TP-6591 10/1334 Section 3 Scheduled Maintenance
3.7.7 Anticorrosion Zinc Anode
The heat exchanger on these models contains an
anticorrosion zinc anode (plug) to prevent electrolytic
corrosion by seawater.
Check and replace the anticorrosion zinc anode at
intervals recommended in the service schedule.
Depending upon operating conditions and seawater
properties, the anticorrosion zinc anode may require
more frequent replacement. See Section 1—Service
Views for location and use the following procedure.
Anticorrosion Zinc Anode Replacement Procedure
1. With the generator set cooled, close the seacock,
remove the anticorrosion zinc plug from the heat
exchanger, and drain the coolant into a suitable
container.
2. Use a wire brush to remove the loose corrosion on
the anticorrosion zinc anode. Replace the anode
according to Figure 3-15 and Figure 3-16.
Anticorrosion Zinc Anode Replacement
Models
New Anode
Dimensions mm (in.)
Replace When
PercentofZinc
Remaining Is:
5/7.5/10EKD
and
4/6/8EFKD
9 (0.34) x 43 (1.7)
<50% of
length/diameter
Figure 3-15 Anticorrosion Zinc Anode (Plug)
Measurements
TP-5586-3
1
2
1. Diameter: 9 mm (0.34 in.)
2. Length: 43 mm (1.7 in.)
Figure 3-16 Anticorrosion Zinc Anode (Plug)
3. Clean the threaded hole of the heat exchanger and
coat the threads of the anticorrosion zinc anode
(plug) with pipe sealant suitable for marine
applications. Install the anticorrosion zinc anode
into the heat exchanger.
4. Open the seacock. Refill the cooling system.
5. Start the generator set and check for leaks a t the
anticorrosion zinc anode location. The pump is
operating if cooling water flows from the exhaust
outlet. If water is not discharging at the exhaust
outlet, see Prestart Checklist—Seawater Pump
Priming.
3.7.8 Seawater Outlet
Check the seawater outlet at the interval specified in the
service schedule. See Figure 3-14 for location.
Remove any obstructions to keep the outlet clear.
3.8 Ignition System
Service spark plugs at the interval specified in the
service schedule using the following procedure.
Spark Plug Service Procedure
1. Remove spark plug wires by grasping the spark
plug boot and turning slightly while pulling. Do not
pull the wire. Pulling on the wire rather than the
boot may damage the wire or terminal.
2. Loosen the spark plug with a ratchet and 5/8-in.
spark plug socket with a rubber insert to prevent
spark plug damage.
3. Use compressed air to remove dirt from around
each spark plug to prevent dirt particles from falling
into the combustion chamber.
4. Remove spark plugs, one at a time, and examine.
Identify a normal spark plug in good operating
condition by observing a light tan or gray deposit on
the firing tip. See Figure 3-17 to evaluate engine
condition by color/condition of a problem spark
plug.
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