TROUBLESHOOTING
SERVICE MANUAL NUMBER 28
Corrosion On Underwater Parts, With MerCathode Or Impressed Current
Protection
DRIVE CORRODING
Cause
Special Instructions
Poor connection between reference
electrode (BRN) lead or anode
(ORN) lead and MerCathode
controller.
Clean and/or tighten connection.
Repair wiring.
Disconnect reference electrode lead
(BRN) from the controller “R”
terminal. Connect the lead to positive
(+)
terminal of a digital multi-meter (set
on 0-2000 millivolt scale). Connect
negative (–) meter lead to negative (–)
battery terminal. Note meter reading;
then repeat the test with a test
silver/silver chloride reference
electrode held behind the drive. The
same reading should be obtained in
both cases. If not, replace the
reference electrode.
Faulty MerCathode reference
electrode.
With anode and reference electrode
leads connected to controller, connect
a jumper wire between “R” and
negative(–) terminals on controller.
Connect positive (+) lead of volt meter (set
on 0-20 scale) to “A” terminal on controller.
Connect the negative (–) meter lead to the
negative (–) controller terminal. Reading
Faulty MerCathode controller.
shouldD Freshwaterbe as follows:Areas = 11.5 volts
minimumD Seawater Areas = 3.55 volts
minimum
If the reading is low, replace the
controller.
MerCathode system overpowered by
large quantity of stainless steel below
the waterline.
Too much cathode (such as stainless
steel).
Loss of continuity between sterndrive
components and ground.
Ensure continuity (check continuity
wires and washers).
Sacrificial anodes consumed, painted
or inoperative.
Replace anodes.
MerCathode reference electrode or
anode painted.
Remove paint or replace anode or
MerCathode reference electrode.
INDEX
Page 1C-30
90-863160 MAY 2000
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | MerCruiser Sterndrives 90-863160 |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 3 out of 3)
Marine readers have rated Mercury MerCruiser Bravo Outdrives Sterndrives Marine Engines Service Manual Number 28 3.0 out of 3.0 based on 1 product reviews. I could not find any mention of the seawater pump assembly.
Maybe I have the wrong unit