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Home >> Audi >> 2011 >> A8 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (4.0L - Turbocharger & Supercharger - Engine Code(S): CEUA, CGTA, CTFA & CTGA) >> 21 Turbocharger, Supercharger >> Turbocharger >> Overview - Turbocharger

Overview - Turbocharger

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NOTE:

The turbocharger for cylinder bank 2 (left) is shown in the illustration.

Fig 1: Turbocharger Overview (Left Side Shown)
GWWA21-10591Courtesy of AUDI OF AMERICA, LLC
  1. Air guide pipe
    • to turbocharger
  2. Bolt
    • 9 Nm
  3. O-Ring
    • Replacing
  4. Nut
    • Self-locking
    • Replacing
    • Tightening specifications and sequence:
  5. Turbocharger
  6. O-Rings
    • Replacing
  7. Bolt
    • 9 Nm
  8. Bolt
    • 9 Nm
  9. Coolant Supply Line
  10. O-Ring
    • Replacing
  11. Bolt
    • 9 Nm
  12. Oil supply line
  13. O-Ring
    • Replacing
  14. Support
    • For the turbocharger
  15. Bolt
    • Tightening specification and sequence, refer to Fig 4.
  16. Bolt
    • Tightening specification and sequence, refer to Fig 4.
  17. Coolant Supply Line
  18. O-Ring
    • Replacing
  19. Bolt
    • Tightening specification and sequence, refer to Fig 4.
  20. Bolt
    • 9 Nm
  21. Retaining Plate
    • for coolant and oil lines
  22. Actuator Rod
    • Always replace if removed
  23. Ball Pin
    • 2.5 Nm
    • For engine cover
  24. Bolt
    • 9 Nm
  25. Vacuum Actuator
    • For the turbocharger
  26. O-Ring
    • Replacing
  27. Connection
    • for oil return hose
  28. Bolt
    • 9 Nm
  29. Oil Return Line
  30. Seal
    • Replacing
  31. Stud Bolt
    • Install all the way into the threaded plate -32-
  32. Threaded Plate
    • for the stud bolt
    • only on the interior engine side

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

Step Bolts Tightening Specification
1. -1 to 8- 16 Nm
2. -1 to 8- 25 Nm
Fig 2: Identifying Left Turbocharger Bolt Tightening Sequence
GWWA21-10603Courtesy of AUDI OF AMERICA, LLC

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

Step Bolts Tightening Specification
1. -1 to 8- 16 Nm
2. -1 to 8- 25 Nm
Fig 3: Identifying Right Turbocharger Tightening Sequence
GWWA21-10604Courtesy of AUDI OF AMERICA, LLC

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

Step Bolts Tightening Specification
1. -1 to 3- 5 Nm
2. -1 to 3- 25 Nm

4 -

Turbocharger Support

Fig 4: Identifying Turbocharger Support Tightening Sequence
GWWA21-10706Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolt -2- to 9 Nm.

Fig 5: Identifying Engine Cover Temperature Sensor -G765-
GWWA24-11080Courtesy of AUDI OF AMERICA, LLC