Overview - Cylinder Head

Fig 1: Cylinder Head And Cover Overview

Courtesy of AUDI OF AMERICA, LLC

1. Cylinder Head Gasket
   • Replacing. Refer to CYLINDER HEADS, REMOVING AND INSTALLING 
   • Installed position: the part number faces the cylinder head
   • Change the coolant and engine oil after replacing
2. Cylinder Head
   • Removing and installing. Refer to CYLINDER HEADS, REMOVING AND INSTALLING 
   • Check for distortion. Refer to Fig 5
   • Reworking dimension. Refer to Fig 6
   • Change the coolant and engine oil after replacing
3. O-Ring
   • Replace
4. Camshaft Position Sensor
   • Cylinder bank 1 (right) Camshaft Position Sensor -G40-
   • Cylinder bank 2 (left) Camshaft Position Sensor 2 -G163-
5. Bolt
   • Tightening specification. Refer to Special Tools .
6. Bolt
   • Replace
   • Follow the sequence when loosening. Refer to Removing .
   • Tightening specification and sequence. Refer to Fig 4
7. Ignition Coil
   • Removing and installing. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING
8. Cylinder Head Cover
   • Removing and installing. Refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING  for left side. Refer to RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING  for right side.
9. Seal
   • Replace if damaged or leaking
10. Cover
11. Hose
    • For the crankcase ventilation
    • Removing and installing. Refer to CRANKCASE VENTILATION HOSES, REMOVING AND INSTALLING
      CAUTION:

      Risk of violating emissions legislation.

      • Do not open the hose connection.
12. O-Ring
    • Replace
13. Bolt
    • Replace if the seal is damaged
    • Tightening specification and sequence: left cylinder head cover. Refer to Fig 2, right cylinder head cover Fig 3
14. Bolt
    • Tightening specification. Refer to Special Tools
15. Connector Strip
    • For the ignition coils
16. Seal
    • For the cylinder head cover
    • Replace if damaged or leaking
17. Camshaft Adjustment Solenoid Valve
    • Cylinder bank 1 (right) Camshaft Adjustment Valve 1 -N205-
    • Cylinder bank 2 (left) Camshaft Adjustment Valve 2 -N208-
18. Bolt
    • 5 Nm
19. O-Ring
    • Replace

Fig 2: Identifying Left Cylinder Head Cover Bolt Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts to 9 Nm in the following sequence: -1 to 12-.

Fig 3: Identifying Right Cylinder Head Cover Bolt Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts to 9 Nm in the following sequence: -1 to 12-.

Fig 4: Cylinder Head Bolt Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts in four steps in the sequence shown.

Fig 5: Checking Cylinder Head Distortion

Courtesy of AUDI OF AMERICA, LLC

-- Check the cylinder head at several locations for distortion using a Straight Edge - 500mmVAS6075 and a feeler gauge.

• Maximum permitted distortion: 0.05 mm.

Fig 6: Cylinder Head Refacing Dimension

Courtesy of AUDI OF AMERICA, LLC

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

• Minimum dimension -a- = 139.20 mm.

Fig 7: Identifying Oil Dipstick Guide Tube Bolt

Courtesy of AUDI OF AMERICA, LLC

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