement part
  26. Gasket
    • Replace if damaged
  27. Vacuum Pump
  28. Bolt
  29. Retaining Plate
  30. Bolt
    • 9 Nm
  31. Connecting Piece
  32. O-ring
    • Replace
    • Coat with coolant
  33. Engine Lifting Eye
  34. Bolt
    • 25 Nm
  35. Bolt
    • 9 Nm
  36. Camshaft Position (CMP) Sensor -G40-
  37. O-ring
    • Replace
    • Lubricate with engine oil
  38. 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 -1 to 10- sequence.

Fig 3: Cylinder Head Loosening Sequence
GWWA15-10474Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows-.

-- Loosen the cylinder head bolts in sequence -1 to 5-

Fig 4: Cylinder Head Tightening Sequence
GWWA15-10475Courtesy of AUDI OF AMERICA, LLC

-- Tighten the cylinder head bolts in sequence -1 to 5-.

-- 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.

Fig 5: 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.

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