ARMY TM 9-6115-464-34
AIR FORCE 35C2-3-445-2
NAVY NAVFAC P-8-624-34
(n) Make ten or twelve pencil marks, equally spaced, across valve seat.
(o) Install valve, press firmly, and rotate approximately one quarter of a turn.
(P) Remove valve and observe pencil marks. If marks are rubbed out, valve is seating properly. If all
pencil marks are not rubbed out, repeat grinding process.
CAUTION
Mark each valve to insure that it will be installed in the seat into which it was ground.
Failure to observe this caution could result in equipment damage.
(q) Repeat grinding process for each valve.
d. Assembly.
(1) Lubricate stem of intake valves (29) and exhaust valves (28) and insert into valve guides (31 and
32).
(2) Install bonnets (30), valve springs (26 and 27), spring seats (24 and 25) and locks (22 and 23).
NOTE
Bonnets are installed on intake valves only.
(3) Assemble rocker arm assembly as follows:
(a) Install adjusting screws (19) into rocker arms (17).
(b) Assemble springs (18), rocker arms (17), spacers (16) and mounting blocks (13,14, 15, and 22)
onto rocker arm shaft (20). Make sure that mounting blocks and spacers are correctly installed
(figure 3-47) and that oil holes in rocker arm shaft are correctly positioned (figure 3-48).
(c) Install retaining rings (12).
e. Installation.
(1) Install cylinder head and rocker arm assembly in reverse order of removal procedures.
(2) Tighten nuts to 75 Ibs.-ft. torque following the sequence of figure 3-49.
(3) Repeat the sequence, tightening each nut to 125 Ibs.–ft. torque.
(4) Again repeat the sequence, tightening each nut to a final torque of 160 Ibs.-ft. for 9/16 in. DIA stubs
and 175 Ibs.-ft. for 5/8 in. DIA studs, as specifies in paragraph 1-6v.
NOTE
Nuts must be retorqued after 1 hour operation.
(5) Refer to the Operator and Unit Maintenance Manual and adjust the valve tappet clearance to a
“HOT” setting of 0.015 inch.
3-114
