Cosmetic Care & Maintenance
7-21
7. If marina moored, contact appropriate personnel if signs of galvanic
corrosion appear on your drive system. Ask them to check for stray
electrical current which may be originating from a nearby vessel’s faulty
DC wiring or from a marina pier, piling or dock carrying leaking marina
ground wiring such as a dockside cord partially submerged.
Refer to the propulsion unit manual for additional information.
GALVANIC/STRAY CURRENT CORROSION
Cause/Observed Condition Corrective Action
Sacricial anodes consumed Replace anodes when 30%
consumed
Sacricial anodes not grounded
to drive
Remove anodes, clean contact
surface, reinstall, check for
continuity
Loss of continuity between
underwater parts & ground
Provide good ground connec-
tions
Nearby vessel with stray current Contact appropriate personnel
Remove your vessel from water
Paint on drive heavily worn,
exposing more metal
Prime and repaint or install ad-
ditional anodes
Sacricial anodes painted Remove paint or replace anodes
Drive tilted/anodes out of
water
Leave drive down, install addi-
tional anodes below water
Power trim cylinders only cor-
roded
Provide a good ground to drive,
all parts must be grounded
Corrosion in area of exhaust
outlets
Remove deposits
Corrosion occuring after vessel
is removed from saltwater
Wash exterior and ush interior
with freshwater
Stainless steel parts corroding Clean parts, remove foreign
material, ensure continuity
Underwater drive parts corrod-
ed, sacricial anodes OK
Oxide lm on anode (fresh wa-
ter only) Replace anode
Poor grd. Remove/scrape anode
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