STEYR MOTORS MO114K33, Operation, Maintenance And Warranty Manual

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For 6 Cylinder (Series SE)
There are 2 sacrificial zinc anodes in the raw water cooling system
normally, If an exhaust high riser is used, there is one extra installed
see fig. 28, 29 and 30.
Remove and inspect anodes for galvanic erosion according to the
maintenance schedule.
Replace anode when material loss is 50 - 75 %.
Anti-Corrosion Anodes
If additional electronic equipment is installed, each should have
an individual anode or grounding device and all grounding devices
must be interconnected. Follow recommendations of manufacturers
of equipment.
NOTE: Inspect anodes every 30 days, or more
frequently if used in extremely salty water.
Anode is to be replaced according to the
maintenance schedule.
Boats that connect to an AC power source (shore power) require
protection against increased potential of galvanic and “spray cur-
rent” corrosion. For protection, a galvanic isolator can be installed
in series with the grounding (green) wire in the shore power cable
between the boat and the shore power outlet on the dock. The isola-
tor blocks direct current (DC) flow, but permits the passage of alter-
nating current (AC) thus providing a path for ground fault currents.
NOTE: If a boat is connected to an AC power source
(shore power), and it is not equipped with
a galvanic isolator, the zinc anti-corrosion
anodes may be unable to handle the added
corrosion potential.