Overview - Camshaft Housing

1. Bearing Cap
   • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
   • Pay attention to the camshaft housing pairing number and bearing cap. Refer to Fig 6.
2. Alignment Sleeves
3. Axial Bearing
4. Seal
   • Replace after removing
5. Plugs
   • Replace after removing
6. Bolt
   • Tightening specification. Refer to OVERVIEW - VACUUM PUMP (4M) , OVERVIEW - VACUUM PUMP (4MN) .
7. Bracket
   • For the lines
   • There are different versions. Refer to the appropriate Electronic Parts Information.
8. Bolt
   • Tightening specification. Refer to OVERVIEW - VACUUM PUMP (4M) , OVERVIEW - VACUUM PUMP (4MN) .
9. Bolt
   • Tightening Specifications and Sequence:
     • Cylinder bank 1 (right). Refer to Fig 2.
     • Cylinder bank 2 (left). Refer to Fig 3.
10. Bolt
    • 9 Nm
11. Ball Pin
    • 9 Nm
12. Heat Shield
13. Bolt
    • 5 Nm
14. Cam Actuator
    • Removing and Installing. Refer to CAM ACTUATOR, REMOVING AND INSTALLING .
15. O-Ring
    • Included in a delivery package  OVERVIEW - CAMSHAFT HOUSING, cannot be delivered separately
    • coat with engine oil
    • Check for damage
16. Connection
17. Bolt
    • Tightening specification. Refer to .
18. Camshaft Housing
    • Shown for cylinder bank 2 (left)
    • Removing and Installing. Refer to CAMSHAFT HOUSING, REMOVING AND INSTALLING .
    • Pay attention to the camshaft housing pairing number and bearing cap. Refer to Fig 6.
    • Pay attention to the camshaft housing pairing number and cylinder head. Refer to Fig 5.
19. O-Ring
    • Replace after removing
20. Choke Valve
    • For the oil separator
21. Exhaust Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Axial play, measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
    • Maximum run out: 0.04 mm
22. Axial Bearing
23. Intake Camshaft
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Axial play, measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
    • Maximum run out: 0.04 mm
24. Alignment Sleeves
25. Bearing Cap
    • Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
    • Pay attention to the camshaft housing pairing number and bearing cap. Refer to Fig 6.
26. Bolts
    • Replace after removing
    • Tightening Specifications and Sequence. Refer to Fig 4.

Cylinder Bank 1 (Right) Camshaft Housing - Tightening Specification and Sequence

• These multiple tightenings to 9 Nm take into account the shrinkage of the components.

-- Tighten the bolts in steps as shown:

Step	Bolts	Tightening Specification
1.	-1 through 24-	Install all the way by hand The camshaft housing contact surface must lay entirely on top of the cylinder head
2.	-1 through 24-	9 Nm
3.	-1 through 24-	9 Nm

Cylinder Bank 2 (Left) Camshaft Housing - Tightening Specification and Sequence

• These multiple tightenings to 9 Nm take into account the shrinkage of the components.

-- Tighten the bolts in steps as shown:

Step	Bolts	Tightening Specification
1.	-1 through 24-	Install all the way by hand The camshaft housing contact surface must lay entirely on top of the cylinder head
2.	-1 through 24-	9 Nm
3.	-1 through 24-	9 Nm

Camshafts bearing cap - tightening specification and sequence

Cylinder bank 1 (right) is shown.

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

-- Tighten the bolts in steps as shown:

Exhaust camshaft -6-

Step	Bolts	Tightening specification/additional turn
1.	-1 through 5-	Install all the way by hand The bearing cap must contact the entire contact surface of the camshaft housing.
2.	-1 through 5-	3 Nm
3.	-1 through 5-	30° additional turn

Intake camshaft -7-

Step	Bolts	Tightening specification/additional turn
1.	-8 through 12-	Install all the way by hand The bearing cap must contact the entire contact surface of the camshaft housing.
2.	-8 through 12-	3 Nm
3.	-8 through 12-	30° additional turn

Camshaft housing and cylinder head pairing number

Shown on the cylinder bank 2 (left).

• Both four digit numbers must align: XXXX = XXXX.
• Each camshaft housing is assigned to a cylinder head with this pairing number.
• For the assembly pay attention to the correct allocation.

Bearing cap and camshaft housing pairing number

Shown on the cylinder bank 2 (left).

• The three digit numbers -2- on the bearing cap -arrows- must align with the last three digits of the four digit number -1- on the camshaft housing.
• Each bearing cap is assigned to a camshaft housing with this pairing number.
• For the assembly pay attention to the correct allocation.

Plug - Tightening Specification

• Component Location: in Cylinder Bank 1 (Right) Camshaft Housing

-- Tighten the plug -arrow- with a new seal to 15 Nm. (Shown on Audi A8).