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Ring on rudder shaft

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Carlosailfan View Drop Down
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    Posted: 15 March 2018 at 07:36
Can someone tell me what the function is of the plastic ring, positioned around the rudder shaft, this prevents me to make a clear inspection of the shafts condition. Can i remove it ?
The ring is a bit movable, up and down and spins free round. I checked a few other Hanse yachts and there was no ring ???


Best regards
/C
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Gaia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gaia Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2018 at 17:53
I can't tell you the purpose, but I have the same question. I have tried to figure the purpose of the ring since 2013 without any success. If someone knows and svare the knowledge I too will be happy.

Kind regards
Hanse 385 sailor from norway.
The sailor from Lillesand, Norway
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gaia Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2018 at 17:58
Automatic norwegian spell checker creates trouble!!! Correction: svare means share.
The sailor from Lillesand, Norway
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 17 March 2018 at 08:09
Theory!!
On the underside of the Jefa bearing there is a plastic washer that clips in place. This is, presumably, to keep sand & grit, as well as marine growth, away from the bearing. On my boat this washer keeps coming adrift & dropping down. It could be (& this is only a guess) that the piece of tube is there to keep the washer in place


Edited by samuel - 17 March 2018 at 08:10
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Manyata View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Manyata Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2018 at 19:35
The rings are spacers.

Designed to stop the top of the rudder rubbing against the underside of the hull. 

If you look at the top of the rudder post (remove the inspection hatch to get to the AP drive unit) - there is a metal ring with 3 grubs screws - this stops the rudder dropping down vertically - and the white plastic spacer rings are designed to stop it riding up and rubbing against the hull.
 
You may be wondering how on earth the rudder (that heavy!) could move up? Jefa state the rudder on a 385 is 'buoyant' and will float. Hard to believe when the weight is some 52kg. But remarkably they are buoyant! So... Buoyant = it wants to rise in the water. 

The reality is - that if the bearings aren't cleaned - the rudder isn't going anywhere. It will not move 1mm !!! However if you clean the bearings it will have some movement. And cleaning the bearings has a remarkable affect on the weight of the helm. 

Note of caution - if you do drop the rudder to inspect for pitting on the stock (the only real way to check) - make sure you put the spacers back in the correct way round - one of them has a bevel - on one side - inside - the bevel allows the spacer to rub against the top of the rudder without rubbing away the sealant between the rudder post and top of the rudder.

I drop my rudder every year when hauling out as part of annual maintenance. Its a quick job - and worth doing (especially given the issues / care required around the antifouling at the top of the rudder). The bottom bearing gets really clogged (and I mean CLOGGED!) with sea gunk - and you will not believe the difference when you clean it out each year. Quite literally - the helm becomes lighter - spins with your little finger. And the AMPs drawn by the AP crashes through the floor.

Hope that helps.

Regards

Tim


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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2018 at 19:53
On  my boat the metal ring fits tight under the top bearing to stop the rudder floating up.
You are correct about it floating. Somewhere on this forum Johan Hackman posted a video of him trying to submerge his rudder in the water & it kept floating upwards.


Edited by samuel - 19 March 2018 at 19:55
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2018 at 07:00
I recall discussing this spacer many many years ago. I believe the conclusion was that the spacer is totally superflouos. 

On my tiller-steered 342 the rudder stock is locked vertically by the tiller head on top of the top bearing and the locking ring under the said bearing. As the rudder has a buoyancy it is only the locking ring under the top bearing that gets to work (and where you can detect any chafe). 

Here's the video Sam mentioned.

Johan



Edited by Johan Hackman - 20 March 2018 at 07:01
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2018 at 07:06
Below is a picture of the steering assembly on my boat. From left to right you see the tiller, the tiller head that the tiller is attached to, the top bearing, the locking ring and (at the end of the stock) the bottom bearing. There is no spacer involved but if you look closely you will see a delrin washer between the upper bearing and the locking ring.

I thought this could be interesting to share.

Johan


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Manyata Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2018 at 07:46
Hi Johan

If the 342 has a locking ring on the underside of the tiller head (to stop the rudder moving up) - there will be no spacers - if they were installed they would be superfluous - as there is no need for them on a 342. 

However, the 385 does not have a locking ring under the top bearing. So it does need spacers.

Regards

Tim

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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2018 at 07:58
Well, I don't know exactly how the steering assembly looks on a wheel-steered boat so you are probably right.

Johan
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