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Rudder post corrosion |
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CAMBRIA 
Sub Lieutenant 
Joined: 26 May 2013 Location: USA Status: Offline Points: 3 |
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 Topic: Rudder post corrosionPosted: 25 July 2015 at 21:18 |
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I have a 2012 Hanse 415. We recently discovered that the aluminium Jefa rudder post had started corroding at the point where the post meets the fiberglass rudder. The corrosion is all around the post and about 4-6mm deep and about 35 mm high. We now need a new Jefa rudder.
We initially believed it must have been caused by electrolysis with copper-based anti-fouling paint as the boat is fully bonded by Hanse and has a hull zinc close to the sail drive, although there is no copper paint on any metal parts of the rudder or rudder stock.
However, my experienced boatyard now believes its caused by the Jefa steering gear being electrically bonded and creating a 'dead short' - and that Hanse should never have done this when the boat was delivered and Hanse should be responsible for repairs. Reading the Jefa online instructions they do indeed say that the rudder shaft must be electrically disconnect from the rest of the yacht. Has anyone any knowledge of this problem- and is your Jefa steering gear bonded to the rest of the boat or not ? |
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Cam
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Rod
Commander 
Joined: 11 March 2013 Location: Dubai/Gocek Status: Offline Points: 124 |
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Posted: 26 July 2015 at 06:14 |
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Andy, I have a 2012 415 which has been in the water for 2 years, here in Dubai, and would be interested if you have any photos of the damage. I dived for a hull inspection last weekend and apart from finding the anodes on the bow thruster 90 percent gone, the rudder stock looks OK. Bow thruster is a sidewinder and apparently you can change the anodes underwater which is going to be interesting as they are held on by one hex bolt which looks pretty well seized.
I plan to dive again next weekend to clean and inspect the sail drive and prop, and attack the hex bolt so will be interested to see your findings. Plan to pull the boat out in the winter, although that may come forward as the ac sea water cooling pump inlet valve stuck in the closed position (after cleaning the inlet filter - which plugs up every two to three weeks) . As it was 49C outside you can imagine what it was like in the boat trying to work on the that!
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Hanse 415 - "Ti"
Gocek, Turkey. |
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CAMBRIA
Sub Lieutenant
Joined: 26 May 2013 Location: USA Status: Offline Points: 3 |
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Posted: 26 July 2015 at 16:55 |
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Rod- the corrosion was very hard to see before we dropped the rudder out of the boat. I would check the bottom of the rudder stock carefully. I believe its solid aluminium but even a bit of corrosion suggested to us that there is a some other problem going on. Keep any copper-based antifouling well clear of the rudder stock and the top of the rudder itself and use a non-metallic protective primer and paint in this area. Make sure your zinc hull anode is good.
I am curious to know if your Jefa steering gear at the top of the rudder shaft is bonded ? Does it have a green/ yellow cable attached ? |
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Cam
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Rod
Commander
Joined: 11 March 2013 Location: Dubai/Gocek Status: Offline Points: 124 |
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Posted: 26 July 2015 at 17:26 |
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Cam, thanks for the info. I will add this to the haul out list , however will go have another look at the weekend and also check if there is a bonding cable.
Rod |
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Hanse 415 - "Ti"
Gocek, Turkey. |
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415 Singapore
Vice Admiral 
Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935 |
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Posted: 11 August 2015 at 14:59 |
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Hi we had reason to check the rudder stock last weekend as the whipping I had added to the wheels to show the dead ahead position no longer lined up, turned out the the stock had actually slipped round about five degrees as the head bolts weren't particularly tight!
However I did notice that our stock is bonded. I would be very interested to know if that is right or wrong All the best Paul - Night Train |
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Paul - Night Train - 415 #136
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Ilkhanse
Captain 
Joined: 27 November 2011 Location: USA Status: Offline Points: 228 |
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Posted: 12 August 2015 at 02:32 |
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Yikes!! I dont remember exactly, but I think my rudder stock is bonded to the boat. I will check next time I am down. My boat has plastic rings around the rudder stock in between the top of the rudder and the hull - does anyone else have this?. I think this is to keep any copper based paint from touching the rudder stock. The downside is that it makes it almost impossible to inspect the rudder stock.
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alidal
Captain
Joined: 30 September 2010 Location: Norway Status: Offline Points: 297 |
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Posted: 12 August 2015 at 06:51 |
Jefa strongly recommend to remove it. Here is what Jefa said: (In Danish)  Med hensyn til jording af din ror stamme vil vi på det kraftigste anbefale dig at fjerne den. Den øger kun risikoen for tæring i ror stammen.
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Hanse 400#655
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415 Singapore
Vice Admiral
Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935 |
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Posted: 19 August 2015 at 02:11 |
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Hi, I asked our agent to check with Hanse, because I didn't really want to remove the earth cable without their agreement. Below is what he got back from them. (The picture he refers to didn't come through on their email)
Paul - Night Train
We have been
informed about a case of electrolytic corrosion on a rudder shank. It cannot be
excluded, that the corrosion is an isolated case. The risk of corrosion
concerns yachts built since September 2010. The yachts in question have an
Volvo engine. Additionally they do not have a zinc anode on the hull, but have
a grounding cable at the rudder shank as shown by the picture below. Raoul
Bajorat Head of
Development Department |
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Paul - Night Train - 415 #136
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Rubato
Admiral 
Joined: 12 July 2006 Location: Canada Status: Offline Points: 1806 |
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Posted: 19 August 2015 at 17:28 |
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Interesting.
One would think that Hanse would be proactive about these sorts of things and send out a service bulletin to dealers/owners....
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Steve
Hanse 400e, #168 |
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415 Singapore
Vice Admiral
Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935 |
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Posted: 24 August 2015 at 02:02 |
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Hi I am getting really confused about this, the reply I got from Hanse gives advise for boats with Volvo engines and no hull anodes. I checked this weekend and we have a large rectangular hull anode, so I have asked our agent to check with Hanse again.
Paul _ Night Train
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Paul - Night Train - 415 #136
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415 Singapore wrote: