TP-5936 7/04 17Section 5 Cooling System
5.8 Anticorrosion Zinc Anode
The heat exchanger contains an anticorrosion zinc
anode (plug) to prevent electrolyte corrosion by the
seawater.
Check and replace the anticorrosion zinc anode at the
intervals recommended in the service schedule. See
Figure 5-7.
GB-250000A-K
1
2
3
1. Anticorrosion zinc anode (seawater drain)
2. Heat exchanger
3. Coolant drain
Figure 5-7 Anticorrosion Zinc Anode Location
Anticorrosion Zinc Anode Replacement
Models
New Anode
Dimensions mm (in.)
Replace When
Percent of Zinc
Remaining is:
32EOZ/27EFOZ 9 (0.34) x 19 (0.75)
<50% of
length/diameter
Figure 5-8 Anticorrosion Zinc Anode Measurements
TP-5586-3
1
2
1. Diameter: 9 mm (0.34 in.)
2. Length: 19 mm (0.75 in.)
Figure 5-9 Anticorrosion Zinc Anode
Inspection and Replacement Procedure
1. Place the generator set controller start/stop switch
in the STOP position.
2. Disconnect the generator set engine starting
battery, negative (--) lead first.
3. With the generator set cooled, close the seacock,
open the engine petcock, and drain the coolant into
a suitable container.
4. Remove the anticorrosion zinc anode from the heat
exchanger. See Figure 5-7.
5. Remove the loose corrosion on the anticorrosion
zinc anode. Replace the anode according to
Figure 5-8 and Figure 5-9.
6. Apply pipe sealant suitable for marine applications
to the threads of the anticorrosion zinc anode
(plug) and install the anode in the heat exchanger.
7. Close the engine petcock and open the seacock.
8. Refill the cooling system.
9. Reconnect the generator set engine starting
battery, negative (--) lead last.
10. Start the generator set and check for leaks at the
anticorrosion zinc anode location. The pump is
running if cooling water flows from the exhaust
outlet. If water is not being discharged at the
exhaust outlet, see the Prestart Checklist,
Seawater Pump Priming, in the operation manual.
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