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Replace rubber diaphragm seal ring |
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Bertil
Sub Lieutenant Joined: 11 October 2006 Location: Sweden Status: Offline Points: 7 |
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Posted: 08 October 2017 at 22:27 |
Hello! Has anyone replaced the diaphragm on the Yanmar SD20 saildrive? My Hanse 315 has been sailing for 10 seasons so I have decided to replace. A big problem (to start with!) is the difficulties to reach the saildrive from inside. I can see that there are some screws in the interior parts arount the engine that I can take away, but also a lot of silicone. Shall I cut it away? And there is also some wooden lists but without screws. Does anybody know how to go on? Bertil /Hanse 315 |
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grumpydatagit
Captain Joined: 22 August 2015 Location: Lymington Status: Offline Points: 225 |
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Hi Bertil
The Yanmar SD20 has two seals with a sensor to detect water between the inner seal and the outer seal. The perceived wisdom is wait until the alarm goes off first before changing the seals as this is a major task. From what I can gather this involves removing the engine and splitting the upper and lower parts of the geabox before you can get to the seals. Most people budget for over a £1000 to do it! |
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Sea-U
Commadore Joined: 14 September 2012 Location: Norway Status: Offline Points: 459 |
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I relaced on a Volvo after 15 years. It looked as new. Others say the same after 20 years.
I now have a Yanmar with SD20 and I will not change before 15 years, probably more. |
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Sea-U is a 370e #532 located SW Norway
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Martin&Rene
Vice Admiral Joined: 06 December 2009 Location: United Kingdom Status: Offline Points: 833 |
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That's funny! Last night I started to post a new topic on exactly the same question, but I deleted it half way through accidentally.
On my Hanse 341, with a Yanmar 2GM the seal is now 13 yrs old. The boat is in cold seawater (max 14 deg C) for 8 months of the year and out of the water for 4-5 months each winter. I do check the water alarm occasionally. Is there anybody out there who has changed the seal and if so, what form was the damage, if any? What conditions does the yacht sail in as this may affect the degradation rate? I am wondering whether you can see anything using one of the cheap borescopes that you can now buy from DIY or car repair shops. |
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Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Sea-U
Commadore Joined: 14 September 2012 Location: Norway Status: Offline Points: 459 |
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My boat was in the sea the hole year. All but two winters.
It might matter if the the boat is on land every winter, I don't know. Has anybody ever heard of a seal has gone ??? I have not after over 30 years...
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Sea-U is a 370e #532 located SW Norway
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cptgood
Commadore Joined: 26 August 2016 Location: Tuscany - Italy Status: Offline Points: 409 |
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Hi, how do you remove the water alarm sensor in order to check it?
Just pull or twist and pull? |
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Hanse320 - Hull#127/08 - Wheel - ST headsail - Yanmar 3YM30 - SD20
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Martin&Rene
Vice Admiral Joined: 06 December 2009 Location: United Kingdom Status: Offline Points: 833 |
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It is screwed in, with quite a few turns. If it has not been removed before then the problem is that as you unscrew it you have to wind up the wires quite a few times.
When I replace mine, I leave some turns in the wire there, so first of all I unwind the turns and then put some back in. This makes it easier to get out next time.
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Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Bertil
Sub Lieutenant Joined: 11 October 2006 Location: Sweden Status: Offline Points: 7 |
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Hello again! Returning to the original question about the difficulties to reach the saildrive from inside, I can now confirm that the interior parts are glued together. That means you have to work with long sharp knives to pull away parts. Then the engine was moved forward about 10 cm and tilted forward a bit. Finally the saildrive could be lifted up in the cabin and is now transported for change of seal ring. /Bertil |
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Captain Cook
Admiral Joined: 23 May 2006 Location: Denmark Status: Offline Points: 1009 |
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This is how it looks:
This diaphragm was replaced when 8 years old, it looks and feels like new. I paid a professional to change it, price €1100, all included. The mechanic pays like 50% for the spare parts compared to the price I have to pay, so I did not try to do it myself. The technician used 7 hours, moving the engine back, dismantling the saildrive, lifting it into the boat, and then refitting everything. Edited by Captain Cook - 14 April 2018 at 19:09 |
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Freya H400 #27 (2006), 40HP 3JH4E, 2-cabin, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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StavrosNZ
Rear Admiral Joined: 24 October 2014 Location: New Zealand Status: Offline Points: 556 |
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yep just confirms what i have always seen and felt, little need to replace these unless there has been damage or something other than normal use.
revenue gathering exercise for Yanmar and Volvo.
test and keep the water sensor working, inform insurance company maybe pay small premium more and keep sailing. |
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Stephen
2010 H400 #691, Auckland, New Zealand |
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