Valve Guide, Ream
Measure diameter of valve guide with dial gauge and inner micrometer (see illus. I).
Valve oversizes may already be present ex works. Oversize identification: On valve guide and valve stem end with the following code numbers/letters. See also Technical Data.
| Size Reamer | Identification | |
|---|---|---|
| Production | Service | |
| Normal | No code | K |
| 0.075 KM-664 | 1 | K1 |
| 0.150 KM-664 | 2 | K2 |
| 0.250 KM-664 | - | A |
Ream valve guide from upper side of cylinder head to next oversize (see illus. II). After reaming valve guide, cross out invalidated code and stamp in new size.
Clean valve guides carefully.