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Johan Hackman 
Admiral of the Fleet 
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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 Posted: 29 April 2024 at 09:30 |
I will try to find out which of the two it is! I wonder how you check for water in the seal other than relying on the alarm? I have found what connector to disconnect in order to get rid of the very annoying sound alarm. So problem fixed in that sense!  All of the accounts of people having changed the seal have told that the seal looked like new so I have not considered changing mine even if my boat now is almost 19 years old. I obviously have to take a better look at that. Johan |
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Martin&Rene
Vice Admiral 
Joined: 06 December 2009 Location: United Kingdom Status: Offline Points: 967 |
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Posted: 29 April 2024 at 17:10 |
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Johann
I have Yanmar 2GM20F with an SD20 saildrive. The sensor for water between the 2 seals is on the starboard side of the saildrive, just near the seacock. The normal recommendation is that you can test it by unscrewing it and putting it in a glass of water. I do this every now and then and ignore the recommendation in my manual that you should replace the seals every 2 years! I replaced the seals on my yacht after 14 years, but my boat is out of the water each winter. Having removed the sensor, and hopefully no water coming out, you can push a piece of tissue down the hole to see if there is in fact any water between the 2 seals. The water sensor only gives a very small signal so there is an amplifier, probably a small box, on the port side of the engine. Thus there are lots of connections for you to check on a white and red wire. The water sensor is in the negative side of the alarm circuit, so the other connection will be a blue negative wire. I am on my yacht now and, if required, I can take my manuals home and email the relevant diagrams. Martin |
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Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Johan Hackman
Admiral of the Fleet
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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Posted: 30 April 2024 at 07:12 |
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Martin, this is very useful.
What you are saying is that removing the sensor (that I have located but yet not unscrewed) and making sure that it is dry would stop the alarm from sounding? And then putting it in a glass of water would start the alarm again? That would be a very easy test to see if the sensor it faulty that I will will undertake as soon as I get back to my boat. Johan |
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Johan Hackman
Admiral of the Fleet
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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Posted: 03 May 2024 at 06:52 |
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Here I was thinking I would get demoted from being Admiral of the Fleet by asking a question about the engine, revealing my total ignorance.
But this forum shines and I got replies that made me solve the problem in minutes. I am very thankful for this. I removed the saildrive sensor, put tissue in its hole and discovered that it did not get wet, then used the tissue to clean the sensor. After having put the sensor back I started the engine - and the alarm was gone! I will use this experience as a wake-up call to learn more about my engine and consider a future change of the seal. (Or seals, as I think there are two of them?) Johan Edited by Johan Hackman - 03 May 2024 at 06:53 |
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415 Singapore
Vice Admiral
Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935 |
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Posted: 03 May 2024 at 07:12 |
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Well done! Glad you fixed it
Happy sailing
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Paul - Night Train - 415 #136
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Matros
Captain 
Joined: 27 July 2009 Status: Offline Points: 332 |
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Posted: 07 May 2024 at 12:53 |
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Hi Johan,
Long time... I just had that problem last summer. It was not the sensor that was the problem and definitly not water in the drive seal. If is a short connection in the cables going from the engine to the panel. Although, I did change the seal after 18 years of usage. The seal looked like it was new. Engine - Yanmar 3YM20 - from 2005.
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S/Y Rosetta, Hanse 342 # 245
Definition: boat, a hole in the surface of water, into which money is thrown. |
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Johan Hackman
Admiral of the Fleet
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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Posted: 08 May 2024 at 11:26 |
That is interesting to know. I am however glad that I didn't have to go down that route and look for the cause among the connections. For a while one of my two cats was the main suspect but she has been cleared now since it was the sensor that was dirty. But she has a record of biting cables before. Johan |
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Johan Hackman
Admiral of the Fleet
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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Posted: 22 May 2024 at 06:31 |
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I took the opportunity to contact my insurance company. They said that they always recommend to follow the recommendations from the manufacturer but that they could not recall any case with a broken sail drive seal.
If the boat sinks due to a leaking seal that has not been replaced a "duty of care" reduction may be applied, they said. I don't know entirely what to make of this. It is a kind of catch 22 situation. Johan |
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415 Singapore
Vice Admiral
Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935 |
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Posted: 22 May 2024 at 08:18 |
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Hi Johan
That is why we replaced our sail drive seal at Volvo’s prescribed 7 years, why pay for insurance when they have an excuse not to pay a claim, or even tell you what the reduction might be. As previously mentioned by many, the old seal was perfect, but……. All the best Paul
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Paul - Night Train - 415 #136
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pdc78
Commander 
Joined: 27 May 2016 Location: UK Status: Offline Points: 142 |
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Posted: 22 May 2024 at 08:55 |
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I recently did the same for the same reason, and whilst there was no evidence of diaphragm seal problems, the engineer did give the saildrive a full service and spotted wear in the drive plate and a choked exhaust elbow (both which I probably would not have caught until critical), so all in all I am happy that I took the decision to have the seal professionally replaced. Regards Paul
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H345 #269
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415 Singapore wrote: