Westerbeke 12C- TWO Operator's Manual page 21

ENGINE COOLING CIRCUIT
OEseRIPTION
Weslerbeke marine diesel generators are designed and
¢quipped for fresh water cooling. Heal produced in the
¢ngine by combustion and friction is transferred to fresh
water coolant which circulates throughout the engine. This
. ¢irculating fresh water coolant cools the engine block and its
internal meving parts. The heat is transferred externally from
the fresh water coolant to raw water by means of a heat
¢xchanger; similar in function to an automotive radiator. Raw
water flows through the tubes of the heat exchanger while
wesh water coolant flows around the tubes; engine heat trans-
~erred
to the fresh water coolant is conducted through Ihe
tube walls to the raw water which is then
pump~d
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 independent of
each other. Using only fresh water coolant wilhin the engine
allows the cooling water passages
10
slay Clean and free from
harmful 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.
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EXHAUST
TYPICAL ASSEMBLY
COOLING CIRCUIT DIAGRAM
FRESH WATERy
RAW WATER
*
'-
... WESTERBEICE
Engines & Generators
15
NOTE: AN ANTI·SIPHON
VALVE MAY BE REQUIRED
HEAT
EXCHANGER
FRESH WATER
DRAIN
DRAIN