Valvetrain, component overview

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Valvetrain, Component Overview

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1 - 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

2 - Sealing plug

3 - Cylinder head

Check valve guides → Valve guides, checking

4 - Support element

With hydraulic valve clearance compensation
Checking → Support elements with hydraulic adjustment, checking
Do not interchange
Lubricate contact surface

5 - Securing clip

Check for secure seat

6 - 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- 24 mm dia.: 0.024 to 0.066 mm

Radial clearance at bearing- 36 mm dia.: 0.032 to 0.078 mm
Run-out: max. 0.04 mm

7 - Bearing bracket

With integrated camshaft bearings
Removing and installing → Camshafts, removing and installing

8 - 9 Nm

9 - 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- 24 mm dia.: 0.024 to 0.066 mm

Radial clearance at bearing- 36 mm dia.: 0.032 to 0.078 mm
Run-out: max. 0.04 mm

10 - Roller rocker lever

Do not interchange
Check roller for easy movement
Lubricate contact surface
To assemble, clip onto support element - 4 - with securing clip - 5 -

11 - Valve keys

12 - Valve spring plate

13 - Valve spring

Installed location: The tight spring coils face toward cylinder head

14 - Valve stem seal

Replacing → Valve stem seals, replacing .

15 - 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