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
anode
is
to
sacrifice
itself
to
electrolysis action taking
place
in
the
raw
water cooling circuit, thereby reducing
the
effects
of electrolysis
on
other components of
the
system.
The
condition
of
the
zinc
should be checked monthly
to
determine
its
service
life.
Once
that
is
established,
the
zinc
replacement
period
can
be
noted
in
your
maintenru;1ce
log.
Spare
zinc
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-
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 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 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
·
to
your engine model's heat exchanger
end
gasket part
num-
ber),
0-ring
and
cover,
and install a
new
zinc
anode.
NOTE:
Tht;
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 performed
more
often
than
e'Very
JOOrthours.
AIR
INTAKE
I
SILENCER
DESCRIPTION
A
marine
diesel
engine
running
at 1800 rpm will typically
consume
as
much
as
6,000
cubic
feet
of
air per
hour.
Not
only
must
the
engine
room
be
well
ventilated, the air
flow
into
the
engine
must
be
unrestricted.
·
AIR
INTAKE
FILTER/SILENCER
The
replaceable
canister contains a paper element that
should
be
inspected
every
100
operating
hours.
Dirt in
the
element'
can
be
shaken
off
or cleaned
with
compressed air,
however,
if
the
element
is
greasy
or
black
with
dirt,
the
canister
must
be
replaced,
cany a
spare.
·
NOTE:
To
operate
efficiently a
diesel
engine
must
intake
a
continuous
volwne
of
clear
air.
Hard
starting,
an
erratic
idle,
and
black
exlw.ust
snwke
are
all symptoms
of
a restricted air
intake.
FILTER
CARTRIDGE
INSTALLATION
Detach
the
air inlet hose
from
the air intake. Unplug the air
temperature
sensor
from
the
engine harness. Then remove
the
·
bolts
that
secure
the
air
inuike
silencer housing
to
the
inlet base
and
remove
the
housing,
screen facing
out.
Reinstall
the
housing
to
the
inlet
base.
Plug
in
the
air temperature sensor
to
the
harness
and
reconnect
the
air inlet
hose.
NOTE:
Regular inlet filter cartridge
nw.intenance
is
essential
for proper engine operation.
Failure
to
nw.intain
the
inlet
filter cartridge will result
in
air obstruction
into
the
engine,
causing poor fuel combustion and
resulting
in
snwkey!sooty
exhaust discharge-along with
lube
oil consumption and
possible filter deterioration which could
result
in
internal
engine
damage.
Filter Cartridge
PN# 039705
TURN
OVER
WHEN
INSTALLING
AIR
INTAKE
HOUSING
Engines· & Generators
17