1 Close the sea cock.
2 Open the drain tap (1) on the heat exchanger and
the tap (2) on the charge air cooler, and drain off
the seawater.
3 Remove the zinc anodes (Z) in the heat exchanger
and in the reverse gear oil cooler.
4 Check the zinc anodes and replace them if more
than 1/3 of their original size has been used up. If
not, clean the zinc anodes with emery cloth to
remove the oxide layer before re-installing them.
IMPORTANT!
Use an emery cloth for cleaning. Do not use steel
tools, since this could impair the galvanic protec-
tion.
5 Install the zinc anodes. Make sure that good met-
allic contact is obtained between the anode and the
casting.
6 Close the drain taps (1 and 2).
7 Open the sea cock before starting the engine.
8 Check that no leakage occurs.
Impeller, Check and Change
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
1 Remove the seawater pump lid, and pull the impel-
ler out with water pump pliers.
2 Check the impeller. If any cracks or other defects
are visible, the impeller must be changed.
3 Lubricate the pump housing and the inside of the
lid with water-resistant grease (which is not aggres-
sive to rubber). The impeller will be easier to work
with if it is put in hot water prior to fitting.
4 Press the impeller in with a circular motion (clock-
wise). The shaft of the pump has an internal thread
(M8). Screw a stud into the end of the shaft and
press the impeller in using a washer and nut. Fit the
cover, using a new O-ring.
5 Open the sea cock.
IMPORTANT!
Always carry a spare impeller on board.
Maintenance
7748887 04-2008 77
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