Propellers Your Volvo Penta sterndrive should be equipped with propeller(s) that are designed to give top performance and maximum economy under all operation conditions. To obtain peak performance, the engine RPM AT FULL THROTTLE must fall in the specified operating range at normal load conditions at favourable/best trim settings. If full throttle RPM is below the recommended operating range, propeller(s) with less pitch should be used. Should full throttle RPM exceed the recommended range, install propeller(s) of higher pitch. Selecting the correct propeller(s) to allow the engine to run at full throttle in the recommended operating range will give the best engine life, fuel economy and performance. See your Volvo Penta dealer for help in determining the correct propeller(s) for your application.
7738812 - Downloaded from www.volvopenta.com 7/10/2006 5:02:36 AM
IMPORTANT! Engine damage can result from incorrect propeller selection. A damaged propeller must be changed without delay. Operate with extreme caution if a propeller is damaged. Do not operate DP models with only one propeller, this can cause damage to propeller shafts.
Propeller selection, SX drive When you choose a propeller, it is important to know whether it should be for right-hand or left-hand rotation. The directions of rotation are shown in the illustration. Boat yards normally use right-hand rotation, and have set the trim fin for right-hand rotation.
A=Right-hand installation
B=Left-hand installaion
For trim fin adjustment, please refer to the SX, DP-S Drive, Trim fin, adjustment section.
IMPORTANT! In twin installations, one propeller should be for right-hand rotation and the other one should be for left-hand rotation. Both should be of the same size (same diameter) and have the same pitch.
Propeller check, SX drive After having the propellers serviced, shift into FORWARD 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 the direction indicated by control handle, the propellers are switched. WARNING! Failure to perform the above test could result in loss of control.
70
