Westerbeke 65B-FOUR Manual de instalación Pagina 19

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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
com-
bustion 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
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
harmful deposits.
RAW
WATER
INTAKE
STRAINER
A major part
of
the raw water cooling system is a proper
boatyard/builder installed intake strainer.
NOTE:
Always install
the
strainer
at
or below
the
waterline
so
the
strainer will always
be
self-priming.
A clean raw water intake strainer is a vital component
of
the
engine's cooling system. Include a visual inspection
of
this
strainer when making your periodic engine check. The water
in the glass should be clear.
Perform the following maintenance after every
100 hours
of
operation:
1.
Close the raw water seacock.
2. Remove and clean the strainer filter.
3. Clean the glass.
4. Replace the washer
if
necessary.
5. Reassemble and install the strainer.
6.
Open the seacock.
7. Run the engine and check for leaks.
NOTE:
Also follow
the
above
procedure after having
run
hard
aground.
If
the engine temperature gauge ever shows a higher than
normal reading, the cause may be that silt, leaves or grass
may have been caught up in the strainer, slowing the flow
of
raw water through the cooling system.
..
~
WASHER~
STRAINER
~~-
FILTER
13
TYPICAL
RAW
WATER
INTAKE
STRAINER
(Owner
Installed)
INCOMING
RAW
WATER
SEACOCK
~
INSPECT
AND
CLEAN
EVERY
tOO
HOURS
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