Needing help with a question

[Ted Riley]

I have a 1965 mercury 110 9.8 hp that I am restoring. Looking at the drive shaft, should there be an O ring at the bottom of the spline on the drive shaft?

 

[The Force power]

Yes, it's there to keep water out & prevent rust built-up on the splines

http://www.boatinfo.no/lib/mercury/manuals/mercury_1965-1989_2-40.html#/0

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