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TM 5-4320-305-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
b. An alternate method to remove valve seat insert
rings is by using a drill press. Position drill fixture
No. 122460 (1) on a drill press (2).Place cylinder
head (3) on drill fixture. Insert pilot pin with
drilling bushings No. 122461 (4) on cylinder head
(3).
Drill out the valve seat insert rings using hard metal milling
cutter No. 122463 (1).
WARNING
Use care when handling heated parts.
NOTE
Valve seat insert rings are inserted and seated from bottom of
cylinder head which has been heated to 428°F (220°C).
c. Heat cylinder head to 428° F (220°C) in furnace.
4-52
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