The requisite compression is that which eliminates leakage.  If your engine
mounts are soft, the prop thrust can push the engine forward and spread the
bellows and collar causing a leak...While in forward.  The conventional
wisdom is that the shaft should have dimples drilled for the grub screws.
I don't like doing that since everytime I adjust the collar I put new drill
dimples in the shaft.

McMaster Carr has SS shaft collars which are relatively easy to install.
These are used and recommended a a redundant holding device.  They could
also be used to hold the collar until the grub screws were set.

As I recall PYI also suggests using a sharpie to mark the decompressed and
compressed collar position.  They also suggest that the bellows will need
replaced every 5 years.  I'm on my 6th season and I have no idea how many
the PO had had.  There is no indication of the rubber degrading, no cracks
and still resilient.  I've never had to readjust the compression and I
don't release it during the winter... Then again I don't haul out but once
a year for only 1 week.  I'll soon be considering the dripless shaft seal
by sailorsams.com

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD



On Jun 3, 2017 10:33 PM, "Eric Frank via CnC-List" <cnc-list@cnc-list.com>
wrote:

> For winterizing the PYI shaft seal on Cat's Paw, it was recommended that I
> loosen the SS collar on the prop shaft so the rubber bellows is not
> compressed.  I'm now trying to compress the bellows again before launching
> - PYI recommends compressing it about 3/4 inch.  It's difficult to compress
> the bellows and tighten the set screws at the same time, given the limited
> access to that area (under bilge and exhaust hoses).  Any suggestions for
> holding the bellows compressed temporarily while I tighten the set screws?
>
> Eric Frank
> Cat’s Paw, C&C 35 MkII
> Mattapoisett, MA
>
>
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