Nacra 5,7 beam strap bolt hole screw thread lost, how repair

Hi!

Just bought Nacra 5,7, and found that 2 of front crossbeam strap bolt holes has lost its screw thread.

Does anyone has a good solution for repairing screw threads, so the crossbeam can be fastened tightly and properly.

Thaks,
Agur
Estonia

auto parts stores sell a product called a helicoil repair kit This type of repair has worked fine for me in the past.The other option is to drill and tap for next size up bolt

It's a pretty simple fix. Buy the next size larger tap and tap the hole and replace with the larger bolt. You will need to carefully drill the SS strap a little bit larger to allow the larger bolt to pass through.

Thanks a lot for a quick reply!

I will try this new larger size tap method.

Regards

Agur

Does this helicoil will be strong enough compared with new larger tap?

It would be stronger to drill and tap for a larger bolt (more thread area in contact with each other).

I would also recommend Teflon coating the new bolt or using a few dabs of water proof grease when putting them in.

From Greg's Tips


From Greg's Tips... replace beam bolts

I miss Greg.

Just for information - how thick walls has this inner bolt tube?

I think that using a DROP-IN Internally-Threaded Expansion Shell Anchor insn`t good idea? It will probably damage the tube walls and surrounding fiberglass?

Your last question, probably not a good idea. The other two options is what I'd go with.

As has been said, it is crucial to use a good, long lasting anti-seize coating when reinstalling.

I don't think it's a tube , but a plate embedded in the layup of the hull. That is definitely the way it is in my N20 as I had to re mount it after too much beating on it trying to get out a broken bolt with a broken EZ out inside of it. My guess would be it's the same program with the strap as with the beam bolt.

There is a helicoil kit made for aluminum motorcycle engines that seems to work the best. It included a plastic sleeve and a 2 part mixture that looked like epoxy. This combo was supposed to passivate the aluminum and electrically isolate the SS helicoil from the aluminum. I would check with a local motorcycle shop.

thanks everyone for advices! I used this time helicoil and seems that it works fine.

thanks!

agur