5 COOLING SYSTEM
Thermostat
Thermogauge
IIL::_¢==::~
~B~yp~a~s~s~h~o~s~e
__
~~~r---rT~
- Engine water
Radiator
jacket
.;::!
\ n
--<:-__ I!
---::-,
Dral'n cock i
il
;1
1----.::c----.".,.,~.-:~~_
..
:
..
- .
..,-;------~!,1
U
-
-_-.II
'1"'"
Oil
cool:7-~Drain
cock
(in
j
'-..._
..
_
..
.,....-_
..
\
~
I:
i I
j !;U
I
'1
° ) ii
0'-.0
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u
Fig.
3-35 Cooling system diagram
As
illustrated
in
the
diagram (Fig. 3-35). cooling water
is
kept
in
forced circulation
by
centrifugal water pump. The system has a thermostat, whose
valve
remains close
at
low
water temperature, letting cooling water circulate between water pump and engine body
via
bypass hose, and opens,
as
water gets
hot
from absorbing heat from crankcase, cylinder
head, etc.,
to
let it run into radiator
to
be cooled there by air blasts from fan, and
at
the
same time, close bypass hose.
Thermostat case on cylinder head has two bosses: one covering hole
to
fit
in
thermostat
and the other,
water outlet for car heater.
5-1
Cooling water and radiator
1)
For checkup
of
water level, refer
to
"Checkup and preparations prior
to
starting".
2)
In
order
to
remove scale and dust
in
radiator and engine water jacket
to
improve cooling efficiency, open drain cocks
to
drain,
fill
radiator with fresh
oil
through its inlet, and run the engine for some 20 minutes for flushing,
at
intervals of 500Hr or
12,OOOkm
of run, or twice a year (in spring and fall).
If
they have gathered much scale and dust, run the engine for about
30
minutes
with caustic soda solution or cleansing liquid
in
the system and drain it off
-
48-
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