Iveco Marine Diesel Engines, Installation Handbook

Page: 101 / 132

MARCH 2004 AUXILIARY SERVICES
10.101
MARINE ENGINES INSTALLATION
10.1 OVERVIEW
IVECO engines are fitted to drive all the necessary equipments for onboard services, such as pumps
and electric generators.
Depending on the power required and on the features of the element to be powered, the movement
can be obtained by:
■
Engine flywheel, the engine is not used for propelling but as an auxiliary device.
■
Front pulley.
■
Elements fitted in the distribution gear assembly.
In the first two cases the drive power can be taken from the motor shaft, through a proper pivot joint
or by belt drive. In the third case, the item to be driven is normally a rigid thrust pump directly flanged
to the block.
In any chosen system, it is the dockyard responsibility to lie out the moving elements carefully to avoid
damage to people or objects.
10.2 POWER TAKE-OFF ON THE FLY WHEEL
It is advisable to use systems made to be flanged to the flywheel housing; e.g.:
■
Integral shaft support or “cone joint”. It is a shaft supported by a bearing placed in the cone flanged
to the flywheel housing. It guarantees accurate alignment and rules the power take-off charge.
■
A mechanic clutch, similar to the shaft support, which may have one or more disks, depending on
the power to be transmitted. In relation to the shaft, it has the advantage to interrupt transmission
movement.
On the engine shafts
The connexion to the driven machine must be fitted with a proper pivot joint, able to transmit the rota-
tion torque required and avoid critical torsion speed. Check the joint manufacturing instructions.
The dockyard personnel must align elements according to instructions to avoid vibrations, noises, early
wear and tear, and breakings. Power absorption is regulated by the same criteria described in the chap-
ter on engine choice.
If a cardan transmission is needed, specific pivot joints must be used to join to the shaft directly.
Mounting a generic joint is not accepted, even in reduced coupling angles, unless a supplementary sup-
port is placed between the joint and the shaft.
On cardan use and mounting, refer to Section 3.
In the thrust system, the engine and driven items movements must be considered respectively to assess
the elastic suspension system.
The weight of the joints and adaptor collars added to the flywheel must not surpass the accepted lim-
its shown in the engine technical charts. Check a correct, dynamic balance (on two planes) when the
elements are placed lengthwise along the engine shaft.