Overview - Valvetrain
WARNING: This page is about a different car, the 2015 Audi A6 Quattro, 2014 Audi A6 Quattro, 2013 Audi A6, and 2012 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
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.
The cylinder head for cylinder bank 2 (left) is shown in the illustration.
- Sealing Plug
- 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, REMOVING AND INSTALLING, CYLINDER HEAD INSTALLED .
- Replacing with the cylinder head removed, refer to VALVE SHAFT SEALS, REMOVING AND INSTALLING, CYLINDER REMOVED .
- Valve Spring
- Installed position, refer to Fig 2
- Hydraulic Adjusting Element
- Clipped into roller rocker lever item -8-
- Checking, refer to HYDRAULIC ADJUSTING ELEMENTS, CHECKING .
- Mark the installed position for installation later
- Lubricate the running surfaces before installing
- Valve Spring Retainer
- Valve Keepers
- 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 item -9- with securing clip item -5-
- Clip
- Not available individually
- Make sure it is secure
- 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
- Bolt
- Replacing
- Tightening specification and sequence, refer to Fig 3.
- Guide Frame
- With integrated camshaft bearings
- Removing and installing, refer to CAMSHAFT, REMOVING AND INSTALLING .
- Flat Ring
- Flat Ring
- 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
- Oil Screen
- Intake Valve
- Do not rework, only grinding 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 .
- Exhaust Valve
- Do not rework, only grinding 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 .
- The tight spring coils -arrow- face toward the cylinder head.
NOTE:
The guide frame for the left cylinder head camshaft is shown in the illustration. The right cylinder head is identical.
Replace any bolts that were tightened with an additional turn.
-- Tighten the bolts in three steps and in the sequence shown:
| Step | Bolts | Tightening specification/additional turn |
|---|---|---|
| 1. | -1 to 21- | Install all the way in by hand.
|
| 2. | -1 to 21- | 8 Nm |
| 3. | -1 to 21- | Tighten an additional 90° |