T&T: Subject: Packless Shaft Seal

[Paul Brannon]

We need to make sure we are talking about the same dripless seals.  I have 
the PSS seals and they have worked well.  I have never heard of a 
catastrophic failure of the bellows from seizure.  I have seen a 
catastrophic failure of the bellows on the Tides Marine seal.  That being 
said, I do know of a number of people that have them and have had absolutely 
no problems.  The PSS seal has a vent that is used in low rpm mode in order 
to keep the bellows from trapping air when the boat is launched.  It can 
also use pressurized water from the engine to this same port and this is 
recommended in higher rpm use.  Since I have a displacement hull, I don't 
use pressurized water.  The only issues I have had is with having the 
bellows slightly undercompressed and I would get leakage on one if we had to 
reverse under power.  It seems that the prop wash would introduce pressure 
through the stern tube and on some occasions leak at the seal or out of the 
vent tube.  Since mine are easy to get to in the engine room I have not had 
a problem checking and adjusting them if needed.

Paul
----- Original Message ----- 
From: "Jeffrey Siegel" <jeff at activecaptain.com>
To: "George & Emilie Rankin" <gerankin at msn.com>
Cc: <trawlers-and-trawlering at lists.samurai.com>
Sent: Sunday, June 21, 2009 8:48 AM
Subject: Re: T&T: Subject: Packless Shaft Seal


> > Yes, it was tightened, moved < inch aft and it still
> > leaked underway (maybe more than before).  Several
> > looked at it and said it was overcompressed.  We
> > also measured it and based on the PSS length table
> > it was now overcompressed.
>
> Have you spoken to an engineer at PYI?
>
>
> ====================================
> Jeffrey Siegel
> M/V aCappella
> DeFever 53RPH
> W1ACA/WDB4350
> Castine, Maine
>
> www.activecaptain.com
> The Interactive Cruising Guidebook
>
> Our cruising blog:
> http://takingpaws.blogspot.com
>
>
> ..
> _______________________________________________
> http://lists.samurai.com/mailman/listinfo/trawlers-and-trawlering
>
> To unsubscribe or modify your subscription options (get password, change 
> email address, etc) go to: 
> http://lists.samurai.com/mailman/options/trawlers-and-trawlering
>
> Trawlers & Trawlering and T&T are trademarks of Water World
> Productions. Unauthorized use is prohibited.