Zinc Anodes
Sacrifi cial zinc anodes are located on the outboard drive housing, trim
cylinders and/or prop shaft to protect softer metals exposed to the
water. Electrolysis attacks the least noble metals fi 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 electric 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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