TROUBLESHOOTING
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000 Page 1C-29
Corrosion Protection
NOTE:Refer to “MerCathode Controller Wiring Diagram.”
Corrosion On Underwater Parts, Without MerCathode Or Impressed Current
Protection
Cause Special Instructions
Sacrificial anode(s) consumed.
Replace anode(s) when 50%
consumed.
Stainless steel propeller installed.
Add MerCathode (impressed current
protection) or additional sacrificial
anodes.
Sacrificial anode(s) not grounded to
drive.
Remove anode(s), clean contact
surface, reinstall and check continuity.
Loss of continuity between underwater
parts & ground.
Provide good ground connections.
Shore power causing overload of
anode(s) and/or MerCathode.
Disconnect shore power or install
Quicksilver isolator.
Paint on drive heavily worn
(exposing more metal).
Prime and repaint and/or install
additional anode(s).
Sacrificial anode(s) painted. Remove paint or replace anode(s).
Drive tilted so far that anode(s) are out
of the water.
Leave drive down, install additional
anode (below waterline) or transom
mount a MerCathode.
Only power trim cylinders are corroded.
Provide good ground to drive. All parts
must be grounded.
Corrosion in area of exhaust outlets.
Exhaust deposits can cause
corrosion.
Remove deposits with marine or auto
wax.
Corrosion occurring after unit removed
from saltwater.
Wash exterior and flush interior with
fresh water.
Corrosion and/or salt build up between
mating parts.
Exclude moisture from between mating
parts with Quicksilver 2-4-C with Teflon.
Stainless Steel parts corroding:
Tightly wrapped fishing line or foreign
material excludes oxygen, causing
corrosion.
Iron particles, such as from a wire brush,
cause rusting.
Propeller pitting can occur if electrical
continuity is lost.
Clean parts, remove foreign material,
ensure continuity.
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