It does look like a PYI PSS seal.
An unusual installation
- it seems that your boat only has a tiny length of shaft exposed between the stern tube (aka shaft log) and whatever the white metalwork at lower right of your picture.
What is the white painted metal at lower right of your pic: a transmission/gearbox?
The leaking all seems to be at the aft end, suggested by the stains on what I guess is the inside of your transom and the green colouring of what I guess is bronze.
I think your next step is to identify the source of the leak:
1. through the transom, perhaps via a crack or other fault; or
2. through the stern tube; or
3. at the point where the PSS bellows is clamped to the stern tube.
I read your post as you suspecting that the leak is at #3. That's possible, but your photo doesn't rule
out #1 or #2.
I do note that the PSS bellows is secured by hose clamps:
* two at the forward end (where the bellows is clamped to the PSS rotor); and
* one at the aft end (where the bellow is clamped to the stern tube - there may be a second hose clamp, but I can only see one). I cannot see the tensioning screw on that aft hose clamp.
I personally don't like common stainless steel
hose clamps of that screw-and-band style (the so-called Jubilee clip) unless they are doubled. And even then, I'm not keen on them. I prefer T-bolt clamps (e.g. https://www.whitworths.com.au/main_i...asp?item=44215
My first suggestion for your consideration (other folk will be along soon with completely different ideas) is to check and adjust that aft hose clamp on the PSS bellows. I'd suggest:
* first equipping yourself with a T-bolt clamp that would suit that diameter (it is likely the same diameter as the forward hose clamps; calipers would measure that for you).
* second, with a T-bolt clamp as a spare/replacement, then do your best to check and adjust the tension in that aft hose clamp. For all we know, that hose clamp may never have been tensioned properly. Or it may have already broken (typically, seawater plus mechanical stress leads to corrosion
of the metal band of the hose clamp right beside one of the slots cut for the tensioning screw to bite on). And that's the reason I think you should have a spare/replacement when you check that hose clamp - it might already need to be replaced or it might break when you try to tension it further.
As long as you have a healthy bilge pump
, you can do that with the boat in the water.
If you measure the hexagon of that most accessible tensioning screw on the second forward hose clamp, you can choose a socket wrench of the same size. And try to put that socket wrench on the head
of the tensioning screw of the aft hose clamp - it looks like you're going to need to do that blind, i.e. without being able to see the tensioning screw.
I'm concerned by that staining on the inside of your transom. It may be water that has run aft from the PSS. Or it may be water leaking through the stern tube or through the transom.
The transom is timber, right? You've checked the soundness of the timber with a probe? That would rule
If you can rule out leaking through the transom and leaking from the PSS bellow/stern tube connection, then I would suggest you focus on the likelihood that the stern tube might be leaking.
Note that you can see a video of recommended installation
procedure for a PSS at: PSS Shaft Seal