UNSCHEDULED MAINTENANCE
22-1
Unscheduled Maintenance
Propeller damage is caused by striking solid objects. If the propeller is not rotating at the time it strikes a solid object,
the damage is usually confined to just one blade and may be difficult to see. If the propeller is rotating when it strikes an
object, usually damage can easily be seen on all blades.
Checking/repairing propellers
Step 1: Ensure the engine is OFF and the engine safety
starting switch disconnected. Place the throttle/shift con-
trol lever in forward gear.
Step 2: Clamp a small rule scale to the shaft strut, parallel
to the shaft so that the end of the scale is 3/32-inches from
the leading edge of a propeller blade.
Step 3: Rotate the propeller slowly. There should be no
more than 3/32-inch variance between the blades. If the
propeller is damaged, see your MasterCraft dealer.
To repair minor nicks and dings in a propeller
(MasterCraft makes no claims to this methodology)
Step 1: Remove the propeller from the boat.
Step 2: Use a small ball-peen hammer and anvil to
carefully straighten out the ding to the original contour
of the blade.
Step 3: File the area to remove rough edges.
Step 4: Re-install as outlined in Changing Propellers in-
structions. If a vibration is detected, have the propeller re-
placed. Do not use a propeller that is the source of a
vibration. Further drive-train damage could result and
this will not be covered under warranty.
Changing Propellers
Step 1: Ensure the engine
is OFF and the engine
safety starting switch dis-
connected. Place the
throttle/shift control lever
in forward gear.
Step 2: Remove and dis-
card the cotter pin.
Step 3: Remove the pro-
peller nut.
Step 4: Tap the center
hub of the propeller with
a rubber mallet to release
the propeller. Inspect the shaft and propeller splines
for damage.
Step 5: Thoroughly clean and apply a light coat of
waterproof marine multi-purpose grease to the
splined area of the shaft and propeller.
Step 6: Align the splines and carefully install
the propeller onto the shaft. DO NOT FORCE
IN PLACE.
Step 7: Install the propeller nut and torque to 50-
ft-lbs.
Step 8: Install a new cotter pin and bend the ends
around the shaft to lock the propeller on the shaft.
Checking speedometer calibration
For tournament use and practice, accurate
speedometer readings are a must. To calibrate the
speedometer you need an accurately measured
course of 850 feet and a certified stopwatch accu-
rate to a thousandth of a second. To calibrate to
AWSA official-tournament rules:
Step 1: Approach the course at an indicated 36
miles per hour (MPH). Hold the speed steady and
have an observer check the course time with a
stopwatch.
Step 2: If the course time is between 15.88 and
16.28 seconds, no adjustment is necessary. If the
course time is not within tolerance, the adjustment
switch is on the lower right panel of the dash.
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