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Knocked my stern tube loose -- how screwed am I?


 

No idea why you are getting a 404 on the google album -- I opened the link in incognito mode and it worked fine. I've uploaded the images here as well,



I guess my concern with just adding some fiberglass inside the hull is two-fold and stems from not understanding how the stern tube was held in place to start with.?

?1) If it was originally bonded to the hull along the whole length of the tube -- will bonding it just at the end really be enough?

I have one hypothesis that it was originally only bonded on the inside with a bit of fiberglass at the end, so doing it that way again would be fine. Though I have no way to test my hypothesis about how it was originally done.

I did try giving the stern tube some good wacks with a rubber mallet from the inside and I was not able to move it back into position. In many respects that is good news. Hopefully that means that once I do get it back into place it won't take much to get it to stay there. Additionally, since there is no wobble or play, I shouldn't have to worry about alignment issues when I add the fiberglass.

?2) My second concern is that if I do not have any sealant on the side that is in the water, that water will be able to creep along the outside of the bronze tube and cause trouble. In theory, the fiberglass on the inside of the boat would keep that water from getting into the boat -- but will it cause issues for the bronze tube and fiberglass to have that water between them?

Looking closer at the stern tube, it seems the bronze tube is inside another tube, and the outer tube is glassed into the deadwood. So, I guess the question is -- was that bronze tube pressed into the outer tube, or was it bonded to the outer tube.

One thought is that perhaps the fit between the bronze stern tube and the outer tube is so tight that water can't creep in. Or perhaps it can, but doesn't matter -- after all the inside of the stern tube is filled with seawater anyway.

A different thought is that perhaps during construction there was a large hole that the bronze tube was suspended in so they could fine tune the alignment, and then they filled the gap up with some sort of adhesive sealant. If I somehow managed to break the stern tube free of that adhesive -- then a little fiberglass on the inside might not be enough.

Alternatively, perhaps they thought that people would eventually want to replace their stern tubes, and so they made the somewhat removable. I've seen some stern tube replacement documents where they had to cut the stern tube out,



But, perhaps it is a less aggressive procedure on a T27.

So, I guess I am unsure how to fix things because I am unclear how it worked in the first place.

- jeremy




On Sat, Aug 24, 2019 at 10:38 PM Scott Walters scott@... [T27Owners] <T27Owners@...> wrote:
?

Got a 404 not found on the Google album and Yahoo claims to have the
photo too but I can never just log in... it's always some kind of a
gauntlet.

But in general, "On option would be to hammer it back into place, and
then add some fiberglass and epoxy on the inside. But that sound
sketchy."... IMO, glassing stuff solid is the least sketchy option.
Sikaflex ismore designed for being a gasket between parts with
different thermal expansion coefficients than to build structure. If
you use it as a gasket between parts and there's force or pressure,
then something else should be holding the parts together. So IMO just
make it a permanent part of hull and do fiberglass layout. Obviously
just make sure it's straight and stays straight until the structure
starts to form.

When I went to top off the diesel (repowered at some point before my
tenure), I discovered the injector return line had melted on the
exhaust manifold, and that made a small mess. And there's an exhaust
leak. Inboards are needy. The sculling oar looks like a really good
idea.

-scott

On 8/24/19, Jeremy Shaw jeremy@... [T27Owners]
<T27Owners@...> wrote:
> I just want to clarify and add one more thing.
>
> In the title I said I knocked the bronze tube loose. But that is an
> overstatement. It definitely move 1/4" or so -- but if I grab it and try to
> move it, it does not wiggle or move in or out at all. So it is still in
> there pretty darn tight.
>
> I also added a photo to the album of the tube inside the boat. The
> fiberglass around the tube there used to actually be laminated to the tube,
> but has delaminated. Perhaps friction is primarily what holds the tube in
> place and the little bit of fiberglass on the inside prevents water that
> makes it around the outside of the tube from leaking into the bilge?
>
> Updated album:
>
> - jeremy
>
> On Sat, Aug 24, 2019 at 6:17 PM Jeremy Shaw <jeremy@...> wrote:
>
>> Ahoy,
>>
>> I was installing a new cutlass bearing with a home made puller
>> (all-thread, washers, nuts), and my wrench was not long enough to give me
>> enough torque to get the cutlass bearing in all the way. So I decided to
>> tighten it as much as possible and then hit the end of the rod with a
>> hammer. Then I could tightening another 1/2 turn or so.
>>
>> The idea is that because of the tension from the rod, I wouldn't have to
>> hammer as hard. That worked fine until I dislodged the stern tube. I
>> guess
>> I should have just waited and got some longer wrenches? Or maybe it
>> should
>> not have been that hard in the first place?
>>
>> So the question is -- what now? From what I can tell there is a
>> fiberglass
>> tube that has a 3' or so long bronze tube in it, and the cutlass goes
>> into
>> aft end of the bronze tube.
>>
>> The bronze tube is now displaced about 1/4". Though it is still in there
>> pretty tight. I've attached photos of the current situation.
>>
>> So, what now?
>>
>> I am guessing that even if I tapped the bronze tube back into place it
>> would leak or perhaps shift around later.
>>
>> On option would be to hammer it back into place, and then add some
>> fiberglass and epoxy on the inside. But that sound sketchy. Maybe the
>> whole
>> thing needs to be completely removed, cleaned up, and then reinstalled
>> with Sikaflex 291 or 292 or something? Or maybe it only needs a little
>> bit
>> of sealant on the last inch of the tube?
>>
>> I'm trying to get an idea of the scope of the project and then decide if
>> I
>> should do it or get the boatyard to do it.
>>
>> From what I can tell, stern tubes do have to be replaced now and then and
>> are (often) not permanently affixed to the boat. And, perhaps if mine
>> came
>> loose 'this easily' it was time to reseal it anyway? I'd like to pretend
>> that I accidentally discovered some maintenance that needed to be done
>> anyway, though I suspect that is not the case.
>>
>> Worst case, I guess I'll just have to glass over the hole, take out the
>> engine, and get a big sculling oar like the guy on How To Sail Oceans.
>>
>> Thanks!
>>
>> - jeremy
>>
>>
>>
>>
>