GASOLINE STERNDRIVE INSTALLATION MANUAL
90-860172011
Page 101 of 137
Propeller Selection
GENERAL INFORMATION
IMPORTANT: Installed propeller must allow engine to run at its specified maximum
WOT rpm. Use an accurate service tachometer to verify engine operating rpm.
It is the responsibility of the boat manufacturer and/or the selling dealer to equip the power
package with the correct propeller. Refer to Quicksilver publication - Everything You Need
To Know About Propellers P/N 90-8614492. Specified engine WOT and operating rpm
range are listed in the Mercury MerCruiser Operation, Maintenance and Warranty Manual
attached to the engine.
If full throttle operation is below the recommended range, the propeller must be changed
to prevent loss of performance and possible engine damage. On the other hand, operating
an engine above the recommended operating rpm range will cause higher than normal wear
and/or damage.
After initial propeller selection, the following common problems may require that the
propeller be changed to a lower pitch:
•
Warmer weather and greater humidity cause an rpm loss.
•
Operating in a higher elevation causes an rpm loss.
•
Operating with increased load (additional passengers, pulling skiers, etc.).
For better acceleration, such as is needed for water skiing, use the next lower pitch
propeller. However, do not operate at full throttle when using the lower pitch propeller but
not pulling skiers.
Because of the many variables of boat design, only testing will determine the best propeller
for a particular application. Available propellers are listed in the Mercury Precision Parts /
Quicksilver Accessories Guide.
See BOAT IN THE WATER TESTS, Maximum RPM Test at the back of this manual.