7-24
CHAPTER 7
Zinc anodes in saltwater need to be checked more frequently. If the
anodes seem to be requiring frequent replacement there may be a boat
emitting a shore power leak into the water taxing the anodes. This is
especially possible around a marina environment. If this is the case
contact the marina personnel since the current in the water can be
measured by a device. Refer to the engine manufacturer’s manual for
exact location and detailed information regarding anodes. Stern drive
damage due to neglecting anode inspection service is not covered
under the warranty.
SACRIFICIAL ANODE
VOLVO SHOWN
Electrolysis Protection
Sacrifi cial zinc anodes usually found on the stern drive housing, trim
cylinders 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 50%
gone.
Zinc is also used to protect metal that is exposed to saltwater. The salt
causes a galvanic action that decomposes metals.
To Next Page
Loading...
