COOLING
SYSTEM
FRESH
WATER
COOLING
CIRCUIT
Fresh water (antifreeze)
is
moved
through
the engine
by
a
belt
driven
circulating
pump,
absorbing heat
from
the
engine.
Some
of
the
coolant by-passes
the
thermostat
to
maintain
circulation
in
the
engine
and
is
drawn
through
the
heat
exchanger.
The engine operating temperature
rises
and
the
thermostat reacts
to
this
and
starts
to
open
allowing
more
coolant
to
flow
through
the
heat
exchanger.
The thermostat
opening
will
change
as
it
gains
control of
the
engine
operating temperature
by
allowing
more
or
less coolant
flow
through
it.
ENGINE
COOLANT
WESTERBEKE recommends a
mixture
of
50%
antifreeze
and
50%
distilled
water.
Distilled water
is
free
from
the
chemicals that can corrode internal engine surfaces.
The antifreeze performs a double
duty.
It
allows
the
engine
to
run
at
proper temperatures
by
transferring heat
away
from
the
engine
to
the
coolant
and
lubricates and protects
the
cook
ing
circuit
from
rust
and
corrosion,.
Look for a good quality
antifreeze that contains Supplemental Cooling Additives
(SCAs)
that
keep
the
antifreeze chemically balanced, crucial
to
long term protection.
NOTE:
Look
for
the
new
environmentally
friendly
long
lasting
antifreeze
that
is
now
available.
The recommended
50/50
mixture
will
protect the engine
against
the
most extreme temperature. The antifreeze
miX:ture
will
also
retard rust within
the
engine
and add
to
the
life of
the
circulating pump impeller
and
seals.
A proper
50/50 mixture
as
recommended will protect
the
engine coolant
to
temperatures
of-
40"F.
The coolant recovery tank
allows
for
the
expansion
and
con-
traction of
the
engines coolant
during
engine operation
with-
out introducing air
into
the
system.
This recovery
tank
is
provided
and
must be installed
oefore
operating the
engine.
NOTE:
This
tank,
with
its
sltort
run
oJ
plastcc
hose,
is
best
located
at
or
above
the
level
of
the
engine's
manifold.
NOTE:
Periodically check
the
condition
of
the
pressure
cap.
Ensure
that
the
upper and lower
rubber
seals
are
in
good
condition
and check that
the
vacuum
valve
opens
and
closes
tightly.
Carry
a
spare
cap.
CHANGING
COOLANT
The engine's coolant must be changed
according
to
the
MAINTENANCE
SCHEDULE.
If
the
coolant
is
allowed
to
become contaminated, it can lead
to
overheating
problems.
A
CAUTION:
Proper
cooling
system
maintenance
is
critical;
a
substantial
number
of
engine
failures
can
be
traced
back
to
cooling
system
corrosion.
Drain the engine coolant
by
loosening
the
drain
plug
on
the
heat exchanger
and
opehing pressure
cap.
Also
loosen
the
air
bleed petcock
on
the
top of
the
heat exchanger
A
CAUTION:
The
engine
must
be
allowed
to
cool
down
before
attempting
these
procedures.
Not
only
is
the
surface
of
the
engine
hot
but
coolant
temperatures
can
be
at
190°
F.
Refilling
the
Coolant
After
closing the engine block
drain,
pour
clean,
premixed
coolant
into
the
manifold
and
when
the
coolant
is
visible
in
the
manifold,
start the engine
and
nm
it at
slow
idle.
Open
the
air
bleed
petcocks
on
the
manifold
and
the
thermostat
housing.
Monitor
the coolant
in
the manifold
and
add
as
needed.
Fill
the
manifold
to
the
filler
neck
and
when
the
coolant
flowing
from
the
petcock
is
free of air
bubbles,
clo~e
the
petcock
and
install
the
pressure
cap.
Remove
the
cap
on
th~
coolant
recovery
tank
and
fill
with
coolannnix
to
halfway
between
LOW
and
MAX
and
replace
the
cap.
Run
the
engine
and
observe
the
coolant
expansion
flow
into
the
recovery
tank.
When
the
petcock
on
the
thermo-
stat
housing
is
free
of air
bubbles,
close that
petcock.
After
checking
for
leaks, stop
the'
generator
and
allow
it
to
cool.
Coolant
should
draw back
into
the
cooling
system
as
the
engine
cools
down.
Add
coolimt
to
the
recovery
tank
if
needed.
Clean
up
any
spilled coolant.
Engines & Generators
16
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