TM 5-4310-354-14
thin coating of compound and continue
NOTE
grinding until inspection shows the
surfaces are in contact.
Make certain that the valves are
reinstalled in the same position from
(d) Wipe off all heavy compound, apply a thin
which they were removed. If valves
coating of fine compound, and continue
were reground, it is imperative that
the grinding.
the valves be assembled in the same
seats to which they were ground.
(e) When the surfaces show a bright ,
silverlike band of uniform width on both
(1) Valves. Reassemble the valves (40, 41) in the
the valve and seat, clean off all traces of
cylinder head (24) as follows:
the compound.
(a) Thoroughly clean all traces of grinding
(f) Test each valve for a tight fit as follows:
compound from the valves, stems, and
Make 10 or 12 pencil marks, equally
guides. Lubricate the valve stems with a
spaced, across the valve seat. Firmly
few drops of engine oil and insert the
rotate the valve in the seat for a part of a
valves in the same holes from which they
turn and again lift out the valve to observe
were removed.
if all the pencil marks are rubbed out on
the contact surface. If not, regrind until
(b) Insert the intake valve stem seals (42)
this test shows a gas-tight mating of the
over the ends on the intake valves (40)
valve and seat.
and secure firmly on the exposed ends of
the valve guides (43).
(16) Test the valve springs (39, figure 7-35) as
follows:
(c) Install the valve springs (39) and spring
seats (38) on the valve stems. Using a
(a) Check the free length of the valve springs,
valve spring compressor, compress the
intake and exhaust.
The free length
valve springs (39) and install the valve
should be 1.796 to 1.836 inches (45.62 to
locks (37).
46.63 mm).
(d) Turn the head on the exhaust manifold
(b) Apply a test load of 72 to 82 pounds
side and pour solvent in the intake
(32.66 to 37.20 kg). Check the length of
openings. If solvent seeps out around any
the springs under this test load. Length
valve, remove that valve and regrind it.
should be 1.492 inches (37.90 mm).
Repeat the test, pouring solvent in the
exhaust opening. If any exhaust valve
(c) Increase the test load to 163 to 180
leaks, regrind it.
pounds (73.94 to 81.65 kg). Length of
springs should be 1.082 inches (27.48
(e) When assured of gas-tight valve seating,
mm).
assemble the remaining components of
the cylinder head assembly.
(d) Valve springs that do not meet the above
specifications shall be replaced.
(f) Make certain plug (36) is installed, if
removed at disassembly.
Reassemble
(17) Inspect all other parts for cracks, distortion,
thermostat (35), gasket (34), thermostat
damaged threads, and other damage. Replace
housing (33), and attach with lock
any damaged parts.
washers (32) and cap screws (31, 30).
c. Reassembly and Installation. Reassemble the
(g) Reassemble gasket (29), water outlet
cylinder head assembly and valves in reverse numerical
cover (28), and attach with lock washers
sequence shown in figure 7-35, items 51 through 19,
(27) and cap screws (26). Check that pipe
and the following:
7-44
