PROPELLER SHAFT MODELS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 8B-5
Checks Made with Boat Out of Water and Shaft Installed
Possible causes for vibration may be propeller shaft, propeller to shaft fit or propeller. All
three can be checked by using the rudder, a strong metal straight edge and a C-clamp.
1. Check installation of propeller to shaft.
a. Remove propeller.
b. Check for chipped or cracked keyway in propeller on shaft without key.
c. Install propeller on shaft without key.
d. Mark the shaft (behind the propeller), then remove propeller.
e. Install the key and propeller. Make sure propeller still lines up with mark. This ensur-
es that key is not oversize and holding the tapers apart. Retighten propeller nut.
f. Ensure key is not sticking out of propeller.
2. Check for propeller shaft being bent behind the strut.
a
b
a-Metal Straight Edge (Held to Rudder with C-Clamp) - Position Corner of
Straight Edge at Center of Shaft. Rotate Shaft One Complete Turn. If Shaft
Wobbles, Replace Shaft.
b-Rudder
3. Check the diameter of all propeller blades. If not the same, repair propeller.
a
b
c
a-Metal Straight Edge (Held to Rudder with C-clamp)
b-Rudder
c-Rotate Propeller One Complete Turn
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