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Broken Screws In Transom

Old 05-07-2020, 08:08 AM
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Default Broken Screws In Transom

Hi All,

I decided to replace my trim tabs today due to severe corrosion and rust at the welds (I will be installing zincs on the new ones). Long story short, while taking out the screws from the back plate, (4) screw heads ripped off, leaving the screw body in the hull. I have already tried using a left hand screw bit and screw extractor to no prevail. Two of the screws are sticking out a little bit, but not enough to have a firm grasp with vise grips.

What do you recommend? Should i drill out the screws the best i can, fill with epoxy and then create new hole in the backplate of the trim table?




Thanks for all the help.

Old 05-07-2020, 08:35 AM
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Broken Screw
Gerald
Old 05-07-2020, 08:37 AM
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go get the best metal drill bits ($$$) you can find...buy a couple. Drill those screws out. Use new oversized screws with Loctite PL Marine sealant to reinstall trim tabs back in the now slightly larger holes.

Or....drill out the screws.....drill oversized holes. Fill with expoxy.....redrill correct size holes in the epoxy, reinstall with sealant and correct size screws.

Honestly....what I would do with my existing boat.....drill out the screws until they can be sealed up with 5200. Redrill new holes in the plate and the hull. Install trim tabs using new holes with sealant.
Old 05-07-2020, 08:40 AM
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Just use a micro hole saw slightly larger that the screw shank.
Old 05-07-2020, 08:55 AM
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I'd take a Dremel tool to them with a pointed grinding tip. Grind them to about 1/8" below the surface, countersink to eliminate gelcoat cracking and fill them with Marine-tex, and drill new holes for tabs.
Old 05-07-2020, 08:57 AM
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NM, by the time I posted, the rolled pin answer was offered.


Old 05-07-2020, 08:59 AM
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There was a trick that involved using a roll pin to get them out. Pretty sure it was posted here at one time. edit: my bad, didn't read Gerald's post above.
Old 05-07-2020, 09:00 AM
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Same advice for this? Looks like head of a screw on my trim tabs broke off. Or can I safely ignore for now? the heads on the other screws look like full removal may be a PITA...

Old 05-07-2020, 09:21 AM
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Originally Posted by mystery View Post
Same advice for this? Looks like head of a screw on my trim tabs broke off. Or can I safely ignore for now? the heads on the other screws look like full removal may be a PITA...

Surely you've already searched this and have already learned that the probability of having corrosion on each screw is high and the sooner those screws are replaced the better because more of those heads are coming off. It is typical for those screws to fail in that manner.... But you can read all about it ,try the search function.
And by the way, that zinc is not working.
Gerald
Edit, never mind, I forgot, I'm on your ignore list
Old 05-07-2020, 10:44 AM
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Thanks for the reply guys. This is turning out to be a mess.
I was able to get one of the the screws out by cutting the shaft with a Dremel and removing with flat head screw driver. The other 3 screw heads, are not coming out, and i feel i'm making it a bigger issue than it should be...,should i continue drilling them out?

I was thinking of just filling the holes with six10 epoxy and fiberglass and adding new screw holes to trim tab.



Old 05-07-2020, 10:47 AM
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Also, with the chips to the gel coat, will the epoxy be sufficient?
Old 05-07-2020, 12:27 PM
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Okay.. I bit the bullet, bought the plunge hole saw and got all the screws out. what would your recommendation on filling these holes? Six10 epoxy okay you use?




Old 05-07-2020, 01:09 PM
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Originally Posted by commuter boats View Post
That is the best trick I have seen in years!
Old 05-07-2020, 01:12 PM
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Dish out the top of the hole with a counter sink and fill with epoxy and cabosil, fair and reinstall your tabs
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Old 05-07-2020, 01:47 PM
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Thanks Tsnuami-
Would cut-up fiberglass strands work just as well as cabosil with the six10? Sorry this is my first fiberglass repair
Old 05-08-2020, 05:37 AM
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Originally Posted by djs4426 View Post
Thanks Tsnuami-
Would cut-up fiberglass strands work just as well as cabosil with the six10? Sorry this is my first fiberglass repair

Cut glass is too course IMO. Cabosil is glass powder. Mix to peanut butter consistency. Make sure the hole is clean and dry. Flush with Denatured alcohol or acetone. You could even drive a wooden bung into the hole with epoxy and the seal with epoxy. In this case the cabosil is enough. Use a longer screw in the repaired hole so they bite into the transom beyond the repair.
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Old 05-08-2020, 06:09 AM
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You can get G10 fiberglass rod from McMaster Carr. I would drill a good clean hole that matches the diameter of rod that you get and then epoxy them in. After everything is cured, re-drill your holes.

https://www.mcmaster.com/grade-g-10-...g-10-fr4-rods/
Old 05-08-2020, 06:23 AM
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For future reference, a plug cutter is what I use for situations like this. 1/4" would have worked well for your situation. To fill the hole, I would use some west system epoxy thickened with one of their adhesive fillers. You can even tint the epoxy if you are not painting over and don't want to bother with gel-coat in an obscure area. Fill the hole not all at once making sure the void is completely filled. Place a piece of scotch tape over the hole and press the epoxy flat/flush to the hull. Pull the take off the next day. Sand any high spots out.
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Old 05-08-2020, 06:30 AM
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Thanks guys. I ended up using the 3/8" plug cutter to get around the screw and turned it out with channel lock pliers; Worked very well i think.
The holes are roughly, 1/2", I plan to fill with six10 epoxy with Cabosil, then redrill the holes for the trim tab screws.

My one question, is a 1/2" hole bellow the waterline to large for this epoxy?



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Old 05-08-2020, 01:50 PM
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If you are talking about West Systems 610 - it is already thickened, just my opinion, but no need to add anything to it.

Overfill slightly in case it shrinks a bit as it cures, then sand flush.

-- Tom

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