PROPELLER SHAFT MODELS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 8B-3
NOTICE
The following information can be used as a guide for determining vibration problems
on boats powered by inboard engines (MIE Engines). For installation, alignment and
repairs to shafts,struts,shaft logs and rudders, refer to boat manufacturer’s service
manual. If boat is equipped with V-Drive or a remote mounted V-Drive refer to boat
manufacturer’s service manual. For MIE engine installation and alignment, refer to
SECTION 2B.
Checks Made with Boat In Water
1. Disconnect propeller shaft coupling from transmission coupling.
2. Check fit of coupling to propeller shaft following instructions a or b:
a. Straight Bore Type:
(1.)Loosen set screws.
(2.)Try to move coupling by hand. The bore of the coupling should be a semi press
fit to shaft.
(3.)Check shaft for wear. If worn replacement of shaft may be necessary. If shaft is
not worn try another coupling.
b. Tapered Bore Type:
(1.)Check nut on shaft for tightness.
(2.)If nut was loose, remove coupling and check for damage to taper on shaft or in
coupling.
(3.)Replace worn parts.
(4.)Always make sure key is not sticking out of coupling.
(5.)Install coupling on shaft without the key.
(6.)Mark the shaft (behind the coupling); then, remove the coupling.
(7.)Now install the key and coupling. Make sure coupling still lines up with the mark.
This ensures that the key is not oversize and holding the tapers apart.
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