Section 5 - Maintenance
Page 90 90-8M0074347 eng OCTOBER 2012
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. Refer to the Marine Corrosion Protection Guide (90‑88181301).
Mercury MerCruiser power packages are equipped with anodes to help protect them from galvanic corrosion under moderate
conditions. However, for severe conditions (i.e. when using a stainless steel propeller, docking/mooring in areas with rapid
water flow, etc.), it is recommended that a Quicksilver Anti‑Corrosion Anode Kit and/or a MerCathode System be installed
(some models have a MerCathode System as standard equipment).
1 - Gearcase anodic plate
2 - Ventilation plate anode
3 - Gimbal mounted anodic block
4 - MerCathode System
5 - Anode kit
6 - Trim cylinder anodes
7 - Bearing carrier anodes (Alpha only)
8 - Propshaft Anode (Bravo III standard)
IMPORTANT: Replace sacrificial anodes if eroded 50 percent or more.
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