Installation manual
ENGINE
COOLING
CIRCUIT
dESCRIPTION
Westerbeke marine diesel generators are designed and
equipped for fresh water cooling. Heat produced in the
engine by combustion and friction is transferred to fresh
water coolant which circulates throughout the engine. This
circulating fresh water coolant cools the engine block and its
iIj.ternal moving parts. 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
hesh
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
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COOLING
CIRCUIT
DIAGRAM
FRESH
WATER
ยข
RAWWATER
_
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 independent
of
each other. Using only fresh water coolant within the engine
allows the cooling water passages to stay clean and free from
ham1ful deposits.
NOTE:
Refer to ENGINE COOLANT paragraphs in this sec-
tion for the recommended antifreeze and water mixture to be
used as the fresh water coolant
and
for information
on
filling
the fresh water system.
------..
NOTE:
KEEP
PASSAGE
THROUGH
THE
MANIFOLD
CLEAR
(A
PIPE
CLEANER
WORKS
WELL).
,
~
NOTE:
AN
ANTI-SIPHON
-
",
VALVE
MAY
BE
REQUIRED
\
FRESH
WATER
DRAIN
Engines & Generators
14