Valvetrain, component overview: Notes
WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. 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
- Do not interchange
- Lubricate contact surface
5 - Valve spring plate
6 - Valve keepers
7 - Securing clip
- Check for secure seat
8 - Roller rocker lever
- Do not interchange
- 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
- Checking axial play → Camshafts, checking axial clearance
- Check 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: max. 0.04 mm
10 - Gasket
- Replace
11 - Bearing bracket
- With integrated camshaft bearings
- Removing and installing → Camshafts, removing and installing
12 - 8 Nm
- Observe tightening sequence → Camshafts, removing and installing
13 - Camshaft position (CMP) sensor 2 G163
14 - 9 Nm
15 - O-ring
- Replace
16 - 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
- Checking axial play → Camshafts, checking axial clearance
- Check 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: max. 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