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Post by normane on Apr 20, 2014 9:12:56 GMT
Rather than hijack another thread I thought it best to start a new one. My 1998 Jeanneau 45.2 had covered a lot of miles in charter use before I bought her. The gooseneck is made of soft alloy castings with 14mm diameter stainless pins. All the holes in the alloy parts were badly worn with oval holes up to 2mm oversize. I bushed the holes in the gooseneck casting with bushes turned from bronze bar. The holes being opened up using a series of expanding reamers and the bushes pressed in with a smear of a Loctite bearing retainer as additional security. I used a single long bush for the vertical hole. As the holes in the mast fitting were also worn I bushed them after reaming them in situ. Finally all bushes were fitted with 6mm grease nipples. Creaking is now a thing of the past.
I wrote the project as an article which was published in Practical Boat Owner (August 2012)
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Post by Don Reaves on Apr 20, 2014 10:30:58 GMT
Have you seen any signs of electrolysis? Of course, the problem of not being able to remove them due to corrosion would not be an issue here.
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Post by ianqv on Apr 20, 2014 12:39:52 GMT
Sounds like a Great mod! do you have any pictures of this?
Best Regards
Ian
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Post by normane on Apr 20, 2014 17:04:32 GMT
Have you seen any signs of electrolysis? Of course, the problem of not being able to remove them due to corrosion would not be an issue here. They are not immersed in water so electrolysis is not an issue. The only thing that I will address is that I used ordinary plated steel grease nipples, and will replace them with stainless ones as I have now obtained some. |
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Post by normane on Apr 20, 2014 17:09:03 GMT
Sounds like a Great mod! do you have any pictures of this? Best Regards Ian I have pictures on Photobucket. Here goes with my first attempt at posting a few.
The first one shows the wear. The one below shows the tools used to ream the castings and all the bushes assembled onto the gooseneck casting
This shot shows the final result
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Post by normane on Apr 20, 2014 17:20:21 GMT
Well, I made the first picture show, but the others only posted links. What did I do wrong?
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Post by MalcolmP on Apr 20, 2014 17:36:34 GMT
Well, I made the first picture show, but the others only posted links. What did I do wrong? You nearly got it right, easiest way is to always use the "insert Image" icon. I have now put them in, thanks for sharing - my 39i boom squeaks a lot, despite grease so I may need this fix |
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Post by normane on Apr 20, 2014 18:05:32 GMT
It may not be entirely fair to criticise the manufacturers, because my boat had over well 40,000 nautical miles on the log, but I do find the use of un-bushed soft aluminium castings in such a vital part of the boat to be poor engineering practice.
I forgot to say before that I found that the top and bottom faces of the gooseneck casting had worn well out of square, and trued them up with the reamed bore using a milling machine. Extra washers took up the vertical play on assembly. |
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Post by ianqv on Apr 20, 2014 22:29:19 GMT
Great Mod.... thanks for posting the pics.
It's certainly one I would do the next time I have to replace my gooseneck.
Best Regards
Ian
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jc
Junior Member
Posts: 11
Jeanneau Model: SO DS 50
Yacht Name: Nereus
Home Port: Jersey
Country: GB
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Post by jc on May 30, 2014 7:34:31 GMT
I have a similar gooseneck on my SO 50DS. In our first season we suffered from a catastrophic failure of the aluminium casting. Jeanneau tried to suggest it was our fault! On close inspection of the fractured pieces, it was clear that the casting was full of voids (air gaps). These voids were only visible after the failure, or by very careful inspection of the inside surface of the 2 bolts holes.
We fitted an exact replacement but it also creaks and squeaks despite greasing. But after our first experience I am always worried the casting may fail.
Has anyone else experienced this failure?
Is cast aluminium suitable for this crucial component or should it be made of stainless steel?
Would the reaming and inserting of grease nipple described above, further weaken the casting?
If the component is worn, should it be replaced?
Has anyone found a SS replacement part that fits?
I suggest owners should very closely inspect their castings, especially the inside surface of the bolt holes if they have their boom dismantled.
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Post by alenka on May 30, 2014 20:03:19 GMT
When I had my SO 43 DS surveyed last year the report also picked up on wear in the Goose Neck. It is not so obvious in this picture but the alloy had started to wear down. As per the recommendation nylon washers have now been inserted to cut down on the metal to metal friction. A fairly simple and inexpensive job which hopefully will save money in the long run.  Attachment Deleted |
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Post by aussieodyssey on Jul 17, 2014 16:26:53 GMT
Had mine break in a sudden jibe on my 2000 Jeanneau 54.2. Brought a new one from Sparcraft they are now a stainless steel part .
Regards
Greg
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bedfordman
New Member
Posts: 3 
Country: United Kingdom
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Post by bedfordman on Jul 27, 2014 16:04:35 GMT
Had similar problem with our 45.2 --- goose neck broke in unplanned gibe. (Driver error!). Had friend machine new one from solid. No more problems but do get squeak from time to time. The grease nipple idea is excellent. Peter
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Post by normane on Oct 21, 2015 10:22:10 GMT
As a follow up to this, I too broke the casting in an unplanned gybe, so all my work on it only lasted a year or so. I have now replaced it with one machined from solid aircraft grade aluminium bar stock instead of a casting. I salvaged all the bronze bearings from the broken casting and pressed them into place. In answer to JC's query above I do not consider that a stainless steel part, running on stainless steel shafts is a good solution at all. My own solution, using good quality aluminium bar stock, and bronze bushes is far superior.  i.imgur.com/j1ofCem.jpg |
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