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Old 14-03-2015, 00:26   #1
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Location: Australia
Boat: 40' Catamaran
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Yanmar SD20 sail drive broken

G'Day All

We have lost gear selection due to an internal pin that locates the forward and reverse lever on the selection shaft dropping out.

Questions
Anyone else experienced this?
Why would the pin just fall out? - we've never had drive open
Where is pin likely to be ... if we just replace it the old one presumably has the ability to jam in the gears

Photo shows clear hole where pin should be.. lever just rotates.

Looks like developing into a big job for such a tiny part....
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Old 25-09-2015, 18:30   #2
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Re: Yanmar SD20 sail drive broken

Quote:
Originally Posted by Woodyv12 View Post
G'Day All

We have lost gear selection due to an internal pin that locates the forward and reverse lever on the selection shaft dropping out.

Questions
Anyone else experienced this?
Why would the pin just fall out? - we've never had drive open
Where is pin likely to be ... if we just replace it the old one presumably has the ability to jam in the gears

Photo shows clear hole where pin should be.. lever just rotates.

Looks like developing into a big job for such a tiny part....
How we fixed

The internal gear selection lever pin is the one I broke and is accessible relatively easily on the top part of the drive. Once I had detached the cable the lever could be moved in a circle without any perceived change in the selection of forward or reverse. I just undid the four bolts holding holding the lever to get access. The part comes off easily but the oil level is above the bottom of the opening so you will need a few rags to absorb the overflow.

I was lucky to be able to find both halves of the broken pin. I took the plate off the top of the drive - another 4 bolts - and a bit difficult to pull off as it locates a bearing recessed into its bottom side. I tried gently to no avail and eventually had a rush of blood to the head attacked it with a chisel and hammer - without any damage fortunately. There is not much space around the gear cogs so I used a magnet on a springiny thing I bought from the auto store to retrieve the broken pin halves...lucky!!
You could try to find the bits thru the lever hole before removing the top plate but I didn't have any success.

The Part to order from Yanmar is 22301-040250. Yanmar actually sent it to me for free - it's worth about $2.00. They said the had never heard of this happening before. The pin is tapered and needs to go in the correct way.
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Old 25-09-2015, 19:58   #3
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Re: Yanmar SD20 sail drive broken

Thanks for posting a followup.

Do you have any photos of the saildrive with that plate off the top and is there a technique to remove it? Does that give you access to replace/inspect top bearings etc?

I am planning to service mine soon and was thinking of inspecting the top end.
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