GB
4. Maintenance & Inspection
41
(7) Inspecting Inner Parts of the Sea-
water Pump
Depending on the use, the inside parts of
the seawater pump deteriorate 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: The impeller must be replaced
periodically (every 1000 hrs.).
b) Wear plate is damaged.
4. If no damage is found when inspecting
the inside of the pump, reassemble 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
continuously from the water drain pipe
beneath the seawater pump during
operation, disassembly and maintenance
(replacement of the oil seal) are
necessary.
When disassembly and maintenance of
the seawater pump are necessary, con-
sult your Yanmar dealer or distributor.
The seawater pump turns in the
counterclockwise direction, but the
impeller must be installed by turning
in the clockwise direction. If the
impeller has been removed for any
reason and must be reassembled, be
very careful not to make a mistake
and turn it in the wrong direction.
Additionally, if the engine is being
turned manually, be careful to turn it
in the correct direction. Incorrect
turning will twist the impeller and
damage it.
(8) Washing the Turbocharger Blower
When engine revolution seems sluggish or
the exhaust colour poor, the blades of the
turbocharger blower may be dirty. Wash
the blower in the following manner:
1. Have ready blower wash (liquid
detergent), fresh water, and a small
pitcher.
2. Put the clutch in neutral and run the
engine at high speed (2500~3000rpm).
3. Slowly pour approximately 50cc of
blower wash into the turbocharger
suction inlet over a period of about
10 seconds.
Do not pour in a large amount of
blower wash at one time (pour it in
gradually) as this can damage the
blower blades and get water hammer
in the combustion chamber leading to
accidents.
4. After about 3 minutes, pour in
approximately 50cc of fresh water in the
same manner over a period of about
10 seconds.
NOTICE
NOTICE
JH-Turbo-Engels1b 28-06-2002 19:56 Pagina 41
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