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Old 28-03-2012, 12:44   #1
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SD30 Saildrive Question

There is a rather large opening in the hull around the exit of the saildrive on my 44' trimaran. It is a bit of a performance boat, and something like this on the bottom of the hull seems like a big screwup. I know that the engine must have some wriggle room, but I really don't want the critters that live in the hole or the turbulence which must result from the big rectangular gap in the hull form.
The after edge fits about as well as the fwd. in the pic. How can I get rid of this gap without adversely affecting the drive unit?
I could fill it with expanding foam and razor cut it and glass over and paint it. Perhaps a single layer of 6 oz glass would still be flexible enough to allow enough movement to keep it happy.
I suppose I could get some very slippery sheet (HDWE or such) plastic and cut it to fit over the leg and screw it to the hull at the edge.
Either of these would slow the ingress of sea water when the rubber boot fails around the drive leg.
Any other Ideas?
Don't bother telling me to junk the saildrive. I would love to, but it works well and would be a big bump in the project chart at this time, in cost as well as effort. When it takes a dump( I hear they all die young ), that may be an option as I would love to move the engine away from the transom, but not now.

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Old 28-03-2012, 13:40   #2
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Re: SD30 saildrive question

Your saildrive is missing the boot. This part isn't intended to be water tight, but rather to smooth out the water flow and keep critters from crawling up inside.

Here's a link to the part.

Yanmar 196420-02551 Sailboat Supplies, Engine Parts and Boat Parts

Securing these things is often interesting. We've tried various glues with varying success. We've never actually lost one, but they do work loose over time. This last time, we got "serious" and used 5200. We'll see!


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Old 28-03-2012, 13:53   #3
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Re: SD30 saildrive question


Just replace the lower rubber boot that fell off the hull. It is just glued on.
It should look like this when its on. They glue on with contact cement.
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Old 28-03-2012, 15:26   #4
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Re: SD30 saildrive question

Thanx guys, I see a difference in the paint color around that area, probably where it came off. Mine is actually an sd31 which is part # 196420-02550. 5200 may be in order just because it takes a haulout to replace it.
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Old 28-03-2012, 20:23   #5
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Re: SD30 saildrive question

After much hassle with having lower boot adhere...8 years ago
I took an old timers suggestion to use Boatlife chaulk to adhere
boot...the same boot is still on the boat adhering as solid as the day I installed.
I have just updated a old thread (2008)titled "saildrive boot" that goes into detail if of interest.
s/v Little Jumps
Lancer 30
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Old 19-04-2012, 18:49   #6
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Re: SD30 Saildrive Question

I can never seem to keep mine on. Had to use starboard screwed into the hull arround the edge of the gasket.

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