Volvo Penta TAMD74A, Operator'S Manual

Page: 47 / 76

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Maintenance: Seawater system
Zinc anodes. Check/Change
WARNING! Risk of water entering. Close the sea-
water cock before starting work on the seawater
system.
1. Close the seawater cock.
2. Open drain tap (1) on the reverse gear oil cooler
and drain off the sea water.
3. Remove the zinc anode in the reverse gear oil
cooler (2), in the heat exchanger (3) and in the in-
tercooler (4).
NOTE! The sea water in the heat exchanger and
intercooler is drained at the same time.
4. Change the anode if less than 50% of its original
size. Otherwise, clean the anode with emery cloth
to remove the layer of oxide.
IMPORTANT! Do not use a wire brush or
other metal tool for cleaning as this can im-
pair the galvanic protection.
5. Fit the zinc anodes. Make sure there is good con-
tact between the anode and the metal goods.
6. Close the drain cock (S).
7. Open the seawater cock before starting the en-
gine.
8. Make sure there are no leaks.
Seawater filter. Check/Clean
The seawater filter is an accessory and is available in
two models.
If the water the boat is in is severely polluted, con-
tains large amounts of seaweed, etc., the filter must
be checked more often than is specified in the main-
tenance schedule. The filter can otherwise become
clogged and the engine overheat.
WARNING! Risk of water entering. Close the
seawater cock before starting work on the sea-
water system.
1. Close the seawater cock.
2. Remove the cover (1) and lift up the insert.
3. Clean the insert and the housing (2).
4. Assemble the parts as illustrated below. Inspect
gaskets and O-ring. Change if necessary.
5. Open the seawater valve and check for leaks.
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