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CB793
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 MerCathode 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 Mercury MerCruiser Dealer to arrange for this test.
4 Anode Kit (if equipped) - Mounted to boat transom. Acts as a sacrificial anode.
CA440
5 Trim Cylinder Anodes - are mounted on each trim cylinder.
CB764
6 Bearing Carrier Anode (Bravo One) - is located in front of the propeller, between the front side of the
propeller and the gear housing. Refer to Propeller section in this manual for propeller removal and
installation.
7 Gear Housing Anode (Bravo Two and Three) - is located in the splash plate, just above the propellers.
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