Overview - Cylinder Head

Fig 1: Exploded View Of Cylinder Head

Courtesy of AUDI OF AMERICA, LLC

1. Check Valve
   • For the coolant
2. Cylinder Head
   • Shown for cylinder bank 2 (left)
   • Removing and Installing. Refer to CYLINDER HEAD, REMOVING AND INSTALLING .
   • Checking for distortion. Refer to Fig 6.
   • Reworking Dimensions. Refer to Fig 7.
   • Change the coolant and engine oil after replacing
3. Bolt
   • Replace after removing.
   • Loosening sequence:
     • Cylinder bank 1 (right). Refer to CYLINDER HEAD BANK 1 (RIGHT), REMOVING, 2.9L ENGINE - Loosen the cylinder head bolts in the sequence -1 to 8-. .
     • Cylinder bank 2 (left). Refer to CYLINDER HEAD BANK 2 (LEFT), REMOVING, 3.0L ENGINE - Remove the bolts -arrows and 9-. .
   • Tightening Specifications and Sequence:
     • Cylinder bank 1 (right). Refer to Fig 2.
     • Cylinder bank 2 (left). Refer to Fig 3.
4. Engine Lifting Eye
5. Bolt
   • 22 Nm
6. Ball Pin
   • 5 Nm +45°
   • For the engine cover
7. Bolt
   • 22 Nm
8. Engine Lifting Eye
9. Bolt
   • Replace after removing.
   • Loosening sequence:
     • Cylinder bank 1 (right). Refer to CYLINDER HEAD BANK 1 (RIGHT), REMOVING, 2.9L ENGINE - Loosen the cylinder head bolts in the sequence -1 to 8-. .
     • Cylinder bank 2 (left). Refer to CYLINDER HEAD BANK 2 (LEFT), REMOVING, 3.0L ENGINE - Remove the bolts -arrows and 9-. .
   • Tightening Specifications and Sequence:
     • Cylinder bank 1 (right). Refer to Fig 2.
     • Cylinder bank 2 (left). Refer to Fig 3.
10. Cylinder Head Gasket
    • Replacing. Refer to CYLINDER HEAD, REMOVING AND INSTALLING .
    • Installed position: the part number faces the cylinder head
    • Change the coolant and engine oil after replacing
11. Bolt
    • Replace after removing.
    • Loosening sequence:
      • Cylinder bank 1 (right). Refer to CYLINDER HEAD BANK 1 (RIGHT), REMOVING, 2.9L ENGINE - Loosen the cylinder head bolts in the sequence -1 to 8-. .
      • Cylinder bank 2 (left). Refer to CYLINDER HEAD BANK 2 (LEFT), REMOVING, 3.0L ENGINE - Remove the bolts -arrows and 9-. .
    • Tightening Specifications and Sequence:
      • Cylinder bank 1 (right). Refer to Fig 2.
      • Cylinder bank 2 (left). Refer to Fig 3.

Bank 1 (Right) Cylinder Head - Tightening Specification and Sequence 

Fig 2: Bank 1 (Right) Cylinder Head - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

• Replace the bolts that were tightened with an additional turn after removing them.

-- Tighten the bolts in the steps shown in the sequence:

Bank 2 (Left) Cylinder Head - Tightening Specification and Sequence 

Fig 3: Bank 2 (Left) Cylinder Head - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

• Replace the bolts that were tightened with an additional turn after removing them.

-- Tighten the bolts in the steps shown in the sequence:

Cylinder Bank 1 (Right) Coolant Ventilation Line, Installing 

Fig 4: Cylinder Bank 1 (Right) Coolant Ventilation Line, Installing

Courtesy of AUDI OF AMERICA, LLC

• Replace the O-ring after removing.

-- Tighten the bolt -1- to 9 Nm.

Cylinder Bank 2 (Left) Coolant Ventilation Line, Installing 

Fig 5: Cylinder Bank 2 (Left) Coolant Ventilation Line, Installing

Courtesy of AUDI OF AMERICA, LLC

• Replace the O-ring after removing.

-- Tighten the bolt -arrow- for the coolant ventilation line -3- to 9 Nm.

Cylinder Head, Checking for Distortion 

Fig 6: Check Cylinder Head For Distortions

Courtesy of AUDI OF AMERICA, LLC

-- Check the cylinder head at several locations for distortion using a : VAS6075  and a feeler gauge.

• Maximum permissible distortion: 0.1 mm.

Cylinder Head Reworking Dimension 

Fig 7: Cylinder Head Refacing Dimension

Courtesy of AUDI OF AMERICA, LLC

Reworking the cylinder head (face grinding) is only permissible to the minimum dimension -a-.

• Minimum dimension -a- = 138.0 ± 0.1 mm.