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Swim platform install-stripped screw in transom.

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Swim platform install-stripped screw in transom.

Old 10-10-2018, 12:34 AM
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Default Swim platform install-stripped screw in transom.

Installing a new swim platform (not a swim deck) on the back of my 20í outboard. Three of the screws from the old one (holding on the stainless support bracket and handle) just turn and turn but wonít come out. Iím guessing there is a gob of marine sealant on the end of them, not allowing the threads to bite into the transom and back out. I havenít tried drilling them out because I donít know if a bit will catch on the screws because they might just spin and I donít want to mess anything up. The screws for the new swim deck will use different holes I will have to drill so I could just grind off the heads, push whatís left of the screw in and then seal the holes. But, I hardly have any clearance between the screw head and the transom so Iím likely to leave marks on the fiberglass if I do that. If I try to lift the screw head away from itís hole, it comes out less than 1/8 of an inch before stopping. Iím scared to pry them out (like you would a nail with a claw hammer) because I might crack fiberglass.

Anybody have any advice or have the same problem before (what did you do)?
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Old 10-10-2018, 03:41 AM
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Well they have to come out and if they move an 1/8" in and out are probably leaking around them. I would use a sharp pry bar or wonder bar to apply some force, use a cedar shim or similar between hull and bar, and then unscrew as pressure is applied. If there is epoxy or resin on the screw and is larger than the hole you may have to cut them. a dremel with the small cutting wheel is very effective for this. good luck!
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Old 10-10-2018, 03:44 AM
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Are you sure they aren't back nutted?
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Old 10-10-2018, 03:46 AM
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Originally Posted by v12mac View Post
Are you sure they aren't back nutted?
Ideally, that's how you would want them to be. If you can access the inside, I would through bolt them. At least the top screws.
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Old 10-10-2018, 03:48 AM
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Originally Posted by v12mac View Post
Are you sure they aren't back nutted?
^^^ this... they have to be. If not, once the screws were broken free you could just pull them out.
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Old 10-10-2018, 05:41 AM
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I’m with the two posters above. I bet they are bolts it’s nuts rather than screws. Pics of your boats transom and motor well lay out could help. If you have any access to the back of where it is attached look in there. It might even be worth it to cut a small access pie plate hole to be able to through bolt the new platform.
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Old 10-10-2018, 05:41 AM
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Okay and YES! They are back nutted. I had to take out the battery under one of the back seats to find an access way to where I can see the nuts! My day just got better. Thanks everyone. (I thought the transom was solid where these bolts (which I thought were screws) go through.)
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Old 10-10-2018, 05:49 AM
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Originally Posted by RandoWhaleBone View Post
Okay and YES! They are back nutted. I had to take out the battery under one of the back seats to find an access way to where I can see the nuts! My day just got better. Thanks everyone. (I thought the transom was solid where these bolts (which I thought were screws) go through.)

Make sure to clean and dry (acetone works well) through bolt holes in transom then cover bolts and/or fill holes with high quality sealant before reinstallation.
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Old 10-10-2018, 05:58 AM
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That's great! Should be an easy fix.

On a related note. There's a guy on youtube "Boatworks today", that does demonstrations of all kind of repairs and presents discussions of different material options (like using paint vs gelcoat or epoxy vs vinylester resin with fiberglass cloth). After watching several of these, I feel confident that any one of us, with care, can make a sound repair in situations like this. To make it LOOK perfect may take a pro (to do things like matching gelcoat).
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Old 10-11-2018, 02:19 AM
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Inspect transom through holes carefully for water and rotten plywood. You are also well advised to install new stainless steel bolts, nylock nuts and backers plates, boards or at least (oversized) fender washers inside transom to spread the load inside transom.
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