TM 10-4320-318-14
4-30. MAINTENANCE OF ROCKER ARM ASSEMBLY.
This task covers:
Adjust
INITIAL SETUP
Tools
Equipment Conditions
General Mechanics Tool Kit
Pump unit is shut down with engine cold (para.2-8).
(Item 1, Appendix B)
Valve cover removed (para.4-29).
Box Wrench
(Item 11, Appendix B)
ADJUST (Figure 4-17).
(1) Adjust valve tappets as follows:
(a)
(b)
(c)
(d)
(e)
(f
(g)
(h)
Place decompression lever in position 0 (Figure 4-17).
Figure 4-17. Decompression Lever
Use hand crank to turn engine until compression resistance can be felt and rocker arms are loose.
If no compression is felt after 2 revolutions of handcrank, back off one turn on adjusting screw (5)
and repeat step (b).
Insert 0.004 in. (0.10 mm) feeler gage (1, Figure 4-18) between rocker arm (2) and valve stem (3)
to check clearance of gap.
If gap is incorrect, loosen nut (4) while holding adjusting screw (5).
Turn adjusting screw (5) until light pressure is felt as feeler gage (1) is moved back and forth.
Tighten nut (4) while holding adjusting screw (5). Recheck adjustment and readjust if necessary.
Repeat steps (d) through (g) for other valve.
4-39
