Valve dimensions
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.
NOTE:
- Intake and exhaust valves must not be refaced by grinding. Only lapping is permitted.
| Dimension | Intake valve | Exhaust valve | |
|---|---|---|---|
| Diameter a | mm | 33.85 ± 0.10 | 28.0 ± 0.1 |
| Diameter b | mm | 5.98 ± 0.01 | 5.96 ± 0.01 |
| c | mm | 104.0 ± 0.2 | 101.9 ± 0.2 |
| α | ∠ ° | 45 | 45 |
CAUTION:
- Worn sodium-filled exhaust valves must not be scrapped without first being properly treated.
- Using a metal saw, the valves must be cut into two pieces between the shaft center and valve head. While doing this, do not come into contact with water. At the very most, throw 10 of the prepared valves into a bucket filled with water. Then, move quickly away, because a sudden chemical reaction will occur during which the sodium is burnt away.
- The treated parts may then be discarded through conventional disposal channels.