Overview - Cylinder Head

1. 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.
   • Perform the adaptation after replacing using the Vehicle Diagnostic Tester Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
2. Alignment Pin
   • Quantity: 2.
3. Cylinder Head
   • Removing and Installing. Refer to CYLINDER HEAD, REMOVING AND INSTALLING .
   • Checking for distortion. Refer to Fig 5
   • Do not rework the upper sealing surface.
   • Only replace together with the cylinder head cover.
   • Change the coolant and engine oil after replacing.
   • Cap installation and installation position. Refer to Fig 6
   • After removing and installing or replacing, perform the adaptation. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
4. Bolt
   • Replace after removing.
   • Loosening. Refer to Fig 2
   • Tightening specification and sequence. Refer to Fig 3
5. Heat Shield
   • There are different versions. Refer to the Parts Information for the allocation.
6. Bolt
   • First tightening 5 Nm.
   • Second tightening 9 Nm.
7. O-Ring
   • Replace after removing.
   • Coat with coolant.
8. Bolt
   • 9 Nm.
9. Connection
   • For coolant hose.
10. Bolt
    • Replace after removing.
    • Loosening. Refer to Fig 2
    • Tightening Specifications and Sequence. Refer to Fig 3
11. O-Ring
    • Replace after removing.
    • Coat with coolant.
12. Bolt
    • 9 Nm.
13. Connection
    • For coolant hose.
14. Engine Lifting Eye
15. Bolt
    • 10 Nm +90°.
    • Replace after removing.
16. Partition Plate
17. Engine Lifting Eye
18. Bolt
    • 10 Nm +90°.
    • Replace after removing.

Loosening the cylinder head 

-- Remove the bolts -arrows-.

-- Loosen and remove the cylinder head bolts in the sequence -1 to 10-.

Cylinder Head - Tightening Specifications and Sequence 

• Replace bolts that were tightened with an additional turn after removing them.
• Bolt differences: 
• Bolt without collar.
• Bolt with collar -arrow-.

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

Step	Bolts	Tightening Specification/Additional Turn
1.	-1 through 10-	Install all the way by hand
2.	-1 through 10-	"Without the collar" 40 Nm "With the collar" 50 Nm; refer to OVERVIEW - CYLINDER HEAD - Bolt differences:  for the difference
3.	-1 through 10-	90° additional turn
4.	-1 through 10-	90° additional turn
5.	-arrows-	8 Nm
6.	-arrows-	90° additional turn

Cylinder Head, Checking for Distortion 

-- Check the cylinder head at several locations for distortion using a Straight Edge - 500mm: VAS6075  and a feeler gauge.

• Maximum permitted distortion: 0.05 mm

Cap installation and installation position 

-- Before removing, determine the press-in depth -a-.

-- Coat the cap -1- all around with sealant. Refer to Parts Information.

-- Position the cap -1- parallel to the cylinder block and using a suitable thrust piece (for example the socket) -2- drive in to the previously determined press-in depth -a-.

Courtesy of AUDI OF AMERICA, LLC