Overview - VALVETRAIN: Notes
WARNING: This page is about a different car, the 2010 Audi A5, 2009 Audi A5, and 2008 Audi A5. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Risk Of Damaging Valves And Piston Heads After Working On Valve Train.
- The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.
- To ensure valves do not strike pistons when starting, carefully rotate engine at least two full revolutions.
NOTE:
Cylinder Heads With Cracks Between The Valve Seats, Or Between The Valve Seat And The Spark Plug Threads, Can Continue To Be Used Without Reducing The Service Life, As Long As The Cracks Have A Width Of Max. 0.3 Mm, Or Only The First 4 Threads Of The Spark Plug Threads Are Cracked.
NOTE:
Cylinder Head For Cylinder Bank 2 (Left) Is Shown In Illustration.
- Sealing Plugs
- Install with sealant.
- Cylinder Head
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
- Valve Stem Seal
- Replacing with the cylinder head installed. Refer to VALVE STEM SEALS, CYLINDER HEAD INSTALLED, REMOVING AND INSTALLING .
- Replacing with the cylinder head removed. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING WITH CYLINDER HEAD REMOVED .
- Valve Spring
- Installed position. Refer to Figure
- Hydraulic Adjusting Element
- Checking. Refer to HYDRAULIC ADJUSTING ELEMENTS, CHECKING .
- Mark the installation position with paint for reinstallation
- Lubricate the running surfaces before installing
- Valve Spring Retainer
- Valve Retainer
- Roller Rocker Lever
- Different versions for the intake and exhaust side, do not interchange them
- Check roller for easy movement
- Lubricate the running surfaces before installing
- Clip to the hydraulic adjusting element -item 5- with securing clip -item 9-
- Clip
- Different versions for the intake and exhaust side, do not interchange them
- Make sure it is secure
- Intake Camshaft
- With 3 camshaft sliders
- Do not disassemble
- Axial Play, Measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
- Maximum run out: 0.04 mm
- Bolt
- Replace
- Tightening sequence. Refer to Figure
- Camshaft Adjuster Actuator
- Bolt
- 5 Nm
- O-Ring
- Replace
- Guide Frame
- With integrated camshaft bearings
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Flat Ring
- Flat Ring
- Exhaust Camshaft
- Axial Play, Measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
- Maximum run out: 0.04 mm
- Oil Screen
- Intake Valve
- Do not rework, only grinding is permitted
- Mark the installed position for installation later
- Valve dimensions VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
- Exhaust Valve
- Do not rework, only grinding is permitted
- Mark the installed position for installation later
- Valve dimensions VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .