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 TM 5-2420-224-34
CYLINDER HEAD REPAIR (CONT)
10.
INSTALL 10-mm MANDREL in exhaust valve
guide (12). Fit should be SNUG. There is NO
allowable TOLERANCE.
11.
REPEAT STEPS 9 and 10 for each exhaust
valve guide.
NOTE
Perform steps 12 thru 16 only if fit
was not snug in steps 7 and 10.
12. USING REMOVAL TOOL and DRIFT PIN,
REMOVE intake and exhaust valve GUIDES
(11 and 12).
CAUTION
Do not ream through thickness
valve
of
the
seat as
counterbore will be damaged.
Leave 0.0394-in.
(1-mm)
thickness.
13. REAM valve SEAT (13) to REMOVE seating
FACE.
14. UNDERCUT valve SEAT (13) as shown.
13-4
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