VALVE RECONDITIONING CONTINUED
8. After refacing each valve-inspect stem. If wear is noticeable, but not too severe, reface end of stem with
attachment usually provided with valve grinding equipment (Figure 10). Grind sufficiently to tune-up end of
9. Check valve face runout and head margin after refacing. Maximum face runout in reference to valve stem must
be less than 0.002 in. (0.05 mm) total variation in dial indicator reading. Head margin must be at least one half
(50 percent) of new valve of same type.
Figure 10. Refacing Valve Stem End.