Sea Water Circuit
The
sea
water flow is created
by
a
gear-clriven,
positive
displacement,
neoprene Impeller pump.
The
pump
draws
sea
waterdirectlyfromthe
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, absorbing
heat
from
the
fresh
water
c1rcUating
around
the
tubes.
The
sea
water
is
then
discharged from
the
cooling
system
over-
board
through
the
water-injected wet exhaust sys-
tem.
A zinc
anode,
or pencI, is located
in
the
sea
water
cooling
c1rcuitwithin
the
heat
exchanger.
The
pur-
pose
01
the
zinc
anode
is
to
sacrifice itself to
electrolysis action taking place in
the
sea
water
HEW
AHODE
REPLACE
REPLACE
Zinc
Anode
Conditions
CLEAH
OR
REPLAC
cooling
circuit, thereby reducing
the
effects of electrolysis
on
other components
of
the
system.
The
condi-
tion
of
the
zinc
anode
should
be
checked monthly
and
the anode
cleaned
or
replaced
as
required.
Spare
anodes should
be
carried
on board. Zinc anode debris
should
be
cleaned
from
the
area
inside of
the
heat
exchanger where
the
zinc
is
located.
If
this zinc debris
is
allowed to
"accumulate,
it
will
block the tube
open-
ings
through which
the
cooling
sea
water should flow.
Sea
Water Pump
The
sea water pump
is
a self-priming,
gear-clriven
rotary
pump
with a non-ferrous
housing
and a
neoprene
impeller.
The
impeller
has
flexible
vanes
which
wipe
against
a curved cain
plate
within
the
impeller housing.
producing
the
pumping action.
On
no account shoUd this pump
be
run
dry.
There
should
always
be
a
spare
impeller
and
impeller cover gasket aboard
(an
impeller
kit).
Sea
water pump
impeller
faUures
occur when
lubricant
(sea
water)
is
not
present during
engine
operation.
Such
falures
are
not
warrantable,
and
the
operators are caulioned to
rnake
sure
sea
water flow
is
present
at start-up.
Alternator and Water Pump Drive Belt Tension
IWARNINGI
Never
attempt
to
adjust the drive belt's ten-
sion
whUe
the
engine
is in operation.
CAUTION
Excessive
alternator
and
water pump drive
belt
tension
can
cause
rapid wear of the belt
and reduce
the
service
life of the fresh water
pump
and
alternator shaft bearings.
Exces-
sive
slack or the
presence
of
oU
on
the belt
can
cause
belt slipping, resulting in high
operating
temperature,
as
well
as
insufficient
alternator output.
Engines & Generators
34
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