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ENGINE
ENGINE DESCRIPTION
2-15
The
ball stud used with this roc
ker
ann has a
groove which aligns with the oil passage and
has drilled holes which feed oil to the
inside of
the push rod. See figure 2-10, view B.
2-6 ENGINE
LUBRICATION SYSTEM
The crankcase is filled with oil
t
hr ough
t
he
filler opening in
t
h e rocker ann
cover.
The filler
opening is covered by a
removable
combinat ion
filler and ventilating cap which
cont ains
a filter-
ing material to exclude dust.
See
figure 2-14.
The supply of oil in crankcase may be checked
by means of the removable oil gauge rod on
right
side of crankcase. The rod is
marked
"Full" and "Add Oil", and the range between
marks is two quarts.
The
engine lubrication system is of the
f
or ce-
feed type in which oil is supplied under full
pressure to crankshaft, connecting rod, and
camshaft bearings, and is supplied under con-
trolled volume to the rocker arm bearings, push
rods, and hydraulic valve lifters (where used).
All other moving parts are lubricated by grav-
ity flow or splash. See figure 2-11 or 2-13.
The supply of oil is carried in the lower
crankcase, from which it is picked up and cir-
culated by a gear type oil pump. The oil pump
inlet is equipped with a floating screen which
is
hinged
so that it follows the oil level under
all
conditions, thus drawing clean oil from near
the top above any sediment which might collect
at bottom of crankcase. See figure 2-1 or 2-13.
Should the oil pump screen become clogged due
to abnormally thick oil, sludge, or other cause.
suction of the pump will cause the screen to
collapse at its center and open a valve that will
permit oil to be drawn into the pump.
The oil pump is driven by the distributor
shaft which is driven from the camshaft
through spiral gears. It contains two helical
gears enclosed in the pump body and retained
by the oil pump cover, to which the floating oil
pump screen is attached. The oil pump body
contains a non-adjustable spr ing loaded pres-
sure valve, which regulates the oil pressure at
35 pounds at 35 MPH under normal operation.
Oil under pressure leaves the pump through
a drilled passage in pump body, which con-
nects to the main oil gallery in the right side
of crankcase. Branch passages in the crankcase
distribute oil from
t
he oil gallery to the cam-
shaft and crankshaft
bearings.
Holes drilled in
the crankshaft ca r r y oil t
o
the connecting rod
bearings.
Pistons and cylinder wall
s
are lub
ricated
by
oil forced through a small
hole
in the lower end
Figu re
2
- 1 1
-
Engi ne Lubrica t ion
System- 1948
Eng ines
(Except Ser
ies 70 having Hyd raulic
Valve Lifters)
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