TM 5-3810-289-34
(d) Splits or cracks may be welded except
action on shaft, replace with new rocker lever shaft.
on sealing area.
(j) Examine rocker lever shaft bearings for
(2) Crank cause breather.
cracks, breaks and stripped threads.
Replace as
(a) Inspect rubber washers and gaskets;
necessary.
replace as necessary.
Caution:
Do not attempt to clean paper
elements.
(b) Clean all parts in solvent. Use solver
that is not harmful to rubber.
(c)
Dry thoroughly with moisture-free
compressed air.
(3) Rocker arm assembly.
(a) Clean all parts in cleaning solvent.
(b) Blow out lubricating oil passages with
compressed air.
(c) Check for surface imperfections by
magnetic inspection.
Apply coil magnetization,
amperage at 300 to 500. See figure 3-138 for most likely
areas.
(d) The ball end of rocker lever adjusting
screw must be a true sphere. Test with /4 inch radius
gage. Replace if flat at bottom or there is evidence of
Figure 3-139. Checking rocker lever adjusting screw ball
scratching or galling, figure 3-139.
end.
(e) Examine injector rocker lever sockets for
a true fit on injector links. Check sockets with a radius
(k) Visually check surfaces which mate with
gage or by observation of a small protrusion at bottom of
adjacent levers. If galled, restore surfaces to original
socket. Pull and discard damaged or badly worn injector
smoothness.
rocker lever sockets. If socket is broken press out by
d. Assembly.
drilling a small hole in lever above socket; after socket is
(1) Cylinder head cover.
removed, weld hole closed or install and stake plug in
(a) Install clean breather element.
hole.
(b) Install new or usable filler cap.
(f)
Check rocker lever bushings for
(c) Reconnect vapor tube, when used.
scratches, pitting or scoring. Check rocker lever bushing
(2) Crankcase breather.
inside diameter with inside micrometers.
(a) Install new element over center screw in
(g) If steel bushing exceeds 1.1275 inch
breather housing.
press out and replace with new bushing.
(b) Place cover on housing with gasket in
(h) Check intake and exhaust rocker lever
position.
valve contact surfaces. If worn or damaged, grind to
(c)
Install gasket, flatwasher and nut.
original contour or replace with new rocker lever
Tighten securely.
(i) Check rocker lever shaft for wear or
(3) Rocker arm assembly.
scoring.
(a) If rocker lever bushings were found
If shaft ha s shoulders or ridges due to rocker lever
unserviceable, press out with ST-691 (1, fig. 3-140).
Aline oil hole in precision steel bushing (2) and oil hole in
rocker lever and press bushing in with ST-691. Locate
bushing so split is not at bottom or load area in lever.
Check lever over shaft to make sure bushing has not
"collapsed". Rocker lever assembly is lubricated through
oil holes in shaft and in center bearing which indexes
with oil passage in block. Oil line dowel pin in cylinder
head indexes with center bearing.
(b) Install oil transfer dowels in end rocker
lever shaft bearings (fig. 3-141);
(c) Install rocker lever socket in injector
rocker levers.
Figure 3-138. Magnetic inspection crack indication.
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