Overview - VALVETRAIN
WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, 2013 Audi Q7, 2012 Audi Q7, and 2011 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
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, 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 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 CAMSHAFTS, REMOVING AND INSTALLING
- Axial play, measuring. Refer to CAMSHAFTS, CHECKING AXIAL CLEARANCE
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE
- Maximum run-out: 0.04 mm
- Bolt
- Replace
- Tightening specification and sequence. Refer to Fig 3
- Guide Frame
- With integrated camshaft bearings
- Removing and installing. Refer to CAMSHAFTS, REMOVING AND INSTALLING
- Flat Ring
- Flat Ring
- Exhaust Camshaft
- Removing and installing. Refer to CAMSHAFTS, REMOVING AND INSTALLING
- Axial play, measuring. Refer to CAMSHAFTS, CHECKING AXIAL CLEARANCE
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE
- Maximum run-out: 0.04 mm
- Oil Screen
- Installed depending on the version.
- 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
- 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
- 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 90° additional turn |