Seawater System - Volvo Penta D3-130A Operator's Manual

Seawater system

The seawater system is the boat's external cooling system. The seawater pump draws in water via the water in-
take through the oil cooler to the seawater pump, after which the water is pumped through the intercooler and heat
exchanger. Finally, the water is pumped into the exhaust pipe elbow, where it is mixed with the exhaust gases.
WARNING! Always close the seawater cock. There is a risk that water will enter while working on the seawa-
ter 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. 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.
Checking/Replacing impeller
WARNING! Risk for water penetration.
1. Remove the cover from the seawater pump and re-
move the impeller. If there are cracks or other de-
fects the impeller must be replaced.
2. Lubricate the pump housing and the inside of the
cover with a little grease for rubber or glycerin.
3. Reinstall the impeller using an anticlockwise
rotating movement. Install the cover together with a
new o-ring.
NOTE! Always clean the seawater filter when repalcing
the impeller, se
Draining the seawater system
1. Connect a hose to the drain nipple on the heat ex-
changer, use a suitable receptacle while draining.
2. Move the hose and continue to drain the coolant
from the drain nipple on the charge air cooler.
3. Move the hose and drain the coolant from the power
steering cooler.
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