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Section 5 - Maintenance
IMPORTANT: Replace sacrificial anodes if eroded 50% or more. Mercury strongly recommends avoiding the use of anodes
from other manufacturers. Refer to your Mercury Diesel authorized repair facility for additional information.
Engine Corrosion Protection Components
The engine is equipped with a sacrificial anode located in the end cover of the engine aftercooler to assist in protecting the
engine and the seawater cooling system from corrosion.
Removal
1.
Allow the engine to cool.
Failure to close the seawater inlet or seacock when removing or replacing the anode plugs can lead to water damage. Close
the seacock or remove and plug the seawater inlet hose to prevent water from entering the anode plug holes.
2.
With the engine off, close the seacock, if equipped, or remove and plug the seawater inlet hose.
3.
Drain the seawater system. Refer to Draining the Seawater System.
4.
Remove the anode assembly (anode plug, sealing washer, and the sacrificial anode) from the aftercooler end cover.
Cleaning and Inspection
NOTE: Use sandpaper, fiber brush, or a cleaning pad to remove the deposits from the surface of the anode before trying to
determine the amount of erosion. Do not use a steel brush which might leave deposits that could accelerate corrosion.
1.
Remove the deposits.
2.
Inspect and measure the anode. Compare the measurements to the specifications for a new sacrificial anode and replace
the anode assembly when deteriorated 50%.
NOTE: Sacrificial anodes are available only as an assembly. Replace both the plug and anode as a unit.
a
Sacrificial anode measurements (new)
Length
Page 68
Seawater system anode assembly location
e
b
d
c
NOTICE
Anode assembly
a -
Anode plug
b -
Sacrificial anode
c -
Length
d -
Diameter
e -
Sealing washer
19226
53216
19 mm (3/4 in.)
90-8M0089579
eng
MARCH 2014
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