Cooling System - Westerbeke 4.5KW BCGB-60HZ Operator's Manual

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
~~~~system
where finally it is discharged overboard.
~_-,.;;:;:;;!f"-COOLANT
RECOVERY TANK
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
free from harmful deposits.
RAW WATER/COOLANT DIAGRAM
COOLANT
c=V
RAWWATER
-+
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TO SIPHEN BREAK \ "
[IF REQUIRED]
-,..!.. ,
\.:,
\.1,\
,
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RAW WATER IN
£,j .....
'1:
HEAT EXCIHANGER_il
/
ZINC
RAW WATER D1SI7HARGE"
"tl'Y'
WESTERBEKE
Engines & Generators
14
WESTERBEKE recommends this raw wa.
discharge hose be looped above and down to the
exhaust elbow as illustrated.
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