SERVICE MANUAL NUMBER 28
CORROSION PROTECTION - ALL MODELS
High Reading
Cause
Special Instructions
Stray current corrosion. If an electrical
current flowing along a metal conductor
leaves the metal for a water path, it will
Observe the reading while disconnecting
the electrical components one at a time
until you eliminate the high reading.
cause ionization of the metal, and an area Correct the course of stray current.
of rapid corrosion.
Poor connection between MerCathode
Clean and /or tighten connection. Repair
reference electrode lead (brown) and “R” wiring as required.
terminal on controller.
Faulty MerCathode reference electrode.
Disconnect the reference electrode lead
(brown) from “R” terminal on the controller.
Connect the lead to the positive (+)
terminal of a digital multi-meter (set on
0-2000
millivolt scale). Connect the
negative (–) meter lead to the negative (–)
battery terminal. Note the meter reading;
then, repeat the test using MerCathode
Reference Electrode Tester 76675A1.
Both tools should produce the same
reading. If not, replace the reference
electrode.
Faulty MerCathode controller.
Replace the controller.
Normal Reading But Corrosion is Evident
CORROSION ON THE ENTIRE STERNDRIVE UNIT
Cause
Special Instructions
The sterndrive unit is raised so that
the sacrificial anodic trim tab is out of
the water.
Leave the sterndrive unit in the IN/DOWN
position when the boat is moored to
ensure the trim tab is in the water,
providing protection.
CORROSION PROBLEM DEVELOPED AFTER REFINISHING THE DRIVE UNIT
Cause
Special Instructions
A steel wire brush was used to clean
the aluminum casting. Steel particles
became en-trapped and set up a
small galvanic cell.
Use only a nylon or bristle brush.
PAINT BLISTERING ON DRIVE UNIT
Cause
Special Instructions
Battery charger, using 110 volt
shore power improperly connected to
the battery.
Ensure the charger is connected
correctly.
INDEX
90-863160
MAY 2000
Page 7A-21
| 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