[Public-List] Dripless stuffing box (was: Standpipe exhaust)
Rachel
penokee at cheqnet.net
Wed Dec 16 09:20:31 PST 2009
John,
I'm not sure what brand of dripless seal you are using, but here is
what I understand:
The ones I'm familiar with do want you to have a flow of cooling water
(a small plastic PTH connector is inserted and you run a hose to it),
but that is usually not required, flow wise, for a displacement speed
boat. On the other hand, some people still do elect to install the
cooling water hose in a displacement boat, because this eliminates the
need to burp them upon launch.
Not that burping is a problem, but you have to be sure that the yard
does it.
Rachel
PS: I can't remember which of the two popular brands this is, but one
of them requires a really good shaft surface for it to seal to;
whereas the other brand uses two mating discs to seal, and thus is
more tolerant of slight imperfections in the shaft.
PPS: Don't take this as an endorsement at all. Personally, I vastly
prefer the traditional stuffing box, with some nice gore packing.
On Dec 16, 2009, at 10:17 AM, George Dinwiddie wrote:
> John, I'm not a fan of the mechanical dripless stuffing boxes. And
> I think any modification to add a valve would only let the
> manufacturer off the hook in case of a failure. Besides, can't you
> just pull on the accordian fold to drain the bearing?
>
> - George
>
> mahseer at kos.net wrote:
>> When I opened up my exhaust, except the section that is above the
>> water
>> line that had some soot the bronze pipe was as good as the day it was
>> made. No corosion or pitting, I am in fresh water not salt. the
>> weak link
>> seems to be the braise between the copper pipe and the bronze lower
>> washer.
>> This winter I have to remove the engine to replace the cockpit drain
>> gate valves, while doing this I might replace the stuffing box with a
>> dripless one. Since they need a flow of water to cool them I am
>> thinking about useing the exhaust drain valve to do this this way
>> there
>> is no standing water in the pipe when the boat is not used. Any
>> thoughs
>> on the dripless bearing and the cooling idea.
>> John Boor
>> MAHSEER #380
>>> If the joint leaks, it'll dump into the bilge, not the cylinder.
>>> The
>>> center pipe is continuous. Also, the old ones had a drain valve to
>>> drain the water out for the winter.
>>>
>>> - George
>>>
>>> Peter Amos wrote:
>>>> I had one of these on my previous boat.It was an incredibly heavy
>>>> weight on the exhaust manifold,it leaked from a weld,out of sight
>>>> ,and corroded an engine mount.I saw a diagram in one of Calders
>>>> maintenance books and it looked to me that it always had water in
>>>> it.If an interior weld leaks I think it would dump water into the
>>>> cylinders
>>>>
>>>> Pete #166
>>>>
>>>>> Date: Tue, 15 Dec 2009 09:50:00 -0800
>>>>> From: gwyn at beluga.phys.uvic.ca
>>>>> To: public-list at lists.alberg30.org
>>>>> Subject: [Public-List] Standpipe exhaust
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> I just had mine refurbished. It was leaking and something inside
>>>>> was rattling. I didn't actually see the pipe disassembled, but
>>>>> the guy made some drawings which I've reproduced and put
>>>>> on the web at:
>>>>> http://astrowww.phys.uvic.ca/~gwyn/pers/sailing/standpipe.gif
>>>>> The drawing is a bit crude, and not to scale, but it gives
>>>>> you the idea.
>>>>>
>>>>> The rattle was caused by the deflector cap coming loose,
>>>>> which is what is described in the last paragraph of:
>>>>> http://www.alberg30.org/maintenance/MechanicalPropulsion/Exhaust/standpipe.html
>>>>> It was resoldered in place. It wasn't possible to get the top
>>>>> cap off by melting the original solder, so it was cut off and
>>>>> then resoldered with silver solder.
>>>>>
>>>>> The guy who did this (Townside Auto in Victoria BC) said the
>>>>> pipe was copper, not bronze. He figured that to make a new one
>>>>> would require 200$ worth of copper parts plus 3 hours shop time.
>>>>>
>>>>> Stephen Gwyn
>>>>> #495 Quasar
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------
>>>>> Stephen Gwyn | Tel: 1-250-363-3136
>>>>> Dept. of Physics & Astronomy | Fax: 1-250-363-0045
>>>>> Univ. of Victoria | Cell: 1-250-885-6969
>>>>> PO Box 3055 | E-mail: gwyn at uvastro.phys.uvic.ca
>>>>> Victoria, BC V8W 3P6 | http://orca.phys.uvic.ca/~gwyn
>>>>> ------------------------------------------------------------------
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>>> --
>>>
>>> ----------------------------------------------------------------------
>>> 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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>> _______________________________________________
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>
> --
> ----------------------------------------------------------------------
> 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.
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