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Sail drive shaft seal


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#1 raz88

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Posted 11 November 2018 - 07:56 PM

I have a Volvo ms25s sail drive, which has water in the oil. It has also started leaking oil from up top - I guess seawater has got in and pressurized it and caused it to spring another leak from the top of it somewhere.

So I need to replace the shaft seal on the sail drive, and find the leak in the top of it and replace that seal too.

So my questions for the team are

1.Does anyone know what's involved in changing the shaft seal?

2.does anyone know the likely source of the leak from the top of the sail drive unit? If so, is it likely to require removal of the sail drive to replace?


Thanks
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#2 Island Time

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Posted 11 November 2018 - 08:22 PM

Shaft seal is pretty easy. Take off prop, anode, bearing carrier - bearing carrier has the shaft seal as well. If the cause of the leak is a damaged shaft (a piece of fishing braid can cut into the shaft) then it needs to be fixed or the new seal will leak. If there is a groove in the shaft you can catch your fingernail in, either remove the shaft and get an engineering shop to repair the shaft, or cover it with a speedy sleeve (cheap and works great). Check the play in the shaft as well.

 

Top leak, you'll have to find. Could be simply the o ring around the filler cap, or the dipstick one. Clean it up, look for where its coming from. 

 

And then, once its going, check the oil more often!!


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#3 raz88

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Posted 12 November 2018 - 12:52 PM

Thanks.

Am I likely to need a puller to get the bearing carrier off the shaft or the seal off the bearing carrier?
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#4 Island Time

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Posted 12 November 2018 - 03:35 PM

Not normally
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#5 Frank

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Posted 12 November 2018 - 07:46 PM

Shaft seal is pretty easy. Take off prop, anode, bearing carrier - bearing carrier has the shaft seal as well. If the cause of the leak is a damaged shaft (a piece of fishing braid can cut into the shaft) then it needs to be fixed or the new seal will leak. If there is a groove in the shaft you can catch your fingernail in, either remove the shaft and get an engineering shop to repair the shaft, or cover it with a speedy sleeve (cheap and works great). Check the play in the shaft as well.

 

Top leak, you'll have to find. Could be simply the o ring around the filler cap, or the dipstick one. Clean it up, look for where its coming from. 

 

And then, once its going, check the oil more often!!

What he said , just check the oil on a regular basis, this might help 


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#6 raz88

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Posted 13 November 2018 - 08:57 PM

Thanks for the video. Hopefully mine is the same as that - havent been able to find a similar one for the ms25s.
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#7 raz88

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Posted 15 December 2018 - 01:15 PM

Shaft seal is pretty easy. Take off prop, anode, bearing carrier - bearing carrier has the shaft seal as well. If the cause of the leak is a damaged shaft (a piece of fishing braid can cut into the shaft) then it needs to be fixed or the new seal will leak. If there is a groove in the shaft you can catch your fingernail in, either remove the shaft and get an engineering shop to repair the shaft, or cover it with a speedy sleeve (cheap and works great). Check the play in the shaft as well.

Top leak, you'll have to find. Could be simply the o ring around the filler cap, or the dipstick one. Clean it up, look for where its coming from.

And then, once its going, check the oil more often!!


So having got it all off the seals appear to be contained in the bearing carrier by a face that's pressed in and will take a press to get out. Any idea of another way without a press? Thinking of trying a cold chisel but worrying about damaging it.
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#8 raz88

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Posted 15 December 2018 - 02:38 PM

Update, it tapped out with a small cold chisel quite happily.
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