Subject: [EXTERNAL] Re: Stus-List Mechanical shaft seal options
I asked about maintenance on the PYI seal and was told to replace the bellows
every 5-7 years. I’ve found that it is best to replace the unit as by that
time the carbon seal is starting to score and requires replacement also
I asked about maintenance on the PYI seal and was told to replace the bellows
every 5-7 years. I’ve found that it is best to replace the unit as by that
time the carbon seal is starting to score and requires replacement also. The
bellows is the weak link in the system and since failure of th
1, 2019, at 5:31 PM, Marek Dziedzic via CnC-List <
>>>>> cnc-list@cnc-list.com> wrote:
>>>>>
>>>>> For a vented PYI, you need to make sure that the vent is high enough
>>>>> above the water level or you risk getting burps of water if you
>>>> cnc-list@cnc-list.com> wrote:
>>>>
>>>> For a vented PYI, you need to make sure that the vent is high enough
>>>> above the water level or you risk getting burps of water if you need to go
>>>> into high reverse (e.g. when dockin
rps of water if you need to go
>>> into high reverse (e.g. when docking or emergency stopping). Some use a
>>> bottle that collect these burps. I plumbed the vent into the sink drain. As
>>> long as you open the drain occasionally, no issues.
>>>
>>> Marek
nto the sink drain. As
>> long as you open the drain occasionally, no issues.
>>
>> Marek
>>
>> 1994 C270 Legato
>> Ottawa, ON
>>
>>
>> Original message
>> From: Ken Heaton via CnC-List
>> Date: 2019-12-11 10:57 (
these burps. I plumbed the vent into the sink drain. As
> long as you open the drain occasionally, no issues.
>
> Marek
>
> 1994 C270 Legato
> Ottawa, ON
>
>
> Original message
> From: Ken Heaton via CnC-List
> Date: 2019-12-11 10:57 (GMT-05:00)
>
Just a week ago a dock neighbor of ours had this exact twisting action
completely separate their bellows on a PYI seal. The only indication of a
problem from the helm was the fwap, fwap, fwap sound of the vent hose
whipping around and hitting the inside of the hull. Evidently the
stainless ring a
Josh, Shawn is correct. The 6 inch or so piece of hose on the original packing
gland. I would bet a high number of boats still have it in service. Mine was 20
years old when I replaced it and the outer rubber layer had cracks in it. There
isn’t a lot of water pressure on it but it gets a little
I think he means the short piece of hose that goes from the hull tube
flange to the seal carrier (just guessing at the names here). I suspect the
biggest risk is if the seal is too tight and binds, it can place too much
twist force on the hose, spinning it off or cracking it.
Another short piece o
nal message
> From: Ken Heaton via CnC-List
> Date: 2019-12-11 10:57 (GMT-05:00)
> To: cnc-list
> Cc: Ken Heaton
> Subject: Re: Stus-List Mechanical shaft seal options
>
> Is yours vented? The vent was added some years ago. With it you never need
> to burp the s
I'm not sure I understand what $2 hose you are talking about?
Josh
On Wed, Dec 11, 2019, 8:16 PM Len Mitchell via CnC-List <
cnc-list@cnc-list.com> wrote:
> How many boats still have the original $2 piece of rubber hose in service
> after 30 plus years? I bet the number is high. I haven’t heard
Interesting discussion. I have the old school packing, which seemed fine
after we bought her and launched in June. But I do see a fair amount of
salt crystals behind the engine, so I now wonder how much it drips. Access
is pretty tight, but I will try to have a look next time we're motoring for
a w
hose clamp for
the same purpose. Not as good but saves you about $30. I have the retention
collar.
Marek
From: CnC-List On Behalf Of WILLIAM WALKER via CnC-List
Sent: 11 December, 2019 19:32
To: cnc-list@cnc-list.com
Cc: WILLIAM WALKER
Subject: Re: Stus-List Mechanical shaft seal options
Josh
How many boats still have the original $2 piece of rubber hose in service after
30 plus years? I bet the number is high. I haven’t heard of anyone sinking due
to a shaft seal hose breakdown but why risk it for $2. Len
Sent from my mobile device.
___
Josh,
I don't have my PSS manual here in Ohio, but basically it is a two part ring
that clamps around the shaft and carries two o rings inside.
It also acts to prevent shaft from going out the back of the boat if the shaft
coupler let's go.
I have never actually used the replacement o rings,
I have a stuffing boxrepacked 10 years ago with a synthetic
packingsame as Chuckdry when shaft not spinning, drip when
motoring...have not tightened the packing since installing.
Can't even imagine when I have to ever replace the synthetic stuffing.
Rob Abbott
AZURA
C&C 32 - #277
FWIW, I think the dripless seals are overrated. I've had my boat 18 years with
the packing from the previous owner and I've never tightened the packing gland.
After a relaunch, a Yanmar engine mechanic cautioned me from tightening the
packing nut for three days after a launch. He said wait th
long as you
open the drain occasionally, no issues.
Marek
1994 C270 Legato
Ottawa, ON
Original message
From: Ken Heaton via CnC-List
Date: 2019-12-11 10:57 (GMT-05:00)
To: cnc-list
Cc: Ken Heaton
Subject: Re: Stus-List Mechanical shaft seal options
Is yours vented? The vent
Bill,
I'm curious how that works having a spare seal?
As far as I can tell, the primary failure mechanism for the PYI is the
bellows. It's hard to keep a spare of one of those.
The Lasdrop Gen 2 has a semi rigid hose instead of a bellows and terminates
with a SS plate which stays stationary. T
Josh,
The PYI seal also is capable of storing a spare seal on the shaft in front
of the seal. I have one.
Bill Walker
C & C 36
Evening Star
Pentwater, Michigan
On Wednesday, December 11, 2019 Josh Muckley via CnC-List
wrote:
Yep vented.
The PYI and Lasdrop seals rated the highest in a pract
Yep vented.
The PYI and Lasdrop seals rated the highest in a practical sailor review.
The lasdrop gen 2 has the ability to store a spare seal on the shaft and
the rated service life is 8 to 10 years.
I'm leaning towards the Lasdrop Gen 2 for my installation though I'm
tempted to keep the PYI. Th
Is yours vented? The vent was added some years ago. With it you never need
to burp the seal. We don't have the vent so occasionally we do have to
burp it. If I ever replace it I will put the same dripless, but with the
vent.
Ken H.
On Tue, 10 Dec 2019 at 13:48, Josh Muckley via CnC-List <
cnc-
you
don’t inspect it often enough (every few years??).
Marek
1994 #122 ”Legato”
Ottawa, ON
From: CnC-List On Behalf Of David Knecht via CnC-List
Sent: 10 December, 2019 14:49
To: CnC discussion list CnC
Cc: David Knecht
Subject: Re: Stus-List Mechanical shaft seal options
I second David’s
er
is better…
*/David F. Risch/*
*/(401) 419-4650/*
*From:*CnC-List <mailto:cnc-list-boun...@cnc-list.com>>*On Behalf Of*Josh Muckley via
CnC-List
*Sent:*Tuesday, December 10, 2019 12:47 PM
*To:*C&C List mailto:cnc-list@cnc-list.com>>
*Cc:*Josh Muckley mailto:muckl...@gmail.com
Simpler is better…
>
> David F. Risch
> (401) 419-4650
>
> From: CnC-List On Behalf Of Josh Muckley via
> CnC-List
> Sent: Tuesday, December 10, 2019 12:47 PM
> To: C&C List
> Cc: Josh Muckley
> Subject: Stus-List Mechanical shaft seal options
>
> Alr
Cc: Josh Muckley
Subject: Stus-List Mechanical shaft seal options
Alright folks,
I'm looking for thoughts on a replacement for my PYI dripless shaft seal. It
has worked fine and I'm not afraid to stick with it but I'm looking for
possible options or improvements.
I'
Alright folks,
I'm looking for thoughts on a replacement for my PYI dripless shaft seal.
It has worked fine and I'm not afraid to stick with it but I'm looking for
possible options or improvements.
I've heard of Tides Marine making one and Sailor Sam's sells 4 different
designs by the name Last D
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