Posted by Brian Guptil (sailordude@…>)
PSS shaft seals:
I burp them
every couple of months and at launch and after operating in very rough
conditions. Air bubbles can accumulate in the upper stern tube and the
interface between the composite block and the stainless disk can dry out.
The only ones
that don’t need burping (I think) are those with hoses attached to the (composite)
block on the end of the bellows. The problem with them is that the block
is longer and on some Freedoms, there isn’t enough room for the added
length between the stern tube and the coupling. On planning hulls, that
hose must be connected to a source of water, otherwise just high enough in the
hull so that water will make it to the seal and not overflow at any angle of
heal, into the boat.
Brian
Guptil sailordude@…
-----Original Message-----
From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of Alan Kusinitz
Sent: Tuesday, April 18, 2006 2:10 PM
To: freedomyachts2003@yahoogroups.com
Subject: RE: [freedomyachts2003] PSS shaft
seal
My yard burps all PSS
shaft seals (supposedly) just as a general practice. I would think many yards
do if you have them service the engine on launching but certainly
wouldn’t count on it.
Alan F-33
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From:
freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of tom
Sent: Tuesday, April 18, 2006 1:54
PM
To: freedomyachts2003@yahoogroups.com
Subject: [freedomyachts2003] PSS
shaft seal
Hello
Dave,
I’ve had a PSS seal installed since 98 and have
never burped it. Your
reference was the first time I’d heard of
it. It’s possible that the
yard (Sven’s and Nelsons) have been doing it
without my knowing.
Did you burp yours every time you hauled?
I called PSS and talked to Dan Schalk. He
said that my vintage seal
might need burping (the newer ones don’t
evidently), but it was
dependent on the boat. A boat with a long
prop shaft at a steep angle
relative to horizontal would be more of a problem
than a short shaft
with a shallow angle (relative to
horizontal). He mentioned that a
seal that needed burping would most likely emit a
high pitched sound,
akin to a bearing going bad. I don’t have
the symptom on Ketch 22.
— In freedomyachts2003@yahoogroups.com,
“Dave_Benjamin”
<dave_benjamin@…> wrote:
I think the newer PYI dripless shaft seals
don’t need to be “burped”
after going back in the water. FWIW some of
the local surveyors in
the Pacific Northwest where the PYI is
headquartered, are not big
fans of the system. We had one on our 39 and
it never gave us a
problem. We knew it needed to be burped so we
never had any damage
from running it dry after haulout.
— In freedomyachts2003@yahoogroups.com,
“anchoring9”
<anchoring9@> wrote:
Warning! I have a 1987 Freedom 36.
The dripless shaft seal that
it came with started to
leak. The PYI staff said that it
now leaks because the air was
not bled out when the boat
was launched. This may have
happened several times since I did
not know about this
necessity for six years. I
don’t know if the previous owner
failed to do this either.
Question: Do you have to remove the
rudder in order to remove the
shaft? Or, can the
new PYI dripless shaft seal and cutless
bearings be installed
without removing the rudder?
\