[Public-List] Shaft Seal / Stuffing box

Mike Lehman mlehman at gmail.com
Mon Mar 18 07:40:43 PDT 2019 

Recently an Alberg 30 had to have the stern tube replaced. To solve the
problem of dissimilar sizes between the stern tube and the stuffing box, a
machine shop (Kastel Brothers in St. Michael's MD) was employed to
fabricated the new stern tube. They took the standard size tubing and
brazed a bronze thru hull fitting to the inboard end, then turned the thru
hull on a lathe to match the diameter of the stuffing box. It was an
elegant job and solved the problem of the stuffing box hose fitting
properly to each end. I have picture if anyone wants to see them.

On Mon, Mar 18, 2019 at 9:53 AM Andrew Johns via Public-List <
public-list at lists.alberg30.org> wrote:

> David,
> Thanks for the video.
>
> Most stuffing boxes use a heavy wall hose that is the same diameter on both
> ends.
>
> I have not been able to find a hose or bellows that is 1-3/8" on one end
> and 1-3/4" that would also be suitable for below the waterline use.  I
> found some silicone couplings made for automotive turbochargers. It doesn't
> appear heavy enough to counteract any torque from friction within the
> stuffing box.
>
>
> On Fri, Mar 15, 2019 at 2:00 PM David Fay <davidfay999 at gmail.com> wrote:
>
> > Andrew,
> >
> > I'm confused by your note. In your description of the mismatch in size
> > between the stuffing box and the stern tube, you fail to mention the
> > bellows (which some call the hose) that connects the rear of the stuffing
> > box with the front of the stern tube. It's the bellows that must
> accomodate
> > the mismatch.
> >
> > Have you looked for a bellows that is 1-3/8" on one end and 1-3/4" (the
> > presumed outside diameter of the rear of the stuffing box) on the other?
> > For example, the nitrile bellows shown with the dripless stuffing box in
> > the link you provide is clearly a reducing design so they must be out
> there
> > somewhere. Even if you can't find an exact match to the O.D. of stuffing
> > box and stern tube, wouldn't compressing the bellows with hose clamps
> work?
> >
> > David
> > Blue Teal #284
> >
> > > On Mar 15, 2019, at 1:30 PM, Andrew Johns via Public-List <
> > public-list at lists.alberg30.org> wrote:
> > >
> > > I figured I would post a followup to the stuffing box question.. that
> > > turned into a discussion on deck hatches :P
> > >
> > > The 7/8" prop shaft with a 1-3/8" stern tube seems to be a odd
> > combination.
> > >
> > > It appears no conventional stuffing boxes are available with our shaft
> > > size and stern tube combination.  I called Buck Algonquin to inquire if
> > the
> > > 1- 3/4  model could be modified to accommodate a 1-3/8 tube, but there
> is
> > > not enough material in the casting.  Some sort of 1-3/4 to 1-3/8
> reducer
> > > would need to be fabricated and they did not like the idea of sleaving
> > the
> > > 1-7/4 id hose with another to reduce it down to 1-3/8 od.
> > >
> > > The only option it seems is the PSS drip less shaft seal. Which uses a
> > > carbon flange pushing against a stainless ring (like my existing
> lasdrop
> > > seal).  PN 02-078-144 which goes for around $225 online.The
> applications
> > > engineer said due to our cutlass bearing in the stern tube it may
> require
> > > water injection to provide adequate cooling.  The general consensus
> > online
> > > is that folks either hate this thing and it will sink your boat with
> out
> > > warning while you sleep or it is the best thing ever invented.
> > >
> > > https://www.shaftseal.com/pss-type-a-seal.html
> > >
> > > Looks like I will be ordering one of these in the next few weeks while
> I
> > > wait for the ice to melt.
> > >
> > > Thanks for your feedback everyone!
> > >
> > > Regards,
> > > Andrew
> > > ECOLA #104
> > >
> > >
> > >
> > > On Fri, Mar 8, 2019 at 11:47 AM Mike Lehman via Public-List <
> > > public-list at lists.alberg30.org> wrote:
> > >
> > >> Check with Hamilton Marine in Maine...they have lots of hatches, may
> for
> > >> commercial use, so they are very strong and durable.
> > >>
> > >> www.hamiltonmarine.com
> > >>
> > >>
> > >> On Fri, Mar 8, 2019 at 7:48 AM Jeffrey Randall via Public-List <
> > >> public-list at lists.alberg30.org> wrote:
> > >>
> > >>> Thanks,
> > >>>
> > >>> Jeff
> > >>>
> > >>> On Friday, March 8, 2019, Wes Gardner via Public-List <
> > >>> public-list at lists.alberg30.org> wrote:
> > >>>
> > >>>> Hi Jeff,
> > >>>>
> > >>>> Mine is made by Tempress. Google Tempress Access Hatch and that will
> > >> put
> > >>>> you on the right track. Mine is about 13x22. Yes, it’s plastic and
> > >>> probably
> > >>>> is NOT suitable for offshore work. You CAN walk/stand directly on
> it.
> > I
> > >>>> change mine out every five years or so as it might get brittle.
> > Someone
> > >>>> makes an aluminum that WILL be suitable for offshore work, can’t
> > >> remember
> > >>>> who ...maybe Bomar?
> > >>>>
> > >>>> Wes
> > >>>>
> > >>>> Sent from my iPad
> > >>>>
> > >>>>> On Mar 7, 2019, at 6:17 PM, Jeffrey Randall via Public-List <
> > >>>> public-list at lists.alberg30.org> wrote:
> > >>>>>
> > >>>>> This is for Wes.  Where did you get the floor hatch for your
> > >> Alberg.  I
> > >>>>> have decided after going God knows how long without updating my
> > >>> stuffing
> > >>>>> box. that this is the spring.... However as always that means two
> > >>>> projects
> > >>>>> at least.  The Floor hatch and the stuffing box.  Any info size
> type
> > >>> etc
> > >>>>> would be great.
> > >>>>>
> > >>>>> Jeff Randall
> > >>>>> Yankee Star.  296
> > >>>>>
> > >>>>> On Thu, Mar 7, 2019 at 2:55 PM Wes Gardner via Public-List <
> > >>>>> public-list at lists.alberg30.org> wrote:
> > >>>>>
> > >>>>>> Hi All,
> > >>>>>>
> > >>>>>> I guess I'm a traditionalist...I'll stick with the good old tried
> > >> and
> > >>>> true
> > >>>>>> stuffing box and deal with a few drips, the main
> reason....everyone
> > >>>>>> understands these things.  I suppose the down side might be in the
> > >>>> limited
> > >>>>>> access to the stuffing box.  My boat has a large access port in
> the
> > >>>> cockpit
> > >>>>>> sole so I can readily and easily adjust/maintain my stuffing box.
> > >>> I've
> > >>>>>> also repacked many, many from my years in the yards so I'm not
> > >>>> intimidated
> > >>>>>> when repacking either in the water or on the hard.  A well
> > >> maintained
> > >>>>>> stuffing box can last virtually forever I suppose.  Also there's
> no
> > >>>> need to
> > >>>>>> REALLY tighten the lock nut....these things are bronze (soft
> metal).
> > >>>>>>
> > >>>>>> Wes
> > >>>>>>
> > >>>>>> On Thu, Mar 7, 2019 at 10:40 AM George Dinwiddie via Public-List <
> > >>>>>> public-list at lists.alberg30.org> wrote:
> > >>>>>>
> > >>>>>>> Andrew,
> > >>>>>>>
> > >>>>>>> My thoughts are on
> > >>>>>>>
> http://alberg30.org/maintenance/MechanicalPropulsion/DriplessSeal/
> > >>>>>>>
> > >>>>>>> Are you sure that teflon packing is dripless?
> > >>>>>>>
> > >>>>>>> - George
> > >>>>>>>
> > >>>>>>>> On 3/7/19 10:24 AM, Andrew Johns via Public-List wrote:
> > >>>>>>>> On #104 we have an old lasdrop dripless shaft seal that is no
> > >> longer
> > >>>>>>>> supported by the manufacturer and due for replacement.
> > >>>>>>>>
> > >>>>>>>> What are the groups thoughts on shaft seals/ stuffing boxes?
> > >>>>>>>>
> > >>>>>>>> I'm leaning towards a conventional stuffing box with teflon
> > >> dripless
> > >>>>>>>> packing.
> > >>>>>>>>
> > >>>>>>>> Thanks,
> > >>>>>>>> Andrew
> > >>>>>>>> ECOLA #104
> > >>>>>>>> Colchester ,VT
> > >>>>>>>
> > >>>>>>> --
> > >>>>>>> ------------------------------------------------------------
> > >>>> ----------
> > >>>>>>>  When I remember bygone days                         George
> > >>> Dinwiddie
> > >>>>>>>  I think how evening follows morn;
> > >>> gdinwiddie at alberg30.org
> > >>>>>>>  So many I loved were not yet dead,
> > >>> http://www.Alberg30.org
> > >>>>>>>  So many I love were not yet born.                          also
> > >>> see:
> > >>>>>>>               'The Middle' by Ogden Nash
> > >>> http://idiacomputing.com
> > >>>>>>> ------------------------------------------------------------
> > >>>> ----------
> > >>>>>>>
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> _______________________________________________
> > >>>>>>> These businesses support your Association:
> > >>>>>>> http://www.alberg30.org/store/A30supporters.html
> > >>>>>>> Please support them.
> > >>>>>>> _______________________________________________
> > >>>>>>> Public-List mailing list
> > >>>>>>> Public-List at lists.alberg30.org
> > >>>>>>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>>>>>>
> > >>>>>> _______________________________________________
> > >>>>>> These businesses support your Association:
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> > >>>>>> Please support them.
> > >>>>>> _______________________________________________
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> > >>>>>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>>>>>
> > >>>>>
> > >>>>>
> > >>>>> --
> > >>>>> Sincerely,
> > >>>>>
> > >>>>>
> > >>>>> Jeff Randall
> > >>>>> JCMedical
> > >>>>> 603-498-5574
> > >>>>> _______________________________________________
> > >>>>> These businesses support your Association:
> > >>>>> http://www.alberg30.org/store/A30supporters.html
> > >>>>> Please support them.
> > >>>>> _______________________________________________
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> > >>>> _______________________________________________
> > >>>> These businesses support your Association:
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> > >>>> Please support them.
> > >>>> _______________________________________________
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> > >>>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>>>
> > >>>
> > >>>
> > >>> --
> > >>> Sincerely,
> > >>>
> > >>>
> > >>> Jeff Randall
> > >>> JCMedical
> > >>> 603-498-5574
> > >>> _______________________________________________
> > >>> These businesses support your Association:
> > >>> http://www.alberg30.org/store/A30supporters.html
> > >>> Please support them.
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> > >>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>>
> > >>
> > >>
> > >> --
> > >> Mike Lehman
> > >> ~~~_/)_/)~~_/)~~~
> > >> _______________________________________________
> > >> These businesses support your Association:
> > >> http://www.alberg30.org/store/A30supporters.html
> > >> Please support them.
> > >> _______________________________________________
> > >> Public-List mailing list
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> > >> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>
> > > _______________________________________________
> > > These businesses support your Association:
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> > > Please support them.
> > > _______________________________________________
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> >
> >
> _______________________________________________
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> Please support them.
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>


-- 
Mike Lehman
~~~_/)_/)~~_/)~~~

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