Operator`s manual
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 passes the water
to
the heat exchanger's
sea
water inlet. The sea water passes through the heat exchanger's tubes, from
around which the fresh water coolant mixture circulates. Heat from the fresh water system
is
absorbed and
then
is
discharged from the cooling system overboard through the water-injected wet exhaust system.
Sea Water
Pump
The sea water pump
is
a self-priming, belt-driven 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 kit).
NOTE: Impeller failures resulting from a loss
of
sea water coolant are
not
warrantable failures.
Self priming occurs when the engine mounted pump
is
close
to
or
below the water line of the
vessel.
Zinc
Anodes
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.
NOTE: Electrolysis action
is
the result of each particular installation and vessel location; not
that
of
the generator.
If the zinc pencil needs replacement,
hold
the
hex
boss
into
which
the
zinc
pencil
is
threaded
with
a
wrench
while
loosening
the
anode
with
another
wrench, This prevents
the hex boss from possibly tearing off
the exchanger shell. After removing
the zinc, note the condition of
it.
If the
zinc
is
in
poor condition, there are
probably a lot
of
zinc flakes within the
exchanger. Remove the end of the
heat
exchanger
and
clean
the
inside
of
all
zinc debri.
Always
have
a
spare heat exchanger end
gasket
in
case
the
present
one
becomes
damaged
when
removing
the
end
cover. Replace the gasket (refer
to
your engine model's heat exchanger
end gasket part number), cover, and
install a new zinc pencil.
NEW
ANODE
45
REPLACE
REPLACE
CLEAN
OR
REPLACE
Westerbeke Generators