Overview - Cylinder Head, Engine With Wrench Clearance

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: Overview Of Cylinder Head Components

Courtesy of AUDI OF AMERICA, LLC

Cylinder Head Gasket
- Replace
- Installed position: the part number faces the cylinder head
Bolt
- 25 Nm
Transport Strap
Bolt
- Tighten in 2 steps:
  -- Tighten to 8 Nm
  
  -- Tighten 90° further using a rigid wrench.
Cylinder Head
- Removing and installing. Refer to CYLINDER HEAD, REMOVING AND INSTALLING, ENGINE WITH WRENCH CLEARANCE .
- Check for distortion. Refer to Figure
Cylinder Head Bolt
- Replace
- Follow the procedure when tightening. Refer to INSTALLING - Set the cylinder head in place (See Figure).
- Tighten in 3 stages:
  -- Tighten to 40 Nm
  
  -- Tighten 90° further using a rigid wrench.
  
  -- Tighten 90° further using a rigid wrench.
O-Ring
- Replace
- Coat with engine oil
Cam Adjustment Actuator
Bolt
- 5 Nm
O-Ring
- Replace
- Lubricate with engine oil
Sealing Plugs
- 5 Nm
- With ball head for the engine cover
Cap
- With seal
O-Ring
- Replace
- Lubricate with engine oil
Sealing Plugs
To Intake Manifold
Heat Shield
Bolt
- 20 Nm
Bolt
- 20 Nm
To Intake Manifold/Turbocharger
Ventilation Pipe
O-Ring
- No replacement part
Seal
- No replacement part
Engine Cover
Bolt
- Tightening sequence. Refer to Fig 4
Crankcase Ventilation
Seal
- Replace if damaged.
Seal
- Replace if damaged.
Vacuum Pump
- Removing and installing. Refer to HIGH PRESSURE PUMP, REMOVING AND INSTALLING and OVERVIEW - HIGH PRESSURE PUMP
Bolt
- Tightening specification. Refer to OVERVIEW - HIGH PRESSURE PUMP .
Connection
Retaining Plate
Bolt
- 9 Nm
O-Ring
- Replace
- Coat with coolant
Transport Strap
Bolt
- 25 Nm
Bolt
- 9 Nm
Camshaft Position Sensor -G40-
Partition Plate
O-Ring
- Replace
- Lubricate with engine oil

Fig 2: Camshaft Recesses

Courtesy of AUDI OF AMERICA, LLC

Camshafts with wrench clearance have notches -arrows- in the camshafts.

Camshafts without wrench clearance do not have notches in the camshafts.

To check, turn the plugs -arrows- 90° counter clockwise in direction of -arrow- and remove them.

Fig 3: Ball Head And Sealing Plug

Courtesy of AUDI OF AMERICA, LLC

Fig 4: Identifying Crankcase Ventilation - Tightening Sequence

Courtesy 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 housing ventilation.

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

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