[Public-List] stern tube question

David Fay davidfay999 at gmail.com
Fri Feb 1 07:01:12 PST 2019


Don,

Thank you so much for your comments. It's not what I wanted to hear but you've opened my mind to new possibilities.

My initial thought was that there couldn't have been much force applied to the shaft because the wrap didn't stop the engine. Plus I have that flexible coupling, which is supposed to avoid damage in just this kind of situation -- the weak link as you call it. But we'll see. The next step will be to see if the shaft wobbles when I rotate it.

David
Blue Teal #284

> On Feb 1, 2019, at 9:39 AM, Don Campbell via Public-List <public-list at lists.alberg30.org> wrote:
> 
> David:
>   You have probably bent the drive shaft with the dockline as I suspect that is the weakest part of your drivetrain.. If you recall, Kris Coward said he had a bent driveshaft and I have had one as well. The bend in my shaft was about 0.005" and was small enough that the machine shop I took things to managed to work that back to straight with a lathe and some sideways pressure. Stainless is very malleable, and bends easily. I am surprised though that you only have a 7/8" shaft for a diesel. They are usually a full 1" because of the extra torque developed by diesels. It the shaft did not bend, then the coupler probably gave because of that torque or, if that did not fail, a motor mount has bent. You should have that diesel on flex mounts. Whatever has been the resistance with the dockline, it will have been the torque developed by your motor that will have caused the weakest link to fail.
> Don
> 
> -----Original Message----- From: David Fay via Public-List
> Sent: Thursday, January 31, 2019 9:21 PM
> To: Alberg 30 Public List -- open to all
> Cc: David Fay
> Subject: Re: [Public-List] stern tube question
> 
> Michael,
> 
> That's possible of course, but this is not some ancient clunker of an engine but rather a new Beta Marine diesel installed just five years ago by a highly competent boat restorer (Tim Lackey). I would be very surprised if a rope wrap could twist the engine around on its engine mounts. But it's certainly something I will have to look into.
> 
> David
> Blue Teal #284
> 
> 
> 
>> On Jan 31, 2019, at 8:30 PM, Michael Grosh via Public-List <public-list at lists.alberg30.org> wrote:
>> 
>> It sounds like the line wrap may have pulled the engine out of alignment.
> 
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