FNM HPE Series Owner's Manual page 94

The coolant fluid is polluting. Use appropriate precautions
The sea water freezing in the cooling circuit causes damage to the circuit itself.
During the winter in areas where temperatures are particularly cold you should follow the instructions
below to avoid the circuit freezing when the engine is not used for short periods.
1. Drain the circuit.
2. Close the sea water intake valve.
3. Unscrew the zinc anodes on the cover of the water to water exchanger and on the intercooler
cover. Facilitate the release of water from the circuit by unscrewing also the anode on the
cover of the exhaust manifold.
90
Figure 38 - Casings for cleaning the circuit in applications with stern drive
to avoid releasing it into rivers or the sea!
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FNM HPE Series