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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. See 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: Using sandpaper, fiber brush, or cleaning pad, remove the deposits from the surface of the anode before trying to
determine the amount of erosion. Do not use a mild 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
Diameter
3.
Discard the sealing washer.
90-8M0069751
APRIL 2012
eng
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
Section 5 - Maintenance
25583
19 mm ( 3/4 in.)
16 mm ( 5/8 in.)
Page 83
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