Nanni N16.900 CR3, Руководство оператора

Страница: 72 / 119

72
CHECKING THE
SACRIFICIAL ANODES
1. Drain the sea water circuit. See the section Draining
the sea water circuit.
2. Check the sacrificial anodes and scrape off all loose
material from them.
3. Renew the sacrificial anode if less than half of it is left.
A new sacrificial anode is 60 mm long with a diameter
of 17 mm.
4. Renew the gasket when fitting.
5. If the sacrificial anodes are very corroded, the mainte -
nance intervals must be reduced.
CHECKING THE SEA WATER
PUMP IMPELLER
1. Drain the sea water circuit. See the section Draining
the sea water circuit.
2. Check that the vanes of the impeller are not heavily
splintered or damaged.
S08 MAINTENANCE
Renewing the sea water pump impeller
Special tool required
Number Designation Illustration
2 443 680 Puller
Note:
If the impeller must be renewed frequently, the cleaning
of the sea water needs to be improved. There should be
a spare impeller on board. The impeller can be deformed
during extended periods of inactivity. Renew the impel-
ler before starting or remove the impeller before longer
periods of stoppage.
1. Thread the puller stud into the rubber impeller using
an internal hexagon key until the stud reaches the bot-
tom.
Note:
Note the direction of rotation of the impeller vanes.
2. Screw the puller into the rubber impeller using the
handle until it reaches the stud. Then continue to screw
until the impeller comes loose.
3. Unscrew the stud.