TM 5-4320-302-146-9. VALVES, VALVE GUIDES, AND VALVE SEATS (CONT)Location/ItemAction RemarksNOTEValve seat insert rings are inserted and seated from bottom ofcylinder head which has been heated to 428°F (220°C).11. Valve seatInsert and evenly seat new valve seat insert ringsinsert ringswith valve seat ring mandrel No. 123950/123960.NOTEWhen installing oversized valve seat insert rings, make sure toenlarge counterbore in cylinder head with precision borer inaccordance with dimensions given below.12. OversizedIf required for replacement, valve seat insert ringsvalve seatare available in nominal size and three oversizes:insert rings6-56
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