[Public-List] Cracked Stern Tube - Laugh or Cry?
Jonathan Bresler
262alberg30 at gmail.com
Sun Sep 23 03:33:37 PDT 2018
Wondering about replacing the original stern tube with a fiberglass one.
Might the steps be as follows? Anything missing? Any misunderstandings?
Advantages vs disadvantages of fiberglass over the original?
Install fiberglass stern tube
- Remove wad of material inside the boat around the stern tube
- Remove existing stern tube
- Remove propeller
- Remove existing cutlass bearing housing
- Buy replacement cutlass bearing
- Buy fiberglass stern tube with large enough internal diameter to house
the cutlass bearing and long enough to reach engine
- Enlarge hole in deadwood to take the new fiberglass stern tube
- Cut fiberglass stern tube to fit from engine to somewhat outside boat
- Insert spare cutlass bearing into one end of fiberglass stern tube
- Insert new cutlass bearing into the other end
- Drill holes in either side of the fiberglass stern tube for set screws
to hold the cutlass bearing in the deadwood
- Slide stern tube into place so that one end is nearly touching the
shaft coupling and the other protrudes out of the deadwood
- Align engine to stern tube and cutlass bearings
- Fiberglass the fiberglass stern tube into place
- Pull propeller shaft
- Cut fiberglass stern tube to allow space for the stuffing box
- Remove cutlass bearings from fiberglass stern tube
- Polysulfide and set screw cutlass bearing into fiberglass stern tube
- Install stuffing box onto fiberglass stern tube
- Install propeller shaft
- Check alignment and re-align if needed
- Done
-
- about half way down
http://www.lackeysailing.com/archived/hattiemae/june09/62209.htm
- bottom paragraphs of
http://www.lackeysailing.com/archived/hattiemae/june09/62309.htm
- first half of
http://www.lackeysailing.com/archived/hattiemae/june09/62409.htm
- middle of
http://www.lackeysailing.com/archived/hattiemae/june09/63009.htm
- lower portion of
http://www.lackeysailing.com/archived/hattiemae/july09/70209.htm
- top half of
http://www.lackeysailing.com/archived/hattiemae/july09/70309.htm
Jonathan
On Wed, Sep 19, 2018 at 1:15 PM, Gordon Laco via Public-List <
public-list at lists.alberg30.org> wrote:
> Understood… but it’s quite secure…
>
>
> Gordon Laco
> www.gordonlaco.com
>
>
>
>
> > On Sep 19, 2018, at 12:56 PM, Hernán Scarnichia <hernanscar at gmail.com>
> wrote:
> >
> > Gord,
> > yes that would have been another way to fix it.
> > probably easier.
> > at that time I didn't trust that a bolt threaded on epoxy could
> withstand any shaft vibration.
> >
> > On Tue, Sep 18, 2018 at 10:29 PM Gordon Laco via Public-List <
> public-list at lists.alberg30.org <mailto:public-list at lists.alberg30.org>>
> wrote:
> > Hello Hernan
> >
> > Those bolts are normally threaded in as you describe. They cannot be
> bolts through. You can restore their integrity if you need to by filling
> the loose bolts hole with thickened epoxy, then redrilling and tapping new
> threads.
> >
> > Gord
> > 426 Surprise
> >
> > Sent from my iPhone
> >
> > > On Sep 18, 2018, at 10:35 PM, George Dinwiddie via Public-List <
> public-list at lists.alberg30.org <mailto:public-list at lists.alberg30.org>>
> wrote:
> > >
> > > Hernán,
> > >
> > > How did a fiberglass shaft log change the bolts of the cutless bearing
> housing?
> > >
> > > - George
> > >
> > >> On 9/18/18 1:30 PM, Hernán Scarnichia via Public-List wrote:
> > >> The problem on my boat (#414) was that the two bolts holding the
> cutlass
> > >> bearing housing were not through bolted, just threaded into the
> fiberglass,
> > >> these were not lag bolts with a coarse thread either, just regular
> thread
> > >> bolts threaded straight to the fiberglass. The shaft vibrations
> loosened
> > >> them and one bolt was already gone when I hauled out.
> > >> I suppose that if I had realized earlier that the engine was
> misaligned,
> > >> and the shaft vibrating, it could all have been prevented.
> > >> Either way I did not like the fact that all that was keeping the
> water out
> > >> was those two bolts and a wad of caulk so I scrapped the whole thing
> and
> > >> installed a fiberglass shaft log.
> > >> On Mon, Sep 17, 2018 at 1:58 PM George Dinwiddie via Public-List <
> > >> public-list at lists.alberg30.org <mailto:public-list at lists.alberg30.org>>
> wrote:
> > >>> On 9/17/18 5:36 PM, Jonathan Bresler via Public-List wrote:
> > >>>> Remember hearing form various sources that cutlass bearings and the
> rest
> > >>>> are tricky
> > >>>> "cause the stern tube might turn or twist and break its bond to the
> > >>>> deadwood".
> > >>>> Seems that won't be a problem in this Triton given the amount of
> epoxy
> > >>>> applied.
> > >>>
> > >>> This was my fear, and the reason I pulled and rebedded the stern tube
> > >>> when I noticed that it had turned. The hose clamp screws were no
> longer
> > >>> pointed up where a screwdriver could reach them.
> > >>>
> > >>> It turned out that this is an unnecessary worry. The water is
> contained
> > >>> by the cutless bearing housing (and bolts), and the stuffing box. The
> > >>> caulking of the stern tube itself is not critical.
> > >>>
> > >>> - George
> > >>>
> > >>> --
> > >>> ------------------------------------------------------------
> ----------
> > >>> When I remember bygone days George
> Dinwiddie
> > >>> I think how evening follows morn;
> gdinwiddie at alberg30.org <mailto:gdinwiddie at alberg30.org>
> > >>> So many I loved were not yet dead,
> http://www.Alberg30.org <http://www.alberg30.org/>
> > >>> So many I love were not yet born. also
> see:
> > >>> 'The Middle' by Ogden Nash
> http://idiacomputing.com <http://idiacomputing.com/>
> > >>> ------------------------------------------------------------
> ----------
> > >>>
> > >>>
> > >>>
> > >>> _______________________________________________
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> > > --
> > > ----------------------------------------------------------------------
> > > When I remember bygone days George Dinwiddie
> > > I think how evening follows morn; gdinwiddie at alberg30.org
> <mailto:gdinwiddie at alberg30.org>
> > > So many I loved were not yet dead, http://www.Alberg30.org
> <http://www.alberg30.org/>
> > > So many I love were not yet born. also see:
> > > 'The Middle' by Ogden Nash http://idiacomputing.com
> <http://idiacomputing.com/>
> > > ----------------------------------------------------------------------
> > >
> > >
> > >
> > > _______________________________________________
> > > These businesses support your Association:
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--
Jonathan M Bresler
S/V Constance Alberg 30 #262
Annapolis/Eastport MD
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