4. Maintenance & Inspection
(4)
Inspecting and Replacing
Anticorrosion Zinc
The timing
for
replacing anticorrosion zinc
varies depending
on
the
characteristics
of
the
seawater and operational conditions.
Inspect
the
zinc periodically and remove
any corroded areas.
Replace
the
anticorrosion zinc when
it
has
been reduced
to
less than
1/2
of
its
original size.
If
replacement
of
zinc is
neglected and operation is continued wi
th
a small volume
of
anticorrosion zinc,
corrosion
of
the seawater cooling system
will
occur
and water leakage
or
parts
breakage
will result. The anticorrosion
zinc
is on the inside
of
the
anticorrosion zinc
plug which is labeled with a
sticker
reading: Anticorrosion Zinc.
I
(5)
Replacing
the
Oil Filter
(See 4.3.1 (1
))
Engine Oil and Lube
(6)
Cleaning
the
Intake Silencer
Disassemble
the
intake silencer and clean
the inside thoroughly.
Remove the
cover
by
taking
off
the
clamp.
Clean the ele
ment
with a neutral
de
tergent.
Reassemble after
it
is completely dry.
4.3.5 Inspection Every 600 Hrs.
(1)
Replac
in
g Fresh
Water
Cooling
Cooling performance
drops
when cooling
water is contaminated with rust and scale.
Even
if
antifreeze
or
antirust is added,
the
cooling
water
must
be
replaced
periodically because
the
properties
of
the
agent
will degenerate.
To
extract the cooling
water
, open the
cooling water
cocks
(three places) as
shown in 3.4(2).
(Refer
to
3.2.4
for
resupplying cooling
water.)
40
(2)
Inspe
ct
ing Inner Parts
of
the
Sea-
wat
er
Pump
Depending on
the
use,
the
inside parts
of
the seawater
pump
deter
iorate and dis-
charge performance drops. At the
specified interval
or
when
the
volume
of
seawater discharged is reduced, inspect
the seawater
pump
in accordance with the
following procedures:
1 . Loosen the side
cover
set bolts and
remove
the
side cover.
2. Illuminate the inside
of
the seawater
pump
with a flashlight
and
inspect.
3.
If any
of
the
following problems is
found, disassembly and maintenance
are necessary:
a)
Impeller blades are cracked
or
nicked.
Edges
or
surfaces
of
the blades are marred
or
scratched.
Note:
T
he
impe
ller must
be
replaced
periodica
ll
y (every 1000 hrs.).
b) Wear plate is damaged.
4. If no damage is found when inspecting
the inside
of
the
pump
, reassemble the
si
de
cover.
Fit the
0-ring
to
the groove
of
the
joint
face before replacing
the
side
cover
.
If a large amount
of
water leaks
co
ntinuously from
the
water drain pipe
beneath the seawater
pump
during
operation, disassembly and
mainte-
nance (replacement
of
the oil seal) are
necessary.
When disassembly and maintehance
of
the
seawater
pump
are necessary, con-
sult your Yanmar dealer
or
distributor.
•
t11
r
..
.:;
The seawater pump turns in
the
counterclockwise direction, but
the
impeller must be insta
ll
ed by
turning in
the
clockwise direction.
If
the
impeller has been removed
for any reason and must
be
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