Mercury 15 EFI SeaPro Installation, Operation & Maintenance Manual page 31

GENERAL INFORMATION
• Regular maintenance is scheduled
PROPELLER SELECTION
IMPORTANT: The engines covered in this manual are equipped with an RPM
rev‑limiter that is set to an upper RPM limit. This limit, which is slightly above
the normal operating range of the engine, helps prevent damage from
excessive engine RPM. Once the RPM returns to the recommended operating
RPM range, normal engine operation resumes.
The boat manufacturer and the selling dealer are responsible for equipping the
power package with the correct propeller. Refer to Mercury Marine's web page
https://www.mercurymarine.com/en/us/propellers/selector/#/step‑one.
Select a propeller that will allow the engine power package to operate at or
near the top end of the recommended WOT operating RPM range with a
normal load.
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 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 a loss of RPM.
• Operating in a higher elevation causes a loss of RPM.
• Operating with a dirty boat bottom causes a loss of RPM.
• Operating with increased load (additional passengers, pulling skiers)
causes a loss of RPM.
For better acceleration, such as is needed for waterskiing, use the next lower
pitch propeller. When not pulling skiers, do not operate at full throttle when
using the lower pitch propeller.
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