Seawater System; Seawater System, Draining - Volvo Penta D13 Operator's Manual

Maintenance
80

Seawater System

The seawater system is the engine's external cooling
system. The seawater system sucks in water through
the seawater inlet and pumps it through the heat
exchanger and the reverse gear oil cooler. The system
is protected from galvanic corrosion by means of zinc
anodes located in the heat exchanger and the reverse
gear oil cooler.
WARNING!
Risk of water entry. Water will flow into the boat if any
hose, plug etc. located below the waterline is removed
when the boat is in the water. Always close the sea
cocks. If the boat does not have sea cocks the water
flow must be blocked in a safe manner. If this is not
possible, the boat must be drawn up on land before
work starts.

Seawater System, Draining

The seawater system must be drained in cold weather,
if there is a risk of freezing, to prevent freeze damage.
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
An alternative to draining is to keep the engine bay
above freezing temperature, by means of a fan heater
which is approved for outdoor use.
1 Close the sea cock.
2 Connect a hose to each drain tap before opening
the tap (one at a time).
3 Open the drain taps/remove the drain plugs (S) and
allow the water to run out.
Drain points:
- tap under the heat exchanger
- tap above seawater pump
- plug below seawater pump
IMPORTANT:
Check that all water really does drain out. Deposits
may need to be cleared away, inside the drain plug/
tap.
4 Also drain/empty any auxiliary equipment such as
the seawater filter etc.
5 Close/install all drain taps and plugs before you
leave the boat.
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