FNM HPE Series Owner's Manual page 90

3.3.12 Sea water pump impeller inspection and replacement
Periodic maintenance: performed by qualified personnel equipped with appropriate work tools
and adequate means of protection.
The position of the sea water pump varies depending on the model of your engine. You can verify the
position in paragraph 1.6 - Main components of FNM
shaft is driven in rotation by the movement of the crankshaft. The function of the sea water pump is to
draw water from the sea intake and to put it into circulation in the cooling systems (heat exchangers,
exhaust manifold, etc..). Water circulation is ensured by the rotation of a rubber impeller (nitrile) into
the center housing of the pump. The indications on the suction side are shown on the cover of the
pump.
The impeller never rotates without water for more than 1 minute, dry rotation increase the
impeller temperature and quickly wears the vanes.
Pay attention to the extreme conditions of the impeller to prevent engine overheating.
It is necessary that you have a backup impeller on board to replace in case of damage during
navigation.
To dismount the impeller :
1. Stop the engine and close the sea water intake valve.
2. Remove the fastening screws from pump cap (take care to the gasket).
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engine, HPE Series – on page 15. The pump
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FNM HPE Series