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Zinc Anodes
Sacri cial zinc anodes are located on the outboard drive housing,
trim cylinders and/or prop sha to protect so er metals exposed to
the water. Electrolysis attacks the least noble metals rst. Because
zinc is a less noble metal, it will decompose before other metals.
Check these zinc anodes periodically and have them replaced when
they are 30% consumed. Notwithstanding, zinc is the most popular
metal used to protect parts that are exposed to saltwater, freshwater
or brackish water.
See the photos below for anode location on your outboard.
Zinc anodes in brackish or salt water
need to be checked more frequently. If
the anodes seem to be requiring frequent
replacement there may be a boat leaking
DC current into the water taxing the
anodes. This is especially possible
around a marina environment. Contact
a marine professional who can measure the galvanic activity with a
special electrode and VOA meter. Refer to the engine manufacturer’s
manual for exact anode location and detailed information.
Inspect the ground leads for tightness if
attached.
Parts damage due to galvanic or stray current
corrosion is not covered under warranty.
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