COOLING
SYSTEM
DESCRIPTION
Westerbeke marine engines are designed
and
equipped
for
fresh water cooling. Heat produced in the engine
by
combus-
tion
and
friction
is
transferred
to
fresh water coolant
which
circulates throughout the engine. This circulating fresh water
coolant cools the engine block,
its internal moving
parts,
and
the engine oil. The heat
is
transferred externally
from
the
fresh water coolant
to
raw water
by
means
of
a heat
exchanger, similar
in
function
to
an
automotive radiator.
Raw
water
flows
through
the
tubes
of
the heat exchanger
while
fresh water coolant
flows
around
the,
tubes; engine heat
trans-
ferred
to
the fresh water coolant
is
conducted through
the
tube walls to the raw water which is then pumped
into
the
exhaust system where finally it is discharged overboard.
In
other words,
the
engine is cooled by fresh water coolant,
this coolant
is
cooled
by
raw
water, and the raw water carries
the transferred heat overboard through the exhaust
system.
the
fresh water coolant
and
raw water circuits are
indepen-
dent of each
other.
Using only fresh water coolant within the
engine allows the cooling water passages to stay clean
and
Coolant
Recovery
Tank
A coolant recovery
tank
allows
for
engine
coolant
expansion
and
contraction
during
engine operation,
without
any signifi-
cant
loss
of coolant
and
without
introducing
air
into the
cool~
ing
system.
This
tank should
be
located at
or
above
the
engine manifold level
and
should be easily
accessible.
COOLANT
EXPANSION
!TO
COOLANT
RECOVERY
TANK
·
KEEP
THESE
PASSAGES
CLEAR
TO
ENSURE
A'FULL
FLOW
OF
COOLANT
TO
AND
FROM
THE
COOLANT
RECOVERY
TANK
(A
PIPE
CLEANER
WORKS
WELL)
free
from
harmful
deposits.
-
r---.....,
ENGINE
COOLING
DIAGRAM
(TYPICAL)
............
.
WATER
-----
PRESSURE CAP
INJECTED ELBOW
------
·FRESH
WATER¢
··
RAWWATER
.....
·MANIFOLD
•PRESSURE
CAP
INCOMING
RAW WATER
NOTE:
Periodically
check
the
condition
of
the
manifold
pres-
sure
cap.
Ensure
that
the
upper
and
lower
rubber
seals
are
in
good
condition
and
check
that
the
vacuum
V{llve
.operis
and
closes
tightly.
Carry
a
spare
cap.
14
RAW WATER DRAIN
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