Volvo Penta D4 Operator's Manual page 81

2
P0003705
7748934 04-2008
Zinc Anodes, Check and Change
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
1 Close the sea cock(s).
2 Drain the raw water as described in Seawater Sys-
tem, Draining page 78.
3 Remove the zinc anodes from the heat exchanger
(1) and intercooler (2).
4 Check the zinc anodes and replace if consumed to
more than 1/3rd of original size. If not, clean the zinc
1
anodes with Emery cloth to remove the oxide layer
before re-installing them.
IMPORTANT!
Use emery paper. Do not use a wire brush or other
steel tools when cleaning, as these may damage
the galvanic protection.
5 Install the zinc anodes. Make sure there is good
metallic contact between the anode and the metal
contact point.
6 Close the drain cocks.
7 Open the sea cock(s), before starting the engine.
8 Check that there are no leaks.
Impeller, Check and Change
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
1 Remove the cover from the raw water pump and
remove the impeller.
If the impeller is cracked or damaged it must be
replaced.
2 If the pump shaft can be turned by hand, the flange
must be replaced.
3 Lubricate the pump housing and inside of the cover
with a little glycerin.
IMPORTANT!
The impeller will be damaged if other types of lubri-
cant than glycerin are used.
4 Press the impeller in with an anti-clockwise rotating
movement.
5 Fit the sealing washer on the center bearing of the
shaft. Install the cover with a new O-ring.
Maintenance
79