TM 5-4310-354-14
Section VI. ROCKER ARM, CYLINDER HEAD, AND VALVE ASSEMBLIES
7-11. General. The rocker arm assembly is mounted
for water flow to promote cooling of the head. The
on top of the cylinder head to operate the intake and
intake and exhaust valves operate in valve guides
exhaust valves. The rocker arms are pivoted on the
pressed into the cylinder head. They are held to their
rocker arm shaft by the camshaft-operated push rods
seats by springs which are secured to the valves by
which engage one end of the rocker arms. As the rocker
spring seats and valve locks. The valves are operated
arms raise at one end, the opposite end pushes down on
by conventional-type tappets with hollow pushrods
the ends of the valve stems to open the valves. In this
running from the tappets to the rocker arms.
manner, the valves control the intake and exhaust cycles
of the engine. The rocker arms are pressure lubricated
7-12. Rocker Arm Assembly.
through an axial passage in the rocker arm shaft. The
cylinder head is a one-piece casting which mounts the
a. Removal and Disassembly.
valves and rocker arms and provides inlet and outlet
passage to and from the valves. The valve seats are
(1) Remove the lock nuts (1, figure 7-35) and
formed as part of the casting. The valve guides are
washers (2, 3) that secure cylinder head
removable. The cylinder head contains cored passages
cover (4). Remove the cover (4) and
gasket (15).
7-37
