I don’t have a 33, so I cannot comment on how it would fit. But I installed a PYI dripless shaft seal on my boat 4 years ago and I am happy with it.
As Nathan did, I replaced everything (shaft seal, shaft, coupling and the cutless bearing). You can do just the seal, but if you have to remove the shaft in the first place, it makes sense to replace it with new. You won’t need to do it for the next 7-15 years. The standard procedure is to replace the bellows every 6-7 years, but from what I hear and see, very few people do that. I would suggest inspecting the bellows every so often and replace it when you think is the right time. I think that that period was shortened a few years back (legal issues?). The pro version has a longer maintenance period. I would strongly recommend an extra $30 for the retention ring.. You put it right behind the SS ring that forms the mechanical seal. This is the thing that would keep your shaft in the boat if, by any chance, the coupling fails. The breathing hose (the 3/8 one mentioned below) needs to go above the water line. In my experience, it would spill water, sooner or later. If you need to move forward and reverse abruptly and with some revs, the water will go up that hose and eventually would spill. One option is to install a bottle that would capture the spilled water (and empty it on occasion). I tried it for a while, but it wasn’t a good solution. In my case, I plumbed the breather hose into the kitchen sink’s drain. This way, any water that wants to spill out goes back into the lake and the bellows can still breathe through the sink. The installation is quite involving ( a lot of parts to be matched and replaced), but generally straight forward. Overall, I have a completely dry bilge. I did not use the bilge pump at all this season. NB. There is yet another company making a similar product - Lasdrop. Good luck Marek 1994 C270 ”Legato” Ottawa, ON From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Nathan Post via CnC-List Sent: Thursday, October 18, 2018 21:27 To: cnc-list@cnc-list.com Cc: Nathan Post <nathan8...@gmail.com> Subject: Re: Stus-List C&C 33-2: PYI shaft seal Not sure regarding the 33-2 but I was able to just fit a PYI shaft seal in my 34. It took perhaps an inch or so more space along the shaft than the original stuffing box. Once installed and assembled with the right pressure on the bellows I have an inch or so between the PYI and the end of the coupling. I installed it this summer after buying the boat because the stuffing box was in rough shape so that needed replacing anyway - it was brutal getting the coupling off of the shaft (I had to cut it off with a grinder and then have a new one fit and faced to the shaft - which apparently is standard practice although I didn’t know that when I started the project). So it isn’t a small job in the end. Also, there was just nearly enough room so I had to assemble the PYI loosely with the shaft just poking through it, then put the new coupling in place and tap the shaft into coupling (one person outside tapping, the other inside keeping it aligned and watching for the dimple when it is slide in far enough). I got a split coupling (it is actually only partially split) which helps a lot but it still take hammering on it to get it through. Definitely recommend the split coupling though and I am hopeful that I might have more luck pressing it off next time it comes to that. The final task was running a 3/8” hose from the PYI up 2 ft above water line. You want to keep it as centered as possible so I went to the and then up between the cockpit and the transom inside the hull and secured it to one of the air vents with a few zip ties. Doesn’t leak or get hot so I am happy with it overall. But it was a big project and the bellows are supposed to be replaced ever 5-6 years I think. I would definitely take a look if there is an option that doesn’t require disassembly of the shaft. Nathan Post S/V Wisper C&C 34 Malden, MA On Oct 18, 2018, at 9:14 PM, Josh Muckley via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: I have a Max-Prop, a R&D coupling isolator, R&D engine mounts, and I have a PYI shaft seal - all the same company. I generally like the engineering and customer support and like the shaft seal fine. That being said, I would suggest taking a look at the Sailor Sam's shaft seal. As the vendor described to me at the boat show you can evidently replace the "packing" (carbon rings) with it installed and in the water. Some of the models do not require the tension of a rubber bellows but rather have a physical metal spring that maintains pressure. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Oct 18, 2018, 8:49 PM Adrian Humphreys via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Any 33-2 owners with the PYI dripless shaft seal? Will it fit? We're looking at overhauling the packing gland and considering replacing it altogether. Thanks, Adrian Humphreys _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.paypal.me%2Fstumurray&data=02%7C01%7C%7Cc6d382068cf14a6fe39808d635623c03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636755093355975792&sdata=QhqtY7xhxXyjklI1EhyztQRcbo5RgC7tbdvqR4iglJs%3D&reserved=0> _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.paypal.me%2Fstumurray&data=02%7C01%7C%7Cc6d382068cf14a6fe39808d635623c03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636755093355975792&sdata=QhqtY7xhxXyjklI1EhyztQRcbo5RgC7tbdvqR4iglJs%3D&reserved=0>
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
