1-6 - GENERAL INFORMATION and SPECIFICATIONS 90-817643R1 DECEMBER 1996
Propeller Selection
1. Select a propeller that will allow the engine to operate
at or near the top of the recommended full throttle RPM
range (listed in “Specifications,” preceding) with a nor-
mal load. Maximum engine speed (RPM) for propeller
selection exists when boat speed is maximum and trim
is minimum for that speed. (High RPM, caused by an
excessive trim angle, should not be used in determin-
ing correct propeller.) Normally, there is a 150-350
RPM change between propeller pitches.
2. If full throttle operation is below the recommended
range, the propeller MUST BE changed to one with a
lower pitch to prevent loss of performance and possi-
ble engine damage.
3. For better acceleration, such as is needed in water
skiing, changing to a different pitch to increase the
engine speed to 500 RPM above the recommended
range is advised. Continuous operation above the rec-
ommended maximum RPM, however, is not permissi-
ble.
4. After initial propeller installation, the following common
conditions may require that the propeller be changed
to a lower pitch:
a. Warmer weather and great humidity will cause an
RPM loss.
b. Operating in a higher elevation causes an RPM
loss.
c. Operating with a damaged propeller or a dirty boat
bottom or gear housing will cause an RPM loss.
d. Operation with an increased load (additional pas-
sengers, equipment, pulling skiers, etc.).
Propeller Installation
! WARNING
To avoid accidental starting, which could result in per-
sonal injury, remove spark plug leads from spark
plugs before working near propeller. Place a block of
wood between the anti-ventilation plate and propeller
to protect hands from propeller blades while tighten-
ing propeller nut.
!
CAUTION
If the propeller moves forward-and-aft on the propeller
shaft (is loose), retighten the propeller nut. Operation
with a loose propeller could cause damage to the
thrust hub and gear housing during acceleration, de-
celeration or when shifting gears.
IMPORTANT: To assure that the propeller remains se-
cure on the shaft during the season, periodically
check propeller shaft nut for tightness.
1. To aid in future removal of the propeller, liberally coat
the propeller shaft spline with one of the following
Quicksilver lubricants:
– Anti-Corrosion Grease
– 2-4-C Marine Lubricant
– Special Lubricant 101
2. Place forward thrust hub on propeller shaft.
50551
a
b
a - Thrust Hub
b - Propeller Shaft
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