Westerbeke BCG4.0KW Operator's Manual page 54

Sea Waler Circuil
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 passes the water to the heat
exchanger's sea water inlet. The sea water pas-
ses through the heat exchanger's tubes, from
which heat from the fresh water system is ab-
sorbed and then is discharged from the cooling
system overboard through the water-injected wet
exhaust system.
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 circun, thereby reducing the effects of
electrolysis on other components of the system.
The condition of the zinc anode should be check-
ed monthly and the anode cleaned or replaced,
as required. Spare anodes should be carried on
board.
Sea Water Pump
~
.
...
.. t
.
::
NEW
ANODE
••..
REPLACE REPLACE
Zinc Anode Condnions
CLEAN
OR
REPLACE
The sea water pump is a self-priming, belt.<Jriven 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 on board (an impeller kn).
NOTE: Impeller failures resulting from a loss of sea water coolant are not warrantable failures.
51 Westerbeke Generators