I have been dealing with exactly that issue since I bought my boat 7 years ago. 
It hasn't been an issue and as a backup I have a zinc anode on the shaft about 
3/8" from the packing nut just in case it lets loose. I'm sure the keyway is 
wearing out as a result but I haven't noticed any increase in play. It's just 
on my mind as one of those " not quite right" things

Brent
27-5
Lake Winnipeg 

Sent from my iPhone

> On Jun 5, 2015, at 1:16 PM, Brad Crawford via CnC-List 
> <[email protected]> wrote:
> 
> I recently had my transmission out for a rebuild and upon putting it back in 
> and the boat back together discovered that the propeller shaft coupling is a 
> little loose on the shaft, maybe 1/8” of rotational movement on the shaft, 
> like possibly the keyway is worn?.  Have tried tightening the set screws, 
> which secures the coupling but eventually they work loose and again there is 
> movement of the coupling on the shaft.  It’s been recommended that I have the 
> boat hauled,  the coupling removed,  the shaft pulled out and provided the 
> shaft is ok, a new coupling fitted and faced to the shaft, and then 
> reinstalled for a final alignment. 
>  
> My question to the group is has anyone else been running around with a loose 
> coupling and is this something I should be immediately concerned about?
>  
> Thanks,
>  
> Brad Crawford
> CnC 36
> Seattle
>  
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