Corrosion Protection; Corrosion Information; Maintaining Ground Circuit Continuity - Mercury TDI 3.0L Owner's Operation And Maintenance Manual

Section 4 - Maintenance
7. Install the seal and cover using the screws and washers. Do not overtighten the cover screws.
b
f
c
8. Open the seacock, if equipped, or remove the plug and reconnect the seawater inlet hose.
9. Upon first starting the engine, check for leaks or air in the system that would indicate an external leak.

Corrosion Protection

Corrosion Information

Whenever two or more dissimilar metals are submerged in a conductive solution, such as saltwater, polluted water or water
with a high mineral content, a chemical reaction takes place causing electrical current to flow between metals. The electrical
current flow causes the metal that is most chemically active, or anodic, to erode. This is known as galvanic corrosion. For more
information contact your authorized Mercury MerCruiser dealer.

Maintaining Ground Circuit Continuity

The transom assembly and sterndrive are equipped with a ground wire circuit to ensure good electrical continuity between the
engine, transom assembly, and sterndrive components. Good continuity is essential for the anode and the MerCathode system
to function effectively.
Inspect all ground circuit components for loose connections and broken or fraying wires.
Models equipped with a separate ground wire must have the wire connected between the engine flywheel housing and the
transom plate.
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a
a - Screws and washers
b - Cover with glass
c - Strainer
d - Housing
e - Drain plug and sealing washer
f - Seal
d
e
12863
b
a
c
7007
a - Engine flywheel housing bolt
b - Ground wire
c - Inner transom plate grounding screw
90-8M0145546 MAY 2018
eng