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Home >> Audi >> 2016 >> S4 Premium Plus, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 629 (2.0L - Cylinder Head & VALVETRAIN - Engine Code(S): CAEB, CHJA, CPMA & CPMB) >> 15 Cylinder Head, VALVETRAIN >> Cylinder Head >> Overview - Cylinder Head

Overview - Cylinder Head

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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.

The engine oil and coolant must be changed if the cylinder head or cylinder head seal are replaced.

Fig 1: Cylinder Head Overview
GWWA15-10741Courtesy of AUDI OF AMERICA, LLC
  1. Cylinder Head Gasket
    • Replacing
    • Installed position: the part number faces the cylinder head
  2. Bolt
    • Tightening specification: 25 Nm
  3. Transport Strap
  4. Bolt
    • Replacing
    • 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
    • Replacing
    • Follow the procedure when loosening, refer to Fig 4
    • Follow the procedure when tightening, refer toFig 5
  7. O-Ring
    • Replacing
    • Coat with engine oil
  8. Cam Adjustment Actuator
  9. Bolt
    • Tightening specification: 5 Nm
  10. O-Ring
    • Replacing
    • Lubricate with engine oil
  11. Plug
    • Tightening specification: 5 Nm
    • With ball head for the engine cover
  12. Cap
    • With seal
  13. O-Ring
    • Replacing
    • Lubricate with engine oil
  14. Plug
  15. To Intake Manifold
  16. Heat Shield
  17. Bolt
    • Tightening specification: 20 Nm
  18. Bolt
    • Tightening specification: 20 Nm
  19. To Intake Manifold/Turbocharger
  20. Ventilation Pipe
  21. O-Ring
    • No replacement part
  22. Seal
    • No replacement part
  23. Engine Cover
    • Different versions, refer to parts.
  24. Bolt
    • Tightening sequence, refer to Fig 2
  25. Crankcase Ventilation
  26. Seal
    • Replace if damaged.
  27. Seal
    • Replace if damaged.
  28. Vacuum Pump
  29. Bolt
  30. Connection
  31. Retaining Plate
  32. Bolt
    • Tightening specification: 9 Nm
  33. O-Ring
    • Replacing
    • Coat with coolant
  34. Transport Strap
  35. Bolt
    • Tightening specification: 25 Nm
  36. Bolt
    • Tightening specification: 9 Nm
    • Camshaft Position Sensor
  37. Camshaft Position Sensor -G40-
  38. Partition Plate
  39. O-Ring
    • Replacing
    • Lubricate with engine oil
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: 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 the sequence -1 to 10-.

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

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

-- Partially tighten to 40 Nm using a torque wrench.

-- Turn another 90° using a rigid wrench.

-- Turn another 90° using a rigid wrench.

-- Partially tighten the bolts -arrows- to 8 Nm.

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

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