FNM HPE Series Owner's Manual page 92

3.3.13 Sea water circuit cleaning
Periodic maintenance: performed by qualified personnel equipped with appropriate work tools
and adequate means of protection.
Keep sea water circuits clean from salt deposits and from any external intrusion to ensure proper
cooling of the engine.
In any case you should run the engine with fresh water for at least 5 minutes every 50 hours, in order
to prevent the accumulation of salt deposits in the cooling circuits related to the sea water section.
The seawater system cleaning must be done even during the winter season operations.
After flushing the circuits and after circulated fresh water in the cooling circuit (sea water circulation
side), to avoid freezing during long rest of the engine in cold weather conditions, we recommend to:
1. Close the sea water tap
2. Open the sea water filter cap
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FNM HPE Series