Seawater System - Volvo Penta D2 Series Operator's Manual

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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Maintenance: Seawater system
Impeller. Checking/Replacing
WARNING! Risk for water penetration. Close
the sea cock.
Close the sea cock. Remove cover () on the seawa-
ter pump. Remove impeller (). If there are cracks or
other defects the impeller must be replaced. Lubri-
cate the pump housing and the inside of the cover
with a little glycerin. Reinstall the impeller using a
clockwise rotating movement. Install the cover togeth-
er with a new gasket. Open the sea cock.
IMPORTANT! The impeller will be damaged if
other types of lubricant than glycerin are used.
IMPORTANT! Always carry a spare impeller on
board.
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