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Saildrive oil rising

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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2017 at 15:55
Constantin,

After further thought on your problem I wondered if filled the saildrive completely with oil would cause damage to the saildrive. Generally it is not a good idea to over fill an engine or normal gear box which is why they have a "maximum" level on the dipstick and often state not to overfill the unit. Maybe you should check with the saildrive manufacturer to see if a header tank would cause a problem. As Roger suggested if you do fit a header tank I would think it would need to be "open" so too much pressure did not build up. 

In my example of the bow thruster gear box the unit would not run for very long and was meant to be full of oil anyway. But I have seen auto engine oil top up units on larger diesels but I think they have a level sensor and only add oil when the level goes below the required level. I guess they operate like this so there is not too much oil in the engine.  
Wayne W
Cruising, currently in the Mediterranean.
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StavrosNZ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2017 at 21:54
Haul out and have the seals replaced, anything else is a bandaid solution.
Stephen
2010 H400, Auckland, New Zealand
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2017 at 08:21
When I found oil in my saildrive I was advised that it would damage the ceramic clutch & should be removed immediately. there would be no need to re antifoul & the job can be done in a day & the boat would be out of the water for about 3 days if properly organised.
I did the job myself & from memory it took about 3 hours. If the seals are worn they will only add to your woes by causing damage to the shaft


Edited by samuel - 20 July 2017 at 08:23
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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graemefromdownu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote graemefromdownu Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2017 at 12:00
For what it is worth, you are also increasing the pressure on the nitrile engine / gearbox seal possibly forcing oil out of the gearbox into the bell housing and into the bilge. I fitted an expansion tube but when water entered into the drive leg it pushed a fair amount of oil up into my expansion bottle.
461: Dreamtime Wanderer, on her way to Australia.
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Konstantin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Konstantin Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2017 at 09:57
Graeme, thanks for the input, how high was your bottle mounted? Any pictures by chance? Was it higher than waterline?
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