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Old 06-26-2021, 06:38 PM   #1
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Default Pedestal Mount Issue

Hello all,

I searched through the project folder and didn't find a post with my issue. If I missed it, my apologies.

I have a 1995 1800 SR2 and have a floor repair in process. I decided to remove the pedestal bases to 1) get the carpet out of the way and 2) replace the carpet.

My issue, the "mounting nuts" are spinning and will not tighten when I go back together. My original thought was to clean up the area and use some metal epoxy to "weld" them from spinning. I cleaned up one nut with success with a dremel and a wire cleaning brush. I started on the next and the metal (aluminum) flange disintegrated. What I have been able to figure out is there is some sort of aluminum plate under the floor deck where all 6 "nuts" attach for the long bolts to screw in from above. There is not access under the flooring and the area outside the stingers is filled with Styrofoam of some sort.

The floor deck is reinforced at the pedestal mount with what is estimated to be another 3/4" of marine plywood which is encapsulated with a fiberglass epoxy.

Please see attachments of area and spinning nuts.

I am looking for suggestions short of cutting the entire floor out from Port to Starboard to replace the mount ring.

Thanks

rsav8tr
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Old 06-27-2021, 11:40 AM   #2
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Hello,

If the pedestal is for a table I would consider filling the holes with epoxy and use sheet metal screws to attach.


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Old 06-27-2021, 03:28 PM   #3
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I guess I didn't specify, this is the helm and passenger seat pedestals. I have considered filling the holes with epoxy and spinning the base a few degrees and then lag the base in. Thanks for the suggestion!
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Old 06-27-2021, 10:15 PM   #4
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Looks like the inserts are Rivnuts, you might be able to drill them out and install new ones.
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Old 07-25-2021, 08:50 AM   #5
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I recommend you use the West System epoxy resin. It ideal for boat building and repairing to prevent damages from collision, aging, and forces of nature. This epoxy can cure in any temperature and can last long. It does not shrink, nor does it have a strong odor. So, it is safe to say that it is harmless to use, unlike polyester or vinylester resins.
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Old 07-25-2021, 10:38 PM   #6
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Hello Donald,

Thanks much for the suggestion, checked at work and we had a tool so I borrowed it. I ordered aluminum rivnuts through a major online store. I have two that did not hold but I have not borrowed the tool again for a second attempt. The other 7 replacements on the two bases are holding nicely.
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