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ENGINE
ENGINE DESCRIPTION
2-17
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Figure 2-13-Eng
ine
lubrication System-1949 Engines
(Also 1948 Series 70 Having Hydraulic Valve liftersl
2-7 CRANKCASE VENTILATION SYSTEM
A
crankcase
vent ilato r inl
et,
containing a
gauze filt
er
eleme nt , and an
outlet
suction pipe
are used
to
provid e crankcase ventilation. Ven
-
til
ation
of
the
crankcase is ac
complished by
th
e
va cuum
created by
the
outlet pipe.
The outlet pipe is
connected
to
the
push rod
cover,
and exte nd s r
earward
at a low
level
on
right sid
e
of engine . Suct ion
created by
air
passing th
e open
end
of the
outlet
pipe,
when
car is moving
forward, causes
air to be drawn
into crankcase
through the
crankcase
inl
et,
and
into th
e
rocker arm
cover
through a
ventilating
type
oil
filler
cap which contains a gauze filter-
ing element. Th
e ventilating streams
of air are
drawn out of
crankcas e
and rocker arm cover
through
the
push rod compartment and outlet
pipe. See figure 2-14.
The ai
r
passing
through
t
he cr ankcase, push
rod
compartmen t , and rocker
arm
cover
pi
cks
up fuel and
water va
po rs and removes
them
from the
engine.
Th
e
ventilat ing
system does
not remove all fuel dilution in cold weather as
a small amount is advantageous in low tem-
perature
operation.
It
does
,
however, prevent
an accumulation of more than 20
%
fuel dilu-
tion and removes all water under average driv-
ing conditions.
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OUTLET
Fig ur e
2-
14-Cra nkcase Ventilation, Sectional View
2-8 ENGINE COOLING SYSTEM
The engine water cooling system is the pres-
sure
type,
with thermostatic water temperature
control and water pump circulation. A fan
located behind the radiator provides air cir-
culation.
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