[Public-List] Shaft Seal / Stuffing box
David Fay
davidfay999 at gmail.com
Fri Mar 15 11:00:41 PDT 2019
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
>>>>>>> ------------------------------------------------------------
>>>> ----------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>> --
>>>>> Sincerely,
>>>>>
>>>>>
>>>>> Jeff Randall
>>>>> JCMedical
>>>>> 603-498-5574
>>>>> _______________________________________________
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>>>
>>>
>>> --
>>> Sincerely,
>>>
>>>
>>> Jeff Randall
>>> JCMedical
>>> 603-498-5574
>>> _______________________________________________
>>> These businesses support your Association:
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>>
>>
>> --
>> Mike Lehman
>> ~~~_/)_/)~~_/)~~~
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