166
3. Periodically remove vessel from water and clean/
pressure wash all drive, anode and hull bottom ar-
eas to remove growth.
4. Ensure vessel is using the correct anode metal
for the body of water that it is moored. See the en-
gine manufacturer’s manual for more information
or contact an authorized dealer.
5. Ensure that the drive is completely “in” down
to provide more complete anode protection when
vessel is moored.
6. Do not attempt to use magnesium anodes in
saltwater. They will provide over protection.
7. If marina moored, contact appropriate person-
nel if signs of galvanic corrosion appear on your
drive system. Ask them to check for stray electri-
cal current which may be originating from a nearby
vessel’s faulty DC wiring or from a marina pier, pil-
ing or dock carrying leaking marina ground wiring
such as a dock side cord partially submerged.
GALVANIC/STRAY CURRENT CORROSION
Cause/Observed Condition Corrective Action
Sacrificial anodes consumed Replace anodes when 30%
consumed
Sacrificial anodes not
grounded to drive
Remove anodes, clean con
-
tact surface, reinstall, check
for continuity
Loss of continuity between
underwater parts & ground
Provide good ground
connections
Nearby vessel with stray
current
Contact appropriate person
-
nel
Remove your vessel from
water
Paint on drive heavily worn,
exposing more metal
Prime and repaint or install
additional anodes
Sacrificial anodes painted Remove paint or replace
anodes
Drive tilted/anodes out of
water
Leave drive down, install ad
-
ditional anodes below water
Power trim cylinders only
corroded
Provide a good ground
to drive, all parts must be
grounded
Corrosion in area of exhaust
outlets
Remove deposits
Corrosion occurring after
vessel is removed from
saltwater
Wash exterior and flush inte
-
rior with freshwater
Stainless steel parts
corroding
Clean parts, remove foreign
material, ensure continuity
Underwater drive parts cor
-
roded, sacrificial anodes OK
Oxide film on anode (fresh
water only) Replace anode
Poor ground. Scrape anode
To Next Page
Loading...
