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Checking/replacing zinc anodes
Close sea cock before working on cooling
system.
1. Open the drain cock (A) on the reverse gear’s oil
cooler.
2. Unscrew and inspect the zinc anodes (Z) on:
– heat exchanger’s starboard side.
– heat exchanger’s port side
– lower front edge of the charge air cooler (CAC).
– rear of the reverse gear oil cooler
4. Replace the anode if more than 50% of it has been
consumed. Otherwise clean the anode with an
emery cloth to remove the oxide layer.
NOTE! Do not use a wire brush or other steel tools
when cleaning, as these may damage the galvanic
protection.
5. Reinstall the zinc anodes. Ensure that there is
good metallic contact between the anode and the
material.
6. Close the drain cock. Open the sea cock before
starting the engine. Check for leaks.
Removing the seawater pump impeller
Replacing the seawater pump
impeller
(Rubber impeller)
Close sea cock before working on cooling
system.
1. Remove the pump’s end cover. Pull and twist out
the pump impeller counter clockwise using pump
pliers.
2. Clean inside the housing. Lubricate the pump
housing and the inside of the cover with a little
lubricating grease.
3. Push in the new impeller with a clockwise rotating
movement.
4. Reinstall the cover together with a new gasket.
Always keep a spare pump impeller and gasket
on board.
5. Open the sea cock. Start the engine and check for
leaks.
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