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10
Cooling water
As cooling water, use soft water with least impurity content such
as
tap water
(potable water)
or
rainwater,
and
never
use
hard
water or foul
water~
Use of hard water or water containing much
impurity will lead to collection
of
scale in the engine and heat
exchanger with resultant decline in cooling effects.
2..
Antifreeze
In cold districts, care should be taken to prevent cooling water
from freezing"
Cooling water, 'itlhen frozen, expands to break the
heat exchanger and the cylinder block
f
and it is essential that
antifreeze be added to cooling water in a quantity proportional to
the lUvlest temperature of the dist.rict..
It is recommended that
the antifreeze mixture
be used
throughout the yearo
*Antifreeze
of
poor
quality
or
without
rust
inhibitor
will
cause
corrosion
of
the
cooling
system.
Always
use
antifreeze
prepared
by
a
reliable
maker,
and
never
use
it mixed with antifreeze
of a
different brand.
*Make sure that the cooling system of the engi.ne is cleaned
well before adding
antifreeze~
*Recommended
antifreeze
for.
year
round
use
is
ZEREX
or
PRE;STONE
vIi
th
rust
inhibi tor"
ANTIFREEZE ADDITION DATA
Antifreeze
Concentration
%
13
23
30
35
45
50
60
--~--"""":"~-~""'-~."""~"""""-"-""~-~'''''''.'''~---''~'.'~-'
Freezing
. . c
-5
-10
-15
-20
-30
-40
-50
t
e.~.E.~E_a
t
~
r.
E:
C'
F)
(23)
(14)
( 5.)
(-4)
(-22)
(-40)
(-58)
Note:
It
is
advisa.ble
that
antifreeze
concen"tration
be
selected on the basis of a
temperature which is about
5«C
(106F)
lower
than
the
actual
atmospheric
tem-
pera.ture expected ..
3.
Fresh water cooling system
The system consists of a sea water pump which pumps raw sea water
through a heat exchanger to remove heat from the coolant.
The raw
water is discharged overboard through the exhaust line$
The engine coolant
(fresh water with or without antifreeze)
is
circulated
by
the fresh water pump in continuous circuit., pumped
through the cylinder block, cylinder head, heat exchanger and back
to the fresh water pump.
16
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