Doing some research
on the internet
it looks like the problem I have with my SD20 sail drive prop shaft is not unheard of! Putting the boat gently into reverse after a 4 hour motor
(no wind) last week, the propeller
came off and has gone forever!
As if this wasn't bad enough having hauled the boat onto a cradle
it shows that about half of the externally and internally threaded stub has sheared off where a pre-drilled cross hole is. I understand Yanmar
did away with the hole drilling on replacement shafts.
Has anyone succeeded in getting any compensation/ replacement from Yanmar
as it seems to be a production failure as obviously weak and vulnerable to shearing.
May I ask one more thing? Has anyone repaired a shaft like this instead of replacing it? In the UK they cost well over $1000 and she`s an old boat but with a replacement Yanmar engine
and sail drive 9 years ago , one that`s done very ]few hours since.
Thanks for your thoughts, Robin.