Installation manual
COOLING
SYSTEM
Zinc
Anode
A
zinc
anode,
or pencil, is located
in
the
raw water
cooling
.circuit
within
the
heat exchanger.
The
purpose
of
having
the
zinc
~ode
is
to sacrifice them
to
electrolysis
action
taking
place
ill
the
raw
water cooling
circuit,
thereby
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 carried on board.
NEW
REPLACE
REPLACE
CLEAN
AND
REUSE
ZINC
ANODES
~OTE:
E~ectrolysis
action is the result
of
each particular
uzstallation
and
vessel location; not that
of
the
engine.
ZINC
ANODE
DO
NOT
USE
SEALANT
ON
THE
THREADS
TYPICAL
HEAT
EXCHANGER
ASSEMBLY
If
the
zinc
anodes
need
replacement,
hold
the
hex
boss
into
which
the
zinc
anode
is
threaded
with
a
wrench
while
loos-
ening
the
anode
with
another
wrench.
This
prevents
the
hex
boss
from
possibly
tearing
off
the
exchanger
shell.
After
removing
the
Zinc,
note
the
condition
Qf
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
debris.
Always
have
a
spare
heat
exchanger
end
gasket
in
case
the
present
one
becomes
dam-
aged
when
removing
the
end
cover.
Replace
the
gasket
(refer
tc 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
are
pipe
threads
and
do
,not
require
sealant.
Sealant
should not
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
hours
of
operation,
remove,
clean
and
pressure
test
the engine's heat
exchanger.
(A
local
auto-
motive
radiator
shop
should
be .able
to
clean
and
test
the
heat
exchanger.)
NOTE:
Operating
in
silty
and/or
tropical
waters
may
require
that a
heat
exchanger
cleaning
be
perfonned
more
often
than
every 1000
hours.
IR
BLEED
PETCOCK
COVER
SECURING
BOLT
WATER
CLEAN
our
EVERY
DRAIN
INSPECT
BOTH
ENDS
100
HOURS
CL'fAN
OUT
DEBRis
HEAT
EXCHANGER
NOTE:
When installing
the
heat exchanger end
covers.
Be
sure
that the end cover securing bolt's sealing
O-ring
is
installed.
Failure
to install this sealing
O-ring
can
result
in
end plate failure/sea water
leakage.
Engines
&
Generators
18