Hi Brian,
This pitting is not unusual for stainless steel that has spent time
in a low oxygen environment. The water in there is stagnate, oxygen
depletes, a galvanic cell develops and viola. The process is the
pits, so to speak.
The remedy is pretty much as you did, clean up the shaft best as
possible. To my eye that amount of pitting is not going to affect reliability.
To avoid future pitting don't leave the shaft in one position during
long periods of immersion. Run the engine a little while in gear or
at least turn the shaft by hand a bit during your regular checks when
you're not using the boat.
Cheers, Russ
Sweet 35 mk-1
At 02:15 PM 04/03/2016, you wrote:
I cleaned up the prop shaft. Then took 600 grit sandpaper then 400
grit sandpaper to it. There is some pitting on the shaft that rides
in the bearing. Attached is a link to my blog that has a pic. Is
this an issue? Do I need to replace the shaft or have these pits filled?
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