Corrosion Protection Troubleshooting; Corrosion On Underwater Parts, Without Mercathode Or Impressed Current Protection - Mercury BRAVO Service Manual

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