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TM 5-4320-305-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
d. Insert and evenly seat in bottom of cylinder head (1) new valve seat insert rings (2) with valve seat
ring mandrel No. 123950 (3) or 123960 (4).
NOTE
If both valve seat inserts and valve guides need to be
repaired, valve guides should be repaired at the same time
as the valve seat inserts as long as the cylinder head is
heated to 428°F (220°C).
e. If valve guides are to be repaired, repair them now according to REPAIR procedure 2 before
continuing with valve seat insert repair.
f. Allow cylinder head to cool to room temperature, 75°F (23.9°C).
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