Installation manual
COOLING
SYSTEM
FRESH
WATER
COOLlN.G
I;I{lCUIT
Ftesh
w:at~r
coolant
is
pumped
through
the
engine
by
a
'circulating pump,
absorbing
heat
from
the
engine.
The
coolant
then
passes
through
the
.thermostat
into
the
manifold,
to
the
heat
exchanger
where
it
is
cooled
and
returned
to
the
engine
block via
the
suction
side of
the
circulating
pump.
When
the
engine is
started
cold,
external
coolant
flow
is
prevented
by
the
closed
thermostat
(although
some
coolant
flow
is
bypassed
around
the
thermostat
to
prevent
the
exhaust
manifold
from
overheating).
As
the
engine
warms
up,
the
thermostat
gradually
opens,
allowing
full
flow
of
the
engine's
coolant
to
flow
unrestricted
to
the
external
portion
of
the
cooling
system
.•
ENGINE
COOLANT
WESTERBEKE
recommends
a
mixture
of
50%
antifreeze
and
50%
distilled
water.
bistilled 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
cooting
circuit
from
rust
and
corrosion.
Look
for
a
good
quality
antifreeze that
contains
Supplemental
Cooling
Additives
(SCAs)
that
keep
the
antifreeze
chemically
bal-
anced,
crucial
to
long
term
protection.
NOTE:
Lookfor
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
recommeI!ded
will
protect
the
engine
coolant
to
temperatures
of - 40'F.
Coolant
Recovery
Tank
The
coolant
recovery
tarik
allows
for
the
expansion
aJ!d
con-
traction
of
the
engines
coolant
during
engine
operation
with-
outintroducing air
into
the
system.
This
recovery
tarik
is
provided
with
fresh
water
cooled
models
and
with
the
fresh
water
coolant
conversion
kit
and
must
be
installed before
operating
the
engine.
.
NOTE:
This
tank,
with
its
short
run
of
plastic
hose,
is
best
located
at
or
above
the
level
of
the
engine's
manifold.
·NOTE:
Periodically
check
the
condition
of
the
pressure
cap.
Ensure
thot
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.
Drain
the
engine
coolant
by
removing
the
block
drain
adja-
cent
to
the
oil
filter,
remove
the
in-board
drain
plug
on
the
heat
exchanger
and
·remove
the
pressure
cap
from
the
water
jacketed
exhaust
manifold.
BLOCK
. .
COOL
DRAIN
~
. & .
4/)J~
,
\
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1:;:::-
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'l~
@'ii
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1 .
~
Refillil1gthe.;~oolant
After
closing
the
engine
drains,
pour
clean,
preri:rixed
coolant
into
the
manifold,
start
the
engine
and
run
it
at
a
slow
idle.
Monitor
the
coolant
in
the
manifold
and
add
as
needed.
Fill
the
manifold
to
the
filler
neck
and
when
the
coolant
is
flowing,
install
the
pressure
cap.
Remove
the
cap
on
the coolant recovery
tarik
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
tarik.
After
checking
for
leaks,
stop
the engine
and
allow
it
to
cool.
Coolant
should
draw
back
into
the cooling
system
as
the
engine
cools
down.
Add
coolant
to
the
recovery
tarik
if
needed.
Clean
up
any
spilled
coolant
A
CAUTION:
The
engine
"",ust
be
allowed
to
cool
down
before
attempting
these
procedures.
Not
only
is
the
sud
ace
of
the
engine
hot
but
coolant
temperatures
can
be
at
190'F.
A
CAUTION:
Proper
cooling
system
maintenance
is
critical;
a
substantial
number
of
engine
failures
can
be
tracedbackto
cooling
lIystem
corrosion.
ElJ.gJn_t!~
& Generators
16