Periods Of Engine Inactivity - FNM HPE Series Owner's Manual

3.5 Periods of engine inactivity

If the engine remains inactive for a long period you need to protect it from oxidation and freezing;
®
FNM advises its customers who want to personally carry out the preparatory work to the inactivity of
the engine, to follow the instructions below.
3.5.1 Operations to prepare the engine inactivity
1. Dismount, clean and remount the heat exchangers, preventing in this way to leave them
exposed to oxidizing substances. Check and if necessary replace the zinc anodes.
2. Dismount and spray the sea water pump impeller with silicon grease spray or replace if
necessary.
3. Connect the engine suction line to the fresh water line. Take care to the water flow: the sea
water pump flow at maximum engine speed is around 100 liters / min. Let the engine run for
about 15 min at 800 RPM to aid the circuit cleaning.
4. Fill a proper tank with an opportune mixture of water and antifreeze fluid (depending on the
degree of protection that you would like to offer circuits) and connect the sea water suction
pipe to the tank. Start the engine at 800 RPM and wait for the mixture, sucked by the pump, to
fill completely the sea water circuit (until it comes out of the exhaust riser).
5. Drain the old oil from the sump and fill with clean oil appropriate for cleaning. Then start the
engine (when the engine is still warm, drain the oil that is in the sump, and repeat the operation:
this oil can be used for another two or three times). After the lubrication circuits washing
operation, drain again and fill the engine with new oil, properly added with the proper additives
till the oil level indicated by the dipstick is correct.
102
®
FNM HPE Series