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 TM 5-2420-224-34
CYLINDER HEAD REPAIR (CONT)
5.
USING 9-mm and 10-mm REAMERS, REAM
all new valve GUIDES (3).
6.
AFTER REAMING, USING 9-mm and 10-mm
MANDRELS, CHECK valve GUIDES (3).
NOTE
Make sure valve guides are within
s p e c i f i c a t i o n s , or new, before
checking valve seat counterbore
irregularity. The common center is
lost when new guides are
installed. Therefore, check valve
seat counterbore irregularity
whenever valve guides are
replaced, and reface counterbores
as necessary.
7.
INSTALL each VALVE (4) in its guide. USING
G A U G E , MEASURE DISTANCE between
valve (4) face and cylinder head (2).
ACCEPTABLE DISTANCE is 0.028-0.047 in.
(0.7-1.2 mm).
13-9
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