Iveco Marine Diesel Engines, Руководство по установке

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MARCH 2004 DRIVE
3.45
MARINE ENGINES INSTALLATION
Rotation direction
First we must say that in marine propulsion the rotation direction is conventionally referred to the
observation from the rear side of the considered object, i.e.:
■
From the flywheel side for the engine
■
From the output shaft for the inverter-reducer
■
From the stern side for the propeller.
According to this rule, the rotation direction of what is observed is defined:
■
Right-hand (left-to-right. clockwise) if it matches with the clock hands,
■
Left-hand (left-handed, anticlockwise/counter-clockwise) if contrary to the above mentioned
movement.
IVECO marine engines are left-handed, therefore this shall be taken into consideration for the choice
of the inverter.
The rotation direction of the inver ter output shaft depends on the type of structure and therefore
there is a difference between the models with the same rotation direction of the engine and those
contrary to it; most modern inver ters-reducers can be used for moving forward and backward
without limitations.
To make the boat move forward, the propeller direction must be the same of the inverter output shaft
direction. In the applications with one engine, the propeller can be made turn in both directions, even if
it is the right propeller to be used more actually (therefore with clockwise rotation at gear forward).The
drift effect due to the application of the single-propeller is usually corrected by regulating the rudder.
In the twin-engine applications, this problem is more marked, therefore it is necessary to adopt counter-
rotating propellers which, to be more efficient, are to be as follows: right propeller with clockwise rota-
tion, left propeller with counter-clockwise rotation. As far as this matter is concerned, you are advised
to make reference to the prescriptions and warnings provided in the suitable installation, use and main-
tenance handbooks supplied by the manufacturer with every inverter.
NOTE
1) Always check the counter-rotation capacity of the inverter before every installation.
2) It is extremely important to ad just the reverse valve. The lever shall make the whole travel to prevent
damaging the clutches.
3) Carefully observe the inverter manufacturer’s prescriptions for its installation.
ROTATION DIRECTION IN THE TWIN-ENGINE APPLICATIONS
1. Left propeller, left-hand rotation - 2. Right propeller, right-hand rotation.
Figure 12
1 2