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Old 05-06-2019, 09:21   #16
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Re: Yanmar SD25 sail drive oil change

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Sorry, what's your point?
The point being poor design and choice of materials so short lifespan. So only own one once.
Shaft drive next. Love the idea, however.
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Old 05-06-2019, 13:41   #17
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Re: Yanmar SD25 sail drive oil change

My point it its like musical chairs, Just make sure you dont own it when the music stops. !
I had a friend take out his Yanmar and go with a sail drive. Like 7 years later the Florida Salt water ate the thing?
I have no idea if it was stray current or a bad ground, But he took it out glassed the hole and put another diesal in here !
He was a marine mechanic
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Old 05-06-2019, 15:01   #18
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Re: Yanmar SD25 sail drive oil change

This must have been your friend's sail drive then...

Deferred maintenance is at the base of most of the problems...



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My point it its like musical chairs, Just make sure you dont own it when the music stops. !
I had a friend take out his Yanmar and go with a sail drive. Like 7 years later the Florida Salt water ate the thing?
I have no idea if it was stray current or a bad ground, But he took it out glassed the hole and put another diesal in here !
He was a marine mechanic
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Old 05-06-2019, 15:14   #19
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Re: Yanmar SD25 sail drive oil change

Thank you very much for the information B4A.
As for corrosion, I guess prevention is essential, especially on component using more than one kind of metal.
It's a first for me, having a sail drive on the engine. But the boat fitted my program and my budget for the time being, so ...
Thanks again, this forum is really a great source of information.
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Old 05-06-2019, 16:21   #20
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Re: Yanmar SD25 sail drive oil change

I think a must is to install a galvanic isolator.

Before I installed one I hung a zinc "guppy" connected to the engine block and immersed in the sea. With that, the zincs were near the end of their life at haul out every 20 months. With the isolator, the zincs still have a lot of life after as long as 40 months.

I also am an advocate for installing a oil header tank for the sail drive oil. I have had them for over 15 years.
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Old 07-06-2019, 07:09   #21
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Re: Yanmar SD25 sail drive oil change

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I think a must is to install a galvanic isolator.



Before I installed one I hung a zinc "guppy" connected to the engine block and immersed in the sea. With that, the zincs were near the end of their life at haul out every 20 months. With the isolator, the zincs still have a lot of life after as long as 40 months.



I also am an advocate for installing a oil header tank for the sail drive oil. I have had them for over 15 years.


The galvanic isolator come standard with my 2018 Leopard 40.

Do you have pics of the oil header tank?
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Old 09-06-2019, 13:40   #22
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Re: Yanmar SD25 sail drive oil change

I don't think I have a picture of the header tank, but they can be found on the internet.

When the ones that I ordered (Mercruiser inboard) didn't come in time, I made tanks out of Lucas fuel injector cleaner bottles.

https://www.google.com/search?client...UTF-8&oe=UTF-8

Washed out w/acetone, cut the bottom off, epoxied a plastic 1/4 MNPTX 1/4 barb fitting and made a cap out of the outer part of a child-proof cap from a gallon of pink antifreeze.

Works fine, they are small, and cheap!
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Old 15-06-2019, 13:35   #23
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Re: Yanmar SD25 sail drive oil change

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Hi Jacana,

do you own a SD25 sail drive and were you able to extract 2 liters with that?

Regards,
Mine are SD20 sail drives.I use the same extractor pump as per previous photo.It has a thick tube going into a thin tube ,when putting tube into oil filler if I wiggle around I can then slide it down inside the sail drive and can extract about 1.5 litres.
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