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 > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! >
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