Valvetrain, assembly overview: Notes
WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, and 2007 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Cylinder head for cylinder bank 2 (left) is shown in illustration.
1 - Sealing plug
2 - Valve stem seal
- Replacing → Valve stem seals, replacing .
3 - Valve spring
- Installed location → Installed position of valve spring
4 - Support element
- With hydraulic valve clearance compensation
- Clipped into roller rocker lever - 8 -
- Checking → Support elements with hydraulic adjustment, checking
- Mark for re-installation
- Lubricate contact surface
5 - Valve spring plate
6 - Valve keys
7 - Securing clip
- Check for secure seat
8 - Roller rocker lever
- Mark for re-installation
- Check roller for easy movement
- Lubricate contact surface
- To assemble, clip onto support element - 4 - with securing clip - 7 -
9 - Intake camshaft
- Removing and installing → Camshafts, removing and installing
- Measuring axial play → Camshaft axial play, measuring
- Measure radial clearance using Plastigage (roller rocker lever removed)
- Radial clearance at bearing-dia. 24 mm: 0.024 to 0.066 mm
- Radial clearance at bearing-dia. 36 mm: 0.032 to 0.078 mm
- Run-out: maximum 0.04 mm
10 - Gasket
- Replace
11 - Bearing bracket
- With integrated camshaft bearings
- Removing and installing → Camshafts, removing and installing
12 - Bolt
- Tightening order → Bearing frame tightening sequence
13 - Camshaft position (CMP) sensor 2 G163
14 - Bolt
- 9 Nm
15 - O-ring
- Replace
16 - Bolt
- 9 Nm
17 - Camshaft position (CMP) sensor 4 G301
18 - O-ring
- Replace
19 - Compression ring
- For camshaft adjuster
20 - Exhaust camshaft
- Removing and installing → Camshafts, removing and installing
- Measuring axial play → Camshaft axial play, measuring
- Measure radial clearance using Plastigage (roller rocker lever removed)
- Radial clearance at bearing-dia. 24 mm: 0.024 to 0.066 mm
- Radial clearance at bearing-dia. 36 mm: 0.032 to 0.078 mm
- Run-out: maximum 0.04 mm
21 - Cylinder head
- Check valve guides → Valve guides, checking
22 - Intake valve
- Do not rework, only lapping is permitted
- Mark installed position for re-installation
- Valve dimensions → Valve dimensions
- Check valve guides → Valve guides, checking
23 - Exhaust valve
- Do not rework, only lapping is permitted
- Mark installed position for re-installation
- Valve dimensions → Valve dimensions
- Check valve guides → Valve guides, checking