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Westerbeke WPDS-20 Instrukcja Operatora Strona 32

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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
~s
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
~
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
circu~s
are independent of
each other. Using only fresh water
w~hin
the engine allows the cooling water passages
to
stay clean and
free from harmful
depos~s.
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
circu~s.
To
Fresh
Water Circulating
Pump
Inlet
on
Engine Block
b~""
Incoming Sea Water
/
Sea
Water Impeller Pump
Westerbeke Diesel
Engines
To
Transmission
Oil
Cooler
42
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