TM 5-4320-302-14
6-9. VALVES, VALVE GUIDES, AND VALVE SEATS (CONT)
Location/Item
Action
Remarks
NOTE
Valve seat insert rings are inserted and seated from bottom of
cylinder head which has been heated to 428°F (220°C).
11. Valve seat
Insert and evenly seat new valve seat insert rings
insert rings
with valve seat ring mandrel No. 123950/123960.
NOTE
When installing oversized valve seat insert rings, make sure to
enlarge counterbore in cylinder head with precision borer in
accordance with dimensions given below.
12. Oversized
If required for replacement, valve seat insert rings
valve seat
are available in nominal size and three oversizes:
insert rings
6-56