The~mostat
;'9--'
Thermostat.
housing,;
10-,.-Cylind~r
heactJ.r~~l.cP~fM~;li/
~;rf~liw~r
block;
12--Cylinder
liner;
13--Cylinder
head;
14-Water
temperature
g~:P~7~=
. -
.,!.~.
'1_:"'.
1).
Construction
and
Features
The
close
type
(or
open
type)
£orc~edcircuJatiQn.w~t(·j:
~
COQli~g
..•
'.
'.
.',
",
,'"
,,~
l
'.1_'','
.)
!,,;:-
ivi
'<-i
["!1t,
',~
system
is
adopted
in
the
engine.
-'
The
cooling
water
is
sucked
in
through
.Jp~·:!~~~111?~,~J?f
jn~~~t
hose
of
the
radiator
and
forced
by
the
waterplJmpintot~l
Ol&in
, ' " .
,','
,
',;..
:';
",',:,
!
,'co
1
>*
':,j\~L}:;
11:'Y
:'t!
,J
water
passage
located
at
the
upper
side"
()fth~pTJiflft~rl:~h)<f~,~,,,f\
portion
of
the
wate~entersi?to
.the
.~ylinderblpc~\t,h.t0M.i,f
four
small
holes
to
cool
the
cylinder
liners.l·h~
remain~:pa~~h~jlh.JH\l~?
four
holes
of
different
diameter
and
enters
into
the
cylinder
head.
The
guide
plates
provided
within
the
cylinder
head
make
the
water
coolant
flow
concentrately
through
the
triangula.r
z9nes·among
the
. "
f:
f
swirl
chan1ber,
the
air
intake
port
and
the
exha.ust
port.'
The
heate-d
, -
water
flows
through
the
upper
portion
of
the
cylinder
head
and
the
engine
water
outlet
hose
back
to
the'
upperta,r)K
9£
the-:'radiator.
Then
the
water
passing
through
the,thin:~iwal1~
..
p~ling
tubes
of
the
. " -
~
..
radiator
element
is
cooled
by
thec=()oli~fa.q.'Jl'nd~finally
returns
to
the
lower
tank
of
the
radiator
tocomplete(;lH~i~;g;circulation'"
...
'".
-:
,
.•
\;..
',1lt.:-,
'.
~
In
order
to
control
the
water
temperab.1re
;,~;thermostat
is
pro-
vided
on
the
cylinder
head
front
cover.
When
cylinder
head
outlet
water
temperature
reaches
70+
2°e,
the
thermostat,
starts
to
open,
and
when
the
temperature
reaches
85°C,
the
th~rlnostat
opens
ful-
ly.
When
the
water
temperature
is
below
the
lower
limit,
the
thermostat
remains
closed
and
the
cooling
water
can't
flq;W
to
the
upper
tan.k
of
the
radiator,
but
flows
back
to
the
w~~e,r
pump
through
the
small
bypass
pipe
beneath
the
thermostat.-·Thu,g,
the
cooling
water
directly
pumped
back
to
the
cylinder
'block"ifni!
head
69
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