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COOLING SYSTEM
Description
Westerbeke marine diesel engines are designed and equipped for fresh water cooling. Heat produced in
the engine by combustion and friction is transferred to fresh water which circulates throughout the engine.
This circulating fresh water cools the engine block and
Its
internal moving parts. The heat
Is
transferred ex-
ternally from the fresh water to sea water by means of a heat exchanger, similar in function to an automo-
tive radiator. Sea water flows through the tubes of the heat exchanger while fresh water flows around the
tubes; engine heat transferred to the fresh water is conducted through the tube walls to
the
sea 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, the fresh water
Is
cooled by
sea
water, and the
sea
water carries the transferred
heat over the side through the exhaust system. The fresh water and sea water circuits are Independent of
each other. Using only fresh water within the engine allows the cooling water passages to stay clean and
free from harmful deposits. The two Independent circuits and their components are discussed
In
the follow-
ing paragraphs.
Fresh Water Circuit
NOTE:
Refer to _paragraphs
A
and
B
in this section for the recommended antifreeze and water
mixture to be used as the fresh water coolant, and for Information on filling the
fresh
water
system.
·
Illustrated below
Is
a typical Westerbeke engine's cooling system. Both fresh water
and
sea water flow
through their independent cooling circuits.
To
Ff9Sll
Water
Circulating
Pump Inlet
on
Engine Block
b
':j '•
Westerbeke Diesel Engines
To TransmiSSion Oil Cooler
42
I
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