| Reworking can be carried out by hand while complying with the following conditions: |
| l
| Wear limit of valve guides must not exceed the permissible dimension → Chapter. |
| l
| Use NAC milling cutter with carbide metal tips (min. 90 HRC). |
| l
| Mill with the milling cutter using slight pressure in such a way that an even removal of swarfs is ensured over the whole working surface. |
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