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Arcadia 
Admiral 
Joined: 27 November 2017 Location: Sag Harbor, USA Status: Online Points: 1112 |
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 Posted: 27 December 2025 at 14:59 |
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Hi Piero. Looks like this. Just aft of the transmission. Provides a flexible connection for the engine and also a thrust bearing for the shaft. The forward force of the shaft acts rigidly and directly to the hull and NOT to the engine as in conventional installations. 
Edited by Arcadia - 27 December 2025 at 20:50 |
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Arcadia
Admiral
Joined: 27 November 2017 Location: Sag Harbor, USA Status: Online Points: 1112 |
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Posted: 27 December 2025 at 15:05 |
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The thrust bearing is on the far left in the photo and bolts directly to the hull. The flexible coupling are the two rubber rings on the right which transmit the rotation from the transmission. Take a look next time you’re there. Check for cracks in the rubber. Check for rust, wear or movement where the shaft enters the thrust bearing.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Pzucchel
Rear Admiral 
Joined: 13 March 2020 Location: floating Status: Offline Points: 659 |
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Posted: 27 December 2025 at 15:06 |
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thank you leon! i admit i have seen it and "cleaned it"...but what is much more difficult to see is the pss. Is the pss between the device you show and the hull, right? hidden by the plastic box just above, that i guess is the water container required to lubrificate it? i find it surprising that of all the devices installed on the boat there is no mention neither in the manual nor in the documents provided by hanse digitally... i discover now the 5 years maintenance requirement suggested by the manufacturer...
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Hanse588#55
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Arcadia
Admiral
Joined: 27 November 2017 Location: Sag Harbor, USA Status: Online Points: 1112 |
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Posted: 27 December 2025 at 16:59 |
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Yes. Access and maintenance on both of those items, the PSS and the Centa coupling, is very difficult. So far I’ve been lucky ! I’m thinking removal of the large plastic water muffler is the first step for access.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Pzucchel
Rear Admiral
Joined: 13 March 2020 Location: floating Status: Offline Points: 659 |
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Posted: 18 March 2026 at 14:38 |
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just one more comment: i realised that - while i can access quite easily the coupling - i can't even SEE the PSS!! i can barely touch it with a finger...admittedly I have the generator installed, that entered by " cutting" the boat below the companionway - so i can't even remove the plastic water muffler. it is literally " a boat in a bottle "If i want to maintain the pss i am obliged in cutting the companionway, extract the generator, extract the muffler... ouff, this is bad design and bad planning on my side. i wish that the manual had any reference to it, i could have anticipated this problem...
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Hanse588#55
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Arcadia
Admiral
Joined: 27 November 2017 Location: Sag Harbor, USA Status: Online Points: 1112 |
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Posted: 18 March 2026 at 21:00 |
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I wonder if there is a way to the PSS through one of the aft cabins. In the space below the berths there may be a wood panel that can be cut out.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Pzucchel
Rear Admiral
Joined: 13 March 2020 Location: floating Status: Offline Points: 659 |
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Posted: 18 March 2026 at 21:31 |
this is a smart idea . in the 588 there are no holes in the wood - but it's probably easier to remove the panels than trying to enter from the engine room side ....i will try it, thanks Leon for the idea. |
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Hanse588#55
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Wayne's World
Admiral
Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1434 |
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Posted: 19 March 2026 at 00:43 |
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I haven't looked in detail yet but I think I will need to cut an access from below the bunk through the inboard wall to hopefully access the PSS seal. I have booked a haulout at the end of April so we will soon find out how easy or difficult it is to get access to this area.
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Wayne W
Cruising, currently in the Pacific until the end of 2026. |
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Pzucchel
Rear Admiral
Joined: 13 March 2020 Location: floating Status: Offline Points: 659 |
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Posted: 19 March 2026 at 12:23 |
i completely agree. An opening in the wood - but as low as possible. what is the expected maintenance? admittedly, i am still thinking to what "replace the bellow every 6 years" means: if the bellow is coaxial to the propeller axis - does it mean to it remove the axis??? at least, we're not submarines...but all the rest is nearly unachievable in this very moment for me... The PSS (Packless Sealing System) Shaft Seal (“PSS”) you are preparing to install is a
through-hull fitting that protects against water from entering the boat where the shaft
enters the hull, when properly installed and maintained. Make sure that you or your
designated installer is a qualified professional, knowledgeable and skilled to install the PSS
correctly, and that you have all the required tools and additional equipment on hand before
beginning installation.
• If removing the engine transmission for repair or if launching the boat without a
transmission installed, then the shaft must be kept in place with a device that will secure
the shaft with the PSS bellow in its normal “compressed mode”.
• Install the PSS ONLY with the boat out of the water.
• DO NOT USE oil, grease (petroleum products) or silicone products at any time during the
installation. Use soap and water to lubricate the o-rings of the rotor when sliding it down
the shaft.
• Clean the seal area of your boat so you do not contaminate the seal surface with dirt, oil
or other foreign matter. Do not damage or scratch the face of the carbon or the face of the
stainless steel rotor during unpacking or while handling or installing the PSS.
• There should be a total of four (4) set screws in the two holes of the rotor (2 sets screws
in each hole). If you must move the stainless steel rotor, make sure to remove the top set
screws in order to access the bottom two set screws.
• Do not re-use the supplied cupped pointed set screws. If multiple tightening has flattened
the cupped-point set screw, replace the affected screw with a new one.
• There should be a total of four (4) hose clamps securing the bellows ends. These clamps
should be replaced if they show any sign of corrosion.
• Do not slide the aft bellow cuff too far down over the stern tube. The leading edge of the
stern tube could cause damage to the inner ribs of the bellow and improperly limit the bellow
movement and travel.
• If fitting a vent line (boats under 12 knots), do not run a loop at the top end of the hose as
this could promote a siphon.
• If the boat sits idle for a long period of time (generally 3 months or more), it is necessary to
move the carbon face back to allow a small amount of water to enter the boat.
• As with any hose under the waterline, the PSS bellows must be inspected on a regular basis
(i.e., no less than at least every 6 months under most circumstances) and checked for any
signs of deterioration (cracks, splits, tears, brittleness, or other signs). Upon any sign of
deterioration the bellow must be replaced. As preventive maintenance the bellow should
be replaced no less than every 6 years on the Type A Seal, and 8 to 10 years on the PSS PRO
Seals, regardless of its apparent condition.
• Do not allow any petroleum-based liquid or corrosive material to come in contact with
the PSS. Take care to ensure that this does not occur, for example, when performing any
general maintenance, or winterizing the engine.
• The shaft should be near centered and run parallel to the shaft log.
• Do not use an ozone generator (e.g., air cleaner) in or around your boat. The extra ozone
will speed up the deterioration of any rubber product, including the PSS bellow.
• The bellows will need more frequent inspection and replacement in an environment
where non-sealed batteries emit sulfuric acid vapors. Sulfuric acid vapors will accelerate
deterioration of any rubber materials including the PSS bellows.
• Do not use sealant to fit the bellow to the stern tube or the hose to hose barb.
• Do not run dry. It is imperative that the mating faces of the stainless steel rotor and carbon
stator receive adequate water flow to cool and lubricate the seal faces at all times.
• Do not use the PSS SEAL on a submarine vehicle
Edited by Pzucchel - 19 March 2026 at 16:20 |
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Hanse588#55
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Wayne's World
Admiral
Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1434 |
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Posted: 20 March 2026 at 00:15 |
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Piero,
It is my understanding that you need to at a minimum disconnect the shaft from the coupling and move it aft so the PSS seal can slide off the bow end of the shaft and once replaced then slide back along the shaft until it can clamp onto the log (where the shaft comes out of the hull). Once the seal is on, you would reconnect the shaft to the coupling. The other option is to completely remove the shaft, but this would, I think not be necessary just to replace the PSS seal. In my case I will probably replace the shaft, thrust bearing and carrier, cutlass bearing and the PSS seal all at once so the old shaft, PSS seal and cutlass bearing will all need to be removed. Fun and games to look forward to. It is an issue that the access is very poor even for routine maintenance let alone replacement. Very poor design.
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Wayne W
Cruising, currently in the Pacific until the end of 2026. |
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Arcadia wrote: