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Maintenance: Seawater system
Seawater system
The seawater system is the boat’s external cooling system. The seawater pump draws in water via the seawater
intake and pump it on through the charge air cooler, heat exchanger and the reverse gear oil cooler. The system
is protected against galvanic corrosion by zinc anodes located in the charge air cooler, heat exchanger and the
reverse gear oil cooler.
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. 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.
Seawater system. Drain
The seawater system must be drained during cold
weather when there is a risk of freezing to prevent the
system from bursting.
An alternative to draining is to keep the engine room
free from frost using an approved heater fan.
WARNING! Risk of water entering. Close the
seawater cock before starting work on the sea-
water system.
1. Close the seawater cock.
2. Remove the cover on the seawater pump and al-
low the water to run out.
3. Drain from one drain cock (S) at a time and allow
the water to run out until all the drain cocks on the
engine are open.
IMPORTANT! Make sure the coolant really
runs out. It may be necessary to clean away
deposits inside the drain cocks.
4. Drain/empty also any accessories such as seawa-
ter filter, flush/bilge pump, etc.
5. Fit the cover on the seawater pump and connect
all hoses, closing/fitting drain cocks and plugs be-
fore leaving the boat.
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