Calculating maximum permissible refacing dimension
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
- Insert valve and press it firmly against valve seat.
NOTE:
- If valve is to be replaced as part of a repair, use a new valve for calculation.
Fig 1: Measuring Distance Between Valve Stem End (Upper Edge) And Top Surface Of Cylinder Head Using Depth Gauge
- Measure distance - a - between valve stem end (upper edge) and top surface of cylinder head using a depth gauge.
- Calculate max. permissible refacing dimension from measured distance and minimum dimension.
| Minimum dimension | ||
|---|---|---|
| Outer intake valves | Center intake valves | Exhaust valves |
| 31.0 mm | 32.2 mm | 31.9 mm |
Measured distance minus minimum dimension = maximum permissible refacing dimension.
| Example for outer intake valve: | |||
|---|---|---|---|
| Measured distance | 31.4 mm | ||
| - | Minimum dimension | - 31.0 mm | |
| = | Max. permissible refacing dimension | = 0.4 mm | |
NOTE:
- If the max. permissible refacing dimension is 0 mm or less than 0 mm, repeat the measurement with new valve. If the measured result is again 0 mm or less than 0 mm, replace the cylinder head.