Sacrificial Anodes - Volvo Penta IPS Operator's Manual

Maintenance
92
Inspection/replacing corrosion protection

– Sacrificial anodes

Check the sacrificial anodes regularly. There are two
anodes per stern drive; one is fixed to the drive and the
other to the transom. Refer to the illustrations. Replace
an anode when approximately 1/3 of it has corroded
away.
When the boat is stored ashore, corrosion protection
deteriorates due to sacrificial anode oxidization. Even
new anodes oxidize on the surface. The anodes must
be cleaned before the boat is launched.
The anode in the exhaust outlet is made of iron and
does not need cleaning.
IMPORTANT!
Use emery paper. Do not use a wire brush or other
steel tools when cleaning, as these may damage the
galvanic protection.
Replacing corrosion protection
All anodes are secured by bolts or nuts. Remove the
anode retaining bolts or nuts. Clean the contact sur-
face and secure the new anode. Tighten the new
anode so that it makes good electrical contact.
ACP, Active Corrosion Protection
Boats equipped with ACP (option) have a zinc anode
integrated in the ACP unit; see illustration. Replace the
anode when about 1/3 has corroded away.
7748921 04-2008