Overview - VALVETRAIN: Notes
WARNING: This page is about a different car, the 2018 Audi A6 Quattro, 2017 Audi A6 Quattro, and 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Cylinder heads with cracks between valve seats or between valve seat and spark plug thread can still be used without loss of service life if the cracks are minute (max. 0.3 mm width) or only the first four threads of a spark plug thread are cracked.
The cylinder head for cylinder bank 2 (left) is shown in the illustration.
- Exhaust Valve
- Do not rework, only lapping is permitted
- Mark the installed position for installation later
- Checking. Refer to VALVES, CHECKING .
- Valve dimensions. Refer to VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
- Sealing Plugs
- Install with sealant. Refer to the parts information.
- Cylinder Head
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
- Valve Stem Seal
- Removing and installing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
- Valve Spring
- Installed position.
- Valve Spring Retainer
- Valve Keepers
- Hydraulic Adjuster
- Clipped into roller rocker lever -8-
- Checking. Refer to HYDRAULIC ADJUSTING ELEMENTS, CHECKING .
- Mark the installed position for installation later
- Lubricate the running surfaces before installing
- Clip
- Not available individually
- Make sure it is secure
- Roller Rocker Lever
- Mark the installed position for installation later
- Check roller for easy movement
- Lubricate the running surfaces before installing
- To assemble, clip onto the hydraulic adjusting element -9- with securing clip -5-
- Bolt
- Replace after removing
- Tightening specification and sequence. .
- Guide Frame
- With integrated camshaft bearings
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Bolt
- 5 Nm
- Camshaft Adjustment Valve 2 -N208-
- Cylinder bank 1 (right) Camshaft Adjustment Valve 1 -N205-
- Removing and installing. Refer to CAMSHAFT ADJUSTER VALVES, REMOVING AND INSTALLING .
- O-ring
- Replace after removing
- Bolt
- 5 Nm
- Exhaust Camshaft Adjustment Valve 2 -N318-
- Cylinder bank 1 (right) Exhaust Camshaft Control Valve 1 -N318-
- Removing and installing. Refer to CAMSHAFT ADJUSTER VALVES, REMOVING AND INSTALLING .
- O-ring
- Replace after removing
- Flat Ring
- 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
- Compression Rings
- Depending on the version one or two are installed. Refer to the parts information for the allocation.
- 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
- Banjo Bolt
- 25 Nm
- With valve
- Oil Pipe
- Intake Valve
- Do not rework, only lapping is permitted
- Mark the installed position for installation later
- Checking. Refer to VALVES, CHECKING .
- Valve dimensions. Refer to VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .