TM 5-4320-218-15
procedure.
96. Magneto Reassembly and Installation
a. Reassembly. Reassemble the magneto by
b. Installation. Refer to paragraph 66d for
referring to paragraph 94 and reversing the
installation details.
Section VII. ENGINE LUBRICATION SYSTEM
of the oil pan, and wash all parts
97. Description
removed in an approved cleaning sol-
A gear-type oil pump, driven from the idler
vent.
gear in the timing-gear train, draws oil from
(2) Brush the screen with a stiff brush
the crankcase oil sump through its filter screen.
and remove all sludge and foreign
It delivers the oil under pressure to an oil
m a t t e r from between the wires of
header, which sprays oil against fins of the con-
the screen, Dry with clean, dry com-
necting-rod caps to lubricate the rod bearing,
pressed air.
and directs oil through exterior oil lines to the
governor and bypass-type oil filter. The cylin-
(3) I n s p e c t the oil pan for dents. If
ders are lubricated by the mist from the con-
minor, smooth out with hammer and
necting rods and crankshaft. Lubrication and
a wood block. Replace the oil pan if
splash plates are installed inside the crankcase
i t is damaged beyond
serviceable
to prevent excess lubrication of the cylinder
limits.
walls. The lubrication system is protected from
d. Installation. Apply a thin coat of grease
dirt or other foreign matter by a screen over
on a new oil-pan gasket and install the oil pan
the intake of the oil pump, and by the oil fil-
in place on the crankcase with the fourteen cap
ter.
screws and lockwashers.
98. Oil Pan
99. Oil Pump
a. Description. The bottom cover plate (32,
a. Description. The oil pump is driven from
fig. 28) is also the oil pan of the engine and
the idler gear, which is located next to the mag-
also serves as an oil reservoir. The oil pan is
neto gear in the timing-gear train. The lower
provided with a pipe nipple (34) to drain the
end of the oil pump extends down into the
crankcase oil from the engine.
oil pan, and the oil is drawn into the pump
b. Removal.
for circulation under pressure to lubricate the
(1) Drain all the crankcase oil from the
components of the engine. When the engine
engine.
of the pumping unit is operating under nor-
(2) Lay the engine on its side, supporting
mal condition, oil pressure will be approxi-
it in such a manner which will prevent
mately 5 psi.
damaging the cylinder air shrouds.
b. Removal.
(3) R e m o v e the four cap screws (39)
(1) Remove the oil pan as instructed in
a n d lockwashers (40) that secure
the front and rear engine supports
(2) Remove the ten cap screws (18, fig,
(44) to the bottom of the crankcase;
28) and lockwashers (9) that secure
remove the engine supports.
the gear cover to the crankcase. Us-
(4) Remove the fourteen cap screws (33)
ing a suitable driftpin, carefully drive
and lockwashers (9) that secure the
the two dowel pins (27) out from the
crankcase bottom cover plate (32) to
gear cover; remove the gear cover
the crankcase (6); remove the cover
and the gear-cover gaskets (15) from
plate and gasket (31).
the engine and press the oil seal (19)
(5) Remove the slotted pipe plug and the
out of the gear cover.
Allenhead setscrew located beneath
(3) Remove the two cap screws (13) and
the pump in the crankcase.
the lockwashers (9) that secure the
c. Cleaning inspection.
gear-cover spacer (14) to the gear
(1) Scrape out all sludge and foreign
cover (17).
particles accumulated on the bottom
