Installation manual
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
tymperature
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
corrosiol1.
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
miXture
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 -
4O"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 anomust be installed
oefore
operating the
engine.
NOTE:
171is
tank,
with
its
sltort
run
oJ
plastIC
hose,
is
best
located
at
or
above
the
level
of
the
engine:r
manifold.
NOTE:
Periodically check
the
conditiQn
of
the
pressure
cap.
Ensure
that
rhe
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:
PrDper
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
opel1ing
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
0
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
run
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.se
the
petcock
and
install
the
pressure
cap.
Remove
the
cap
on
the
coolant recovery tank
and
fill
with
coolant mix
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
coolant
to
the
recovery
tank if
needed.
Clean
up
any
spilled coolant.
Engines & Generators
16