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Old 20-11-2009, 18:06   #1
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Yanmar Saildrive Leak

yo i eeehave a leak in my saildrive boot how do i fix it ....jt
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Old 21-11-2009, 03:04   #2
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Lift the boat onto the hard immediately if the alarm for water ingress has sounded! Can only be fixed by replacing the booth.

Happy lead ree sailin
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Old 23-10-2017, 13:12   #3
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Re: Yanmar Saildrive Leak

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Originally Posted by Lucky View Post
Lift the boat onto the hard immediately if the alarm for water ingress has sounded! Can only be fixed by replacing the booth.

Happy lead ree sailin
Immediately? If there isn't much water getting into the engine room through the boot then personally I would schedule the next haulout for a boot replacement. The warning is an indication that it's time to replace the boot, not some dire prognostication that the boat is about to sink.

Check the boot for cracking, perished rubber etc. then make your decision.
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Old 23-10-2017, 13:55   #4
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Re: Yanmar Saildrive Leak

If the alarm goes off I would look for a nearby yard capable to lift out my cat. Its not an mayday type emergency but also not something I would wait for weeks / months to take care of.
More so if you already have a leak into the engine room.


The upper seal of the Yanmar SD is not meant to be a permanent reliable seal. Its much thinner compared to the main seal, and its attached to the SD with two simple (but ridiculously expensive) steel bands holding it in place. Its just a last resort that can easily fail.


Replacement of the seal is expensive, around 500 in parts plus several hours of work (per engine). Its a good time to overhaul the SD, replace shaft seals, maybe bearings, have it sanded down and freshly coated, etc

EDIT: I have the service manual for the SD20 in case that is your SD model
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Old 23-10-2017, 14:02   #5
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Re: Yanmar Saildrive Leak

Let's get some feedback from others then, I'll be curious. Our SD30s have huge thick diaphragm "boot" seals. We had a water alarm that had been going off for a year over 6,000 miles of sailing but little water intrusion into the engine room and when the saildrive was out it looked solid. I've read many discussions about this and the vast majority report the same.

Quote:
Originally Posted by rabbi View Post
If the alarm goes off I would look for a nearby yard capable to lift out my cat. Its not an mayday type emergency but also not something I would wait for weeks / months to take care of.
More so if you already have a leak into the engine room.


The upper seal of the Yanmar SD is not meant to be a permanent reliable seal. Its much thinner compared to the main seal, and its attached to the SD with two simple (but ridiculously expensive) steel bands holding it in place. Its just a last resort that can easily fail.


Replacement of the seal is expensive, around 500 in parts plus several hours of work (per engine). Its a good time to overhaul the SD, replace shaft seals, maybe bearings, have it sanded down and freshly coated, etc
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Old 23-10-2017, 14:32   #6
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Re: Yanmar Saildrive Leak

It depends...
If the leak comes from a failed main diaphragm its time to get worried in my view. As soon as it starts to crack it is likely to develop more cracks or fail badly.
Just like my exhaust hose: I fixed a small leak on passage, and just moving this brittle hose caused new leaks to pop up faster than I cold fix.


But of course there is the possibility to develop a leak without a cracking diaphragm. It could be a leak at the sealing joints between hull / seal / SD. In that case I would not be worried too much.

In fact we once experienced this after running into a huge pile (size of a house) of abandoned fishing net floating just under the surface. That incident slightly dislocated the SD and cracked the fibreglass under the SD and around the bolts. We had a smallish leak.
And this happened just weeks after replacing the main diaphragm, so the diaphragm was certainly OK.
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Old 23-10-2017, 21:34   #7
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Re: Yanmar Saildrive Leak

would suggest to make engine room watertight. Especially if not changing seal immediately and even if you do.

Extra insurance.
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Old 23-10-2017, 22:22   #8
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Re: Yanmar Saildrive Leak

Strange coincidence..

My yanmar SD20 saildrives were overhauled professionally one year ago and all the seals/boots were renewed. A few weeks ago, one alarm started sounding, at first intermittently and then continuously. I removed the alarm sensor cautiously and, sure enough, there was water in the chamber between the two seals, but no immediate flow. I sucked out the water with a thin tube and then used several wicks of twisted paper towel to remove the remaining water. Since then the alarm has not sounded again. It's clearly not a case of brittle rubber, and there has been no collision or rope around the prop, so it can only be either careless sealing around the lower boot on assembly or possibly some defect in the GRP hull itself which is allowing minor inflow around the saildrive aperture. Either way, it cannot lead to any catastrophic inflow and I'm reluctant to remove the saildrive to check, even though a haul-out is due soon..
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