A suggestion - if you haven't already done it:

At the coupling that attaches the prop shaft to the transmission.

After tightening the set screw(s) tightly, back them out and pull the shaft 
out of the coupling.

Centerpunch the center of the marks made by the set screw points on the 
shaft.

Drill into the shaft about an eighth inch, starting with a pilot drill and 
ending with a drill about the same diameter as the set screw.

Re-install the shaft using square head set screws with safety wire holes 
drilled in the heads and safety wire them securely in place.


I once saw a large, beautiful, and very expensive wooden yacht in the Virgin 
Islands with its bow smashed in from hitting a concrete pier because its 
prop shaft pulled out of its coupling when put into reverse.  It was a sad 
sight and so easily prevented.



Norm
S/V Bandersnatch
Lying Julington Creek FL
30 23.8N 081 25.7W




There will be a few more pictures to come on the next one, but we also did a
lot of work on our drive train.  These are of the installation of the
checked and shortened shaft and the return to a standard-type packing gland
(which keeps the water out of the boat while still allowing the shaft to
turn).

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