Mercury V-6 series, User Manual

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85
CA439
Corrosion And Corrosion Protection
Whenever two or more dissimilar metals (like those found on the
sterndrive) are submerged in a conductive solution, such as
saltwater, polluted water, or water with a high mineral content, a
chemical reaction takes place causing electrical current to flow
between metals. The electrical current flow causes the metal that is
most chemically active, or anodic, to erode. This is known as
galvanic corrosion and, if not controlled, it will in time cause the need
for replacement of power package components exposed to water.
IMPORTANT: Replace sacrificial anodes if eroded 50% or more.
1
Universal Anodic Plate - serves as a sacrificial anode.
2
Anodic Plate - serves as a sacrificial anode.
3
Block - Is mounted to underside of gimbal housing and serves as
a sacrificial anode.
4
MerCathode System (if so equipped) - Electrode assembly
replaces Anodic block.
System should be tested to ensure adequate output.
Test should be made where boat is moored, using Quicksilver
Reference Electrode and Test Meter. Contact your Authorized
MerCruiser Dealer to arrange for this test.
5
Anode Kit (if so equipped) - Mounted to boat transom. Acts as
a sacrificial anode.