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Yanmar SD50 Saildrive


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Hi my son has a Leopard 46, one of his Yanmar SD50 Saildrive's has broken a couple of teeth of the gears.

He has been told that spare parts are not available for these saildrives, does anybody know of or have a secondhand SD50 saildrive or have parts.

Aparently the new SD60 saildrives are not available until March next year if you can get one here.

Any help or suggestions would be wellcome.

He lives on the boat so doesn’t want it on the hard for months.

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I find that hard to believe. Do you have a part number for whats needed? Even if it cannot be found, it may be repairable, try a gear cutting specialist like http://www.gearcutting.co.nz/page.php?id=2  or similar. If you can give me a part number, I may be able to locate the OEM part for you.

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7 hours ago, waikiore said:

Minards diesel just North of Sydney -run by a girl with more Yanmar knowledge than the current local lot. Very unusual for an SD50 to have gear issues usually it is just the cones which can be lapped fairly easily.

That was the place I dealt with - great service and was pleasantly surprised at the range of parts they had.

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Hi All for your comments.

Shane my son brought the boat in May this years and he has the boat on the hard in Whangarei, but wants to bring it back to Auckland. 

He had a marine machanic have a look at the damage SD5O it is the lower gears, shaft for the prop etc, that have the missing teeth and he also looked at the second saildrive, lower end, and he said he though there was sighs of wear slight chipping on the gears in that leg as well.

The prevous owner has miticulus maintence records and appears to have carried the required maintence. 

The Leopard launched in 2009 has 3800 hrs on the motors. The question is, how many hours would you expect to get out a SD50 saildrive.

Question; is it worth rebuilding the damaged saildrive? or would it be better to investing in a new leg?

Shane would like a second opinion, who should he talk to in Auckland?     

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No one can answer if it's worth repair without a detailed inspection. I know of several sd50's with close to 10,000 hours, however I also know of some that have been replaced at similar hours to yours. Its unusual to have a gear failure as mentioned above. Cone issues are common. Lots of owners claim meticulous service, but the issues can be hidden. Missing teeth can be operational - moving quickly from fwd to reverse,  or engaging reverse while the prop is spinning at speed when sailing etc - shock loading the SD. Once peices of loose metal are in with the gears, or teeth are missing, damage can be quickly fatal.

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16 hours ago, Island Time said:

No one can answer if it's worth repair without a detailed inspection. I know of several sd50's with close to 10,000 hours, however I also know of some that have been replaced at similar hours to yours. Its unusual to have a gear failure as mentioned above. Cone issues are common. Lots of owners claim meticulous service, but the issues can be hidden. Missing teeth can be operational - moving quickly from fwd to reverse,  or engaging reverse while the prop is spinning at speed when sailing etc - shock loading the SD. Once peices of loose metal are in with the gears, or teeth are missing, damage can be quickly fatal.

slow gear changes are also  a cause of damage click.click..click...click....click.....click......click.......click........click.........click..........click...........clunk... if you get my meaning.... a solid clunk is much easier on the box.

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