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Seawater system. Flush cleaning and
corrosion inhibition
When laying up during winter (or out of season), the
seawater system must be flushed clean of all depos-
its and salt crystals. It must also be treated to pro-
tect against internal corrosion.
WARNING! Risk of water penetration. This
work must be carried out with the boat on dry
land.
Approaching or working on a running engine is
dangerous. Watch out for rotating components
and hot surfaces.
Glycol is harmful to health (dangerous if
ingested). Collect used and drained glycol and
take it to a proper disposal site.
1. Open the seawater cock (1).
2. Disconnect the hose at the seawater cock (1) or
on the outlet side of the sea water filter (2) (if the
engine is equipped with such a filter).
3. Place the free end of the hose in a bucket of
fresh water. Fill the system.
IMPORTANT! The impeller will be damaged if
it runs dry.
4. Check that there is nobody close to the propeller
and there is nothing that will get splashed behind
the exhaust outlet.
5. Set the control lever to neutral. Start the engine.
Let the engine run at fast idle for a few minutes.
Stop the engine.
6. Fill the bucket with an anti-freeze mixture (50%
Volvo Penta glycol and 50% fresh water). Collect
the mixture from the system in a suitable contai-
ner.
7. Start the engine and let it idle. Stop the engine just
before the mixture is finished.
Repeat as necessary until the entire system has
been flushed with the mixture.
8. Reconnect the hose.
This mixture prevents corrosion and protects against
freezing. It must be left in the seawater system
throughout the laying-up period. Drain the mixture just
before the boat is launched.
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Maintenance: Seawater system
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