Raw Water System - Cleaning; Risk Of Icing Conditions-Protection Against Frost - Nanni N4.65 Operator's Manual

S08 MAINTENANCE

RAW WATER SYSTEM - CLEANING

RAW WATER SYSTEM CLEANING:
The raw water system must be cleaned to remove the
building up of deposits and salt crystals as soon as
detected or suspected.
1. Stop the engine and close the sea cock valve.
2. Disconnect the hose on the outlet side of the raw
water filter.
3. Place the freed hose end in a container filled with
fresh water. Ensure that the tank is large enough as
the raw water pump must never run without water.
Keep enough water on hand to add up constantly.
4. Check that no one is in the vincinity of the engine,
the propeller and the exhaust outlet. Put the lever in
neutral and start the engine.
5. Let the engine to run for a few minutes at idle. Add up
fresh water in the container before container is being
emptied.
6. Stop the engine.
7. At this stage, the raw circuit is alleged to be cleaned
up. If deposits and salt crystals are still present,
consult your Nanni representative. Do not add up
cleaners additives of your own taste, as metal parts
are prone to fast corrosion if harshly cleaned.
8. Clearly identify all closed valves with labels: on
wheelhouse dashboard, on valves.

RISK OF ICING CONDITIONS-PROTECTION AGAINST FROST

1. Start process after point 8 of previous paragraph
is done. Empty the remaining fresh water left in the
container.
2. Fill the container with engine coolant mix (50% clean
water, 50% anti-freeze).
3. Start the engine and let it run at idle. Add enough
coolant to fill the raw water system with coolant.
4. Stop the engine before the container is empty.
5. Reconnect the hose.
6. Clearly identify all closed valves with labels: on
wheelhouse dashboard, on valves.
7. Drain the coolant mix and refill the raw water circuit
when safe weather conditions are resuming.
WARNING !
Check for leaks before the next engine start.
CAUTION !
When preparing the engine for long term storage, if the
engine is likely to be subject to frost, drain and flush
away all water remaining in the raw filter circuit.
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