Volvo Penta D2-75 Operator's Manual page 40

Maintenance: Seawater system
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38
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.
1
1. Open the seawater cock (1).
2. Disconnect the hose at the seawater cock (1) or
3. Place the free end of the hose in a bucket of
4. Check that there is nobody close to the propeller
5. Set the control lever to neutral. Start the engine.
6. Fill the bucket with an anti-freeze mixture (50%
7. Start the engine and let it idle. Stop the engine just
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.
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.
on the outlet side of the sea water filter (2) (if the
engine is equipped with such a filter).
fresh water. Fill the system.
IMPORTANT! The impeller will be damaged if
it runs dry.
and there is nothing that will get splashed behind
the exhaust outlet.
Let the engine run at fast idle for a few minutes.
Stop the engine.
Volvo Penta glycol and 50% fresh water). Collect
the mixture from the system in a suitable contai-
ner.
before the mixture is finished.
Repeat as necessary until the entire system has
been flushed with the mixture.