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CD807
EXTERNAL COMPONENTS
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 Anodic Trim Tab - 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 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.
CD679
6 Trim Cylinder Anodes - are mounted on each trim cylinder. To replace the trim cylinder anodes:
A Remove two screws from anode.
B Clean mounting surfaces down to bare metal for proper contact.
C Install new anode. Tighten screws securely.
CD808
7 Bearing Carrier Anode (Alpha) - 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. To replace
the propeller anode:
A Remove propeller.
B Remove two screws from anode.
C Clean mounting surfaces down to bare metal for proper contact.
D Install new anode. Tighten screws securely.
E Reinstall propeller. See Propeller Installation for proper tightening.
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