Section 5 - Maintenance
90-866938081 MAY 2009 Page 123
Anodes and MerCathode System
Anodes help protect against galvanic corrosion by sacrificing their metal to be slowly
eroded instead of the metal components on the drive or vessel.
Corrosion protection for the drive is provided by sacrificial anodes installed on the trim
tabs. Other sacrificial anodes may be mounted on the vessel to ensure against corrosion
of vessel components.
IMPORTANT: Replace the sacrificial anodes if they are eroded 50 percent or more.
Anodes and MerCathode System Locations
Description Location Figure
Trim tab anode
plates
Mounted on the trim tab
The MerCathode system uses a reference electrode and an anode assembly to help
protect against galvanic corrosion. The MerCathode controller is mounted on the
transmission.
The system should be tested to ensure adequate output. The test should be performed
where the boat is moored, using the Quicksilver Reference Electrode and Test Meter. For
testing, contact a Cummins MerCruiser Diesel Authorized Repair Facility or refer to the
appropriate Cummins MerCruiser Drive Service Manual.
Anodes and MerCathode System Locations
Description Location Figure
MerCathode
System
The MerCathode reference electrode
and anode are mounted to the composite
cover on the underside of the drive. The
MerCathode controller is mounted on the
transmission. The controller harness
connects the components.
Other sacrificial anodes
, if equipped, may be mounted on the vessel to protect against
galvanic corrosion. Refer to the operation and maintenance manual provided by the boat
manufacturer for additional information about vessel mounted anodes.
Other Anodes and Locations
Description Location Figure
Anode kit
(if equipped)
Mounted to the boat transom.
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