36
Impeller. Checking/Replacing
WARNING! Risk for water penetration. Close the
sea cock.
Close the sea cock. Remove cover (1) on the
seawater pump. Remove impeller (2). If there are
cracks or other defects the impeller must be re-
placed. Lubricate the pump housing and the inside of
the cover with a little waterproof grease for rubber.
Reinstall the impeller using a clockwise rotating
movement. Install the cover together with a new
gasket. Open the sea cock.
IMPORTANT! Always carry a spare impeller on
board.
1
2
Maintenance: Seawater system
Seawater system
The sea water system is the external cooling system of the engine. On engines with a stern drive, the sea water
pump sucks in water via the drive, after which the water passes the sea water filter (optional extra) before it is
pumped through the heat exchanger. Finally, the water is pumped out into the exhaust elbow pipe, where it is
mixed with the exhaust gases.
On engines with a reverse gear, the sea water pump suck in water via the sea water inlet, after which the water
passes the sea water filter (optional extra) and the reverse gear oil cooler before it is pumped through the heat
exchanger. Finally, the water is pumped out into the exhaust bend, where it is mixed with the exhaust gases.
WARNING! There is a risk that water will enter while working on the seawater system (if the boat is in the
water). Water may flow into the boat if a hose, plug or similar object located below the waterline is removed.
So always close the seawater cock. If the boat does not have a seawater cock, the flow of water must be
stopped in a safe manner. The boat must be brought up on land if this is not possible.
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