I’m working on removing the trampoline on my 26yr old nacra 5.8. I’ve got the straps loose on the forward cross bar and when I loosened the bolt inside the crossbar the nut plate seems to slide down… I’m worried about loosening the bolt completely and having the nutplate inside the hull fall free. I’ll have no way to reassemble. What’s the correct way to do this? I’m talking about the bolt for the internal beam casting.
Is the nut plate captured so I’ll be able to reassemble once I separate the forward crossbar from the hull and attach the new trampoline?
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1987 Nacra 5.8
1978 Isotope (sold)
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Nacra 5.8 trampoline removal and replacement ??
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- Rank: Lubber
- Registered: Jun 25, 2015
- Last visit: Jun 16, 2024
- Posts: 36
Posted: Jun 16, 2024 - 04:28 PM
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- Rank: Mate
- Registered: Jan 14, 2004
- Last visit: Sep 25, 2024
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Posted: Jun 16, 2024 - 05:19 PM
The plate is laid up in glass sheets. It shouldn't be loose.
You should try the other side. Or loosen both sides up and raise/rotate the beam forward, just enough to get it out on one side. You only need to rotate it a little to slide out the tramp.
If you continue to have problems you might need to add a port, which I would avoid at all costs if possible.
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Philip
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- Rank: Lubber
- Registered: Jun 25, 2015
- Last visit: Jun 16, 2024
- Posts: 36
Posted: Jun 16, 2024 - 06:06 PM
Yeah this is what I thought. So when the bolt wasn’t coming up as it loosened I got concerned. I was able to tighten it back up so the bolt is good I’m guessing the nut plate just broke free from the layup. I’ve moved over to the other side but that bolt doesn’t want to break free at all. (The strap bolts are in great shape and came loose nicely) I’ve got penetrating oil on it now but I doubt it’s worked its way into the threads. The bolt head and cast block have a bit of corrosion locking them together, I’m hoping it will come out without any fuss, but I’m worried this one may fight.
So if the other side won’t come out as it should, (I’m worried I won’t get it loose at all without breaking the bolt). Is the best bet to Dremel an opening into the slot for the trampoline bolt rope?
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1987 Nacra 5.8
1978 Isotope (sold)
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- Rank: Mate
- Registered: Jul 29, 2015
- Posts: 590
Posted: Jun 16, 2024 - 07:09 PM
The hold-down bolts are supposed to be loosened and maintained annually, but few of us do. I would not hesitate to drill into the bolt plate space and inject some epoxy. Every bolt can "budge", depending on the wrench or impact driver you put on it. It's worth using some penetrating oil to try to lubricate the threads. The help files area on this site have several threads on resetting the bolt chips. Worst case, you an drill out the bolts and tap new threads, then replace with a larger diameter bolt.
Edited by tominpa on Jun 16, 2024 - 08:11 PM.
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Tom
NACRA 5.7 (1984 Sail 181)
Pennsylvania
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- Rank: Mate
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Posted: Jun 17, 2024 - 05:25 PM
I think I would go from the top and maybe try to hit two corners diagonally opposed from the center. Drill into the crossbar support chip and inject epoxy to fill the void and prevent the internal chip from rotating when you loosen the bolt. Use a good anti-seize compound on the bolts before re-assembly. I'm sure the tech section has some articles on replacement of that bolt, but stuff is getting really hard to find on this site.
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Tom
NACRA 5.7 (1984 Sail 181)
Pennsylvania
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- Rank: Mate
- Registered: Jul 29, 2015
- Posts: 590
Posted: Jun 19, 2024 - 07:28 PM
Well, that's just great news the penetrating oil worked. Most of the time the bolts will release with some patience. Icon, you need to log-in every visit. The new site software is an absolute disaster. Note when I quoted you, it came in as "spammer1", and that's why I quoted your post.
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Tom
NACRA 5.7 (1984 Sail 181)
Pennsylvania
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