Yanmar 3YM20, Operation Manual

Page: 44 / 56

44
4. MAINTENANCE AND INSPECTION
EN
(3) Replace the Lubricating Oil Filter
(See 4.3.1 (1))
(4) Adjusting the Tension of the Alter-
nator Driving Belt (See 4.3.1 (7)).
(5) Clean the Intake Silencer
Disassemble the intake silencer and
clean the inside thoroughly. Remove
the silencer by taking off the clamp.
Clean the element with a neutral de-
tergent. Reassemble after it is com-
pletely dry.
(6) Inspect Inner Parts of the Seawater
Pump
Depending on the use, the inside parts
of the seawater pump deteriorate and
discharge performance drops. At the
specified interval or when the volume
of seawater discharged is reduced, in-
spect the seawater pump in accor-
dance with the following procedures:
1. Loosen the side cover bolts and re-
move the side cover.
2. Illuminate the inside of the seawater
pump with a flashlight and inspect.
3. If any of the following problems are
found, disassembly and maintenance
are necessary:
1. Impeller blades are cracked or nicked.
Edges or surfaces of the blades are
marred or scratched.
Note: The impeller must be replaced period-
ically (every 1000 hrs.)
2. Wear plate is damaged.
3. If no damage is found when inspecting
the inside of the pump, re-assemble
the side cover.
Fit the O-ring to the groove of the joint
face before replacing the side cover.
If a large amount of water leaks contin-
uously from the water drain pipe be-
neath the seawater pump during
operation, disassembly and mainte-
nance (replacement of the lip seal) are
necessary.
When disassembly and maintenance
of the seawater pump are necessary,
consult your Yanmar dealer or distrib-
utor.
The seawater pump turns in the di-
rection as shown in the below fig-
ure, and the impeller must be
installed while considering the im-
peller direction.
If the impeller has been removed
for any reason and must be re-as-
sembled, be very careful not to
make a mistake and turn it in the
wrong direction. Additionally, if the
engine is being turned manually, be
A Fuel filter
A Element
A
A
NOTICE