Overview - Turbocharger, Part 1

1. O-Ring
   • Replace after removing
2. Turbocharger Recirculation Valve -N249-
   • Assembly is only possible in one position because of the offset holes
   • Removing and Installing. Refer to Turbocharger Recirculating Valve -N249-, REMOVING AND INSTALLING .
3. Bolt
   • 9 Nm
4. O-Ring
   • Replace after removing
   • Coat with coolant
5. Bolt
   • 9 Nm
6. Coolant Return Line
7. Locking Spring
   • Replace after removing
8. Ball Socket
9. Charge Air Pressure Control Module -GX34-
   • Removing and Installing. Refer to Charge Air Pressure Control Module -GX34-, REMOVING AND INSTALLING .
10. Nut
    • 8 Nm
11. Control Rod
12. Nut
    • 8 Nm
13. Locking Spring
    • Replace after removing
14. Ball Socket
15. Bolt
    • 8.5 Nm
16. Locking Plate
    • Replace after removing
    • Quantity: 2
    • Installing. Refer to Fig 4.
17. Nut
    • Replace after removing
    • Coat the threaded pins with hot bolt paste. Refer to the Electronic Parts Information (ETKA).
    • Tightening specification and sequence. Refer to Fig 3.
18. Seal
    • Replace after removing
19. Threaded Pin
    • Screw-in depth and tightening specification. Refer to Fig 2.
20. Turbocharger
    • Removing and Installing. Refer to TURBOCHARGER, REMOVING AND INSTALLING .
21. O-Ring
    • Replace after removing
    • Coat with engine oil
22. Oil Return Line
23. O-Ring
    • Replace after removing
    • Coat with engine oil
24. Bolt
    • 25 Nm
25. Bolt
    • 9 Nm

Check the Screw-in Depth of the Threaded Pin

-- Tighten the threaded pin -1- to 23 Nm.

-- Measure the dimension -a- of the sealing surface of the cylinder head to the collar on the threaded pin.

• At dimension -a- less than or equal to 2.4 mm: tightening specification 23 Nm OK
• At dimension -a- more than 2.4 mm: tightening specification 27 Nm.

Turbocharger - Tightening Specification and Sequence 

• Replace the nuts after removing.

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

Step	Nuts	Tightening Specifications
1.	-1 to 4-	Install all the way by hand
2.	-1 and 2-	10 Nm
3.	-3 and 4-	25 Nm
4.	-1 and 2-	25 Nm

Install the Locking Plates

• Pay attention to distortion of the sprockets.

The locking plates are pressed onto the nuts using the following tools:

• Pry bar
• ¹ /₂ "- EGR Temp. Sensor Socket - 14mm with extension
• Hammer
• Wrench - 14 mm

-- Press on the locking plates for easy accessible nuts using the ¹ /₂ "- EGR Temp. Sensor Socket - 14mm with extension and the hammer.

-- Press on the locking plates for difficult accessible nuts using the Wrench - 14 mm and the pry bar, at the same time support the pry bar on the turbocharger.