TP-5986 4/03 17Section 5 Cooling System
5.7 Anticorrosion Zinc Anode
The heat exchanger contains an anticorrosion zinc
anode (plug) to prevent electrolytic corrosion by
seawater.
Check and replace the zinc anode at intervals
recommended by the operation manual’s service
schedule.
Anticorrosion Zinc Anode Replacement Procedure
1. With the generator set cooled, close the seacock,
remove the zinc plug from the heat exchanger, and
drain the coolant into a container.
2. Remove the corrosion on the zinc anode. Replace
the anode when the percent of the zinc remaining is
less than 50% of the length and diameter shown in
Figure 5-5.
3. Clean the threaded opening of the heat exchanger
and coat the threads of the zinc anode with pipe
sealant suitable for marine applications.
4. Install the zinc anode into the heat exchanger.
5. Open the seacock.
6. Refill the cooling system.
7. Start the generator set and check for leaks at the
zinc anode location. The pump is operating if
cooling water flows from the exhaust outlet. If water
is not discharging at the exhaust outlet, stop the
generator set. For seawater pump priming, see the
Prestart Checklist in the operation manual.
TP-5586-3
1
2
1. Diameter: 9 mm (0.34 in.)
2. Length: 43 mm (1.7 in.)
Figure 5-5 Anticorrosion Zinc Anode (Plug)
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