Iveco Marine Diesel Engines, Installation Handbook

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MARCH 2004 COOLING
8.87
MARINE ENGINES INSTALLATION
Water pump
As a rule, the water pump is mounted in and activated by the engine.The rubber or neoprene impeller
is subjected to wear and tear and it needs to be periodically changed, as indicated in the use and main-
tenance manuals.
Easy access to the pump must be guaranteed to carry out maintenance procedures.
Heat exchangers
They are part of the equipment, and enough room for their installation must be considered when set-
ting up the engine. Easy access to heat exchangers is important, since they need periodic control and
cleaning procedures.
NOTE
The dockyard personnel are responsible for the layout and installation of the cooling system before and after
installing the engine.
8.4 KEEL COOLING
Keel cooling system is commonly used in vessels generally used in sandy, muddy or shallow waters to
avoid continuous filter obstructions.
The heat exchanger, through which the coolant runs, is placed under the keel or is incorporated to the
keel itself. It is an exposed underwater exchange unit (fig. 6).
The coolant protecting function is extended to all the installation sections.
The dockyard personnel are responsible for sizing the keel cooling system according to the thermal bal-
ance information supplied by each engine data sheet.
Keel cooling can only be used in engines equipped with circuits for such purpose.
In some cases, secondary circuit keel cooling is possible, in which case it becomes a closed circuit.This
system can only be adopted in the case of engines that have been programmed for this purpose, due
to the fact that the engine cooling system installation is normally sized for water getting into the sec-
ondary circuit with a temperature below 32 ºC. Then, the keel cooling system would be closed. It is
practically impossible to use, except for the case of navigation in very cold water; to avoid the risk of
engine and turbocharger air overheating it is necessary to plan a power-down.