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Replace rubber diaphragm seal ring

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Bertil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bertil Quote  Post ReplyReply Direct Link To This Post Topic: Replace rubber diaphragm seal ring
    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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote grumpydatagit Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2017 at 12:42
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2017 at 15:12
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.

Sea-U is a 370e #532 located SW Norway
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2017 at 21:43
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.


Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout & shallow keel, normally based in Scotland
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Sea-U View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2017 at 09:00
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...
Sea-U is a 370e #532 located SW Norway
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cptgood View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cptgood Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2017 at 12:24
Hi, how do you remove the water alarm sensor in order to check it?
Just pull or twist and pull?
Hanse320 - Hull#100/08
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 20 October 2017 at 17:33
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.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout & shallow keel, normally based in Scotland
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Bertil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bertil Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2017 at 17:21
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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