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7.
Install the strainer cover by turning it clockwise by hand. Ensure that the strainer cover O‑ring is properly located and
moderately compressed when the cover is installed. Do not overtighten.
c
b
a
8.
If the boat is out of the water. Perform an operational inspection of the seawater cooling system after cleaning the seawater
strainer.
a.
Cooling water must be supplied to the engine seawater pump. Refer to Flushing the Seawater System regarding
cooling water supply when this service is performed with the boat out of the water.
b.
Start the engine and allow the seawater system to fill and the engine to reach normal operating temperature.
c.
Run the engine at a fast idle between 600 and 1400 RPM. Monitor engine temperature to confirm proper operation of
the cooling system.
d.
Inspect the seawater system for leaks maintaining a fast idle engine speed between 600 and 1400 RPM.
e.
Tag the keys, record the service in the maintenance log, or otherwise make note that a proper operational inspection
of the seawater system must be performed before returning the boat to service.
9.
If the boat is in the water, perform an operational inspection of the seawater cooling system.
a.
Open the seacock, if equipped, or remove the plug and reconnect the seawater inlet hose.
b.
Start the engine and allow the seawater system to be filled and the engine to reach normal operating temperature.
c.
Check the seawater cooling system for leaks within an RPM range of 600 to 1400 RPM.
d.
Carefully monitor the engine operating temperature to ensure that it remains in normal operational range and that the
seawater cooling system is functioning properly.
Engine Seawater Pump Inspection
IMPORTANT: Mercury strongly recommends that this service be performed by a Mercury Diesel authorized repair facility.
Remove and inspect the engine seawater pump at the interval specified in the Maintenance Schedule. See your Mercury
Diesel authorized repair facility.
Corrosion Protection
General Information
Whenever two or more dissimilar metals (such as those found on this power package) 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 erosion is known as
package components exposed to water.
To help control the effects of galvanic corrosion, Mercury power packages come with several sacrificial anodes and other
corrosion protection devices. For a more comprehensive explanation of corrosion and corrosion protection refer to the Marine
Corrosion Protection Guide.
90-8M0089579
MARCH 2014
eng
25832
galvanic corrosion and, if it is not controlled, it will eventually cause the need for replacement of power
a -
Seawater inlet
b -
Seawater outlet
c -
Seawater strainer cover
Section 5 - Maintenance
Page 67
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