
Sea Water
Circuit
The sea water flow is created
by
a belt-
driven, positive displacement, neoprene
impeller pump. The pump draws sea
water directly from the ocean through the
sea
cock
and sea water strainer and pas-
ses the water
to
the heat exchanger's sea
water inlet. The sea water passes through
the heat exchanger's tubes, from which
heat from the fresh water system is ab-
sorbed, and then the sea water
is
dis-
charged
from
the
cooling
system
overboard through the water-injected wet
exhaust system. Be sure
to
clean zinc
debris from the area inside
of
the heat ex-
changer where the zinc anode is posi-
tioned.
NEW
ANODE
REPLACE REPLACE
Zinc Anode Conditions
CLEAN
OR
REPLACE
A zinc anode,
or
pencil, is located in the sea water cooling circuit within the heat exchanger. The purpose
of
the zinc anode is
to
sacrifice itself
to
electrolysis action taking place
in
the sea water cooling circuit, there-
by
reducing the effects of electrolysis on other components
of
the system. The condition
of
the zinc anode
should be checked monthly and the anode cleaned or replaced as required. Spare anodes should be car-
ried on board.
Sea Water
Pump
The sea water pump
is
a self-priming,
gear-<:lriven
rotary pump with a non-ferrous housing and a neoprene
impeller. The impeller has flexible vanes which wipe against a curved cam plate within the impeller housing,
producing the pumping action. On no account should this pump be run dry. There should always be a spare
impeller and impeller cover gasket aboard (an impeller kit). Sea water failures occur when lubricant
(sea
water) is not present. Such failures are not warrantable and the operator's are cautioned
to
make sure
sea
water flow is present at start-up.
Water
Pump
Drive Belt Tension
Never attempt
to
adjust the drive belt's tension while the engine is in operation.
CAUTION
Excessive water pump drive belt tension can cause rapid wear
of
the belt and reduce the ser-
vice
life
of
the fresh water pump's bearings. Excessive slack
or
the presence of oil on the belt
can cause belt
slipping, resulting in high operating temperatures.
The water pump drive belt
is
properly adjusted
if
the belt can be deflected no less than 3/8 inch and no more
than 1/2 inch
(10
mm,
12
mm) as the belt
is
depressed with the thumb at the midpoint between the two pul-
leys on the longest span of the belt. A spare drive belt should be carried on board.
49
Westerbeke Generators
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