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 (b) Operations requiring head removal.
arms. Valve guides, pressed into the cylinder head, hold
1. Grinding, reseating or replacement
valves in accurate alignment with valve seats. Top of
cylinder head, with the valve and rocker arm assembly, is
of valves (para 3-23).
inclosed by a cover.
2. Replacement of valve guides (para
(2) Cylinder head service. Service on some
parts contained in the head can be accomplished with
3. Replacement of exhaust "salve
the head installed on engine. Other service operations
seat inserts (para 3-23).
require head removal.
(3) Removal of cylinder head.
(a) Operations not requiring head removal.
(a) Remove side panels, seat deck and
1. Adjustment of valve clearance (TM
supports, battery, and battery tray (TM 10-3930-618-20).
10-3930-618-20).
(b) Drain radiator and block.
2. Replacement of rocker arms,
(c) Remove vent hose from rocker arm
rocker arm shafts, or springs (para 3-23).
cover.
3. Replace of push rods (para 3-23).
(d) Remove nut (1, fig.
3-30) and
4. Replacement of valve springs (para
washers
(2) from stud (15). Then remove cover (3)
5. Removal of spark plugs (TM 10-
and rocker arm assembly (para 3-23).
3930-618-20).
3-35
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