30
Twin engine installation
XDP drive unit
Duoprop drive units have counter-rotating propellers; it is
not necessary to change drive unit rotation. The propellers
operate in sets:
•
The forward propeller is left-hand and rotates counter-
clockwise.
•
The rear propeller is right-hand and rotates clockwise.
Propellers are installed in sets. You may purchase the pro-
pellers individually, but make sure they are the same size
and shaft (e.g., F7 front and rear). Do not mix or split sets.
NOTE!
XDP drive units have counter-rotating propellers.
See above for a more detailed description.
Caution!
Never exchange a right-hand propeller with a left-hand
propeller. This would result in your boat being propelled
in reverse when the engine is operating in forward gear,
and forward when the engine is operating in reverse gear.
Whenever you have the propellers serviced, shift into
FOR-
WARD or REVERSE at idle speed and determine if the boat
moves in the direction indicated by the position of the control
handle. If the boat moves opposite to the direction indicated
by the control handle, the propellers are switched.
Your Volvo Penta sterndrive is equipped with a propellers
designed to give top performance and maximum economy
under all operating conditions. To obtain peak performance,
the engine RPM at full throttle must fall in the specified oper-
ating range at normal load conditions at favorable/best trim
settings (trim set to provide the most speed with the smooth-
est ride).
•
If full throttle RPM is
below
the recommended operat-
ing range, propeller(s) with
lower
pitch should be used.
•
If full throttle RPM is
above
the recommended operat-
ing range, propeller(s) with
higher
pitch should be used.
To provide your boat with the best engine life, fuel economy,
and performance, select the correct propeller to allow the
engine to run at full throttle in the recommended operating
range. Your Volvo Penta dealer will help you to choose the
correct propeller(s) for your application.
Caution!
Replace a damaged propeller right away. Operate your
boat with extreme caution if a propeller is damaged while
you are boating.
Do not operate a DP model with only one propeller, as this
will cause damage to propeller shafts.
Engine
Full Throtlle Operating Range(RPM)
4.3OSi-C(F) ...................................................... 4400 - 4800
5.0OSi-C(F) ........................................................ 4600-5000
5.7OSi-B(F) ........................................................ 4600-5000
5.1OSXi-B(F) ..................................................... 4600-5000
Summary of Contents for 4.3OSi-C
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