Installation manual
.
COOLING
SYSTEM
Zinc
Anode
#011885
A
zinc
anode,
or
pencil,
is
located
in
the
raw
water
cooling
circuit
within
the
heat
exchanger.
The
purpose
of
having
the
.
zinc
anode
is
to
sacrifice
them
to
electrolysis
action
takjng
place in
the
raw
water
cooling
circuit,
thereby
reducing
the
effects
of
electrolysis
on
other
components
of
the
system.
The
condition
of
the
zinc
anode
shonld
be
checked
monthly
and
the
anode
cleaned
or
replaced
as
required:
Spare
anodes
should
be
carried
on
board.
NEW
REPLACE
REPLACE
ZINC
ANODES
CLEAN
AND
REUSE
NOTE:
Electrolysis
action is
the
result
of
each
particular
installation
and.
vessel
location;
not that
of
the
engine.
.
If
the
zinc
anodes
need
replacement,
hold
the
hex
boss
into
which
the
zinc
anode
is
threaded
with
a
wrench
while
loos~
erung
the
anode
with
another
wrench.
1his
prevents·
the
hex
boss.
frompossibly
tearing
off
the
exchanger
shell.
After '
removing
the
iinc,
note
the
condition
of
it.
If
the
zinc
is
in
poor
condition,
thOte
are
probably
a
lot
of
zinc
flakes
within
the
exchanger.
Remove
the
end
of
the
heat
exchanger
and
clean
the
inside
of
all
zinc
debris.
Always
have
a
spare
heat
exchanger
end
gasket
in
case
the
present
one
becomes
dam-
aged
when.
~emoving
~e
end
cover.
Replace
the
gasket
(refer
to
your
engIne
model
s heat
exchanger
end
gasket
part
num-
ber),
O-ring
and
cover,
and
install
a
new
zinc
anode.
NOTE:
The
threads
of
the
zinc
anodes
lire
pipe
threads
and
do
.not
require
sealant.
Sealant
shoultlnot
be
used
as
it
may
insulate
the
zinc
from
the
metal
of
the
heat exchanger
hous-
ing
preventing
electrolysis
action
on
the,
zinc.
Heat
Exchanger
Service
After
approximately
1000
hOl/rs
of
opera~on,
remove,
clean
and
pressure
test
the
engine's
~eat
exchanger.
(A
local
auto-
motive
radiator
shop
should
be
able
to
clean
and
test
the
heat
exchanger.).
.,
.
NOTE:
Operating
in
siliy
and/or
tropical
waters
may
require
that a
heat
exchanger
cleaning
be
performed'
more
often
than
every
1000
hours.
HEAT
EXCHANGER
COVER
SECURING
BOLT
INSPECT
BOTH
ENDS
OUT
EVERY
'DRAIN
100
HOURS
CLEAN
OUT
DEBRis
TYPICAL
ASSEMBLY
~
IRBlEED
~
PETCOCK
.~=.
ANTIFREEZE
CO'OlANT
DRAIN'
(PftCOCK
OR
HEX
PLUI1;'
NOTE:
When
installing
the
heat
exchanger
end.
covers.
Be
sure
that
the
end.
cover
seeUling,bolt.'s
sealing
O-ring
is
installed.
Failure
to
install
miiiealingO.ring
can
result
in
elld
plate
failure/sea
water
leakage.
Engilles & Gellerators
19