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TM 5-4320-306-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
REPAIR:
1
Repair valve seat insert rings (1)
CAUTION
Do not damage cylinder head.
a. Insert valve seat ring mandrel No. 122450 (2) into cylinder head (3) Clamp down valve seat ring mandrel and
cylinder head into milling lathe (4) and bore out valve seat insert rings with milling cutter No. 122463 (5) Take
care not to bore into cylinder head counterbore (6)
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