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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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