MerCruiser 3.0 MPI User Manual

Section 5 - Maintenance
Page 78 90-899883272 MARCH 2008
Corrosion Protection
NOTICE
Washing the MerCathode assembly can damage components and lead to rapid
corrosion. Do not use any cleaning equipment such as brushes or high‑pressure washers
to clean the MerCathode assembly.
6211
c
b
a
a - MerCathode reference electrode
b - Do not paint
c - Do not pressure wash
Whenever two or more dissimilar metals (like those found on the sterndrive) 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 and, if not controlled, it will in time cause the
need for replacement of power package components exposed to water. Refer to the Marine
Corrosion Protection Guide (90‑88181301).

MerCruiser 3.0 MPI Specifications

General

Horsepower	135 hp (101 kW)
Ignition	Electronic
Cylinders	4
Aspiration	Naturally Aspirated
Compression Ratio	9.3:1
Full Throttle RPM	4400-4800 RPM
Displacement	3.0L / 181 CID
Fuel System	Multi-Port Injection (MPI)
Bore x Stroke	4.00" x 3.60" (101.6mm x 91.4mm)
Fuel Requirement	87 Octane Minimum
Engine Type	Inline 4
Cooling System	Raw water
Alternator Output	65 amp