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Old 10-09-2019, 10:52 AM   #1
Haz
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Default Repairing crossmember captive seat nuts

As per title... Does anyone have any experience repairing the attachment hole threads in the cross member that your seat brackets attach to? Mine won't tighten up anymore, the threads have gone. A tap (at standard size) wouldn't help.

Has anyone tapped up to the next size? Did you helicoil back to OEM size or run a larger bolt?

Any info would be appreciated. Ideally it'll be done in situ. I have zero experience welding or panel fitting.
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Old 10-09-2019, 02:21 PM   #2
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I used rivnuts to fit an extended seat bracket, you’ll need a tool to fit the rivnuts but these can be relatively inexpensive plus you gain a new tool!


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Old 10-09-2019, 03:22 PM   #3
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Not sure I'd trust my seat being held in with rivnuts, they are great for little brackets and things though.
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Old 10-09-2019, 04:00 PM   #4
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That’s a fair point edk

How about this... a hole saw at the opposite side and just put a normal nut on?
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Old 10-09-2019, 04:11 PM   #5
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Steel rivnuts fitted correctly are rock solid, they’re used for seat mounts in later Defenders!
I wouldn’t use the alloy type, that’s just stupid, but the steel ones are more than up to the job.


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Old 10-09-2019, 07:59 PM   #6
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I'm not sure I'd trust Rivnuts either for a seat mounting, I've found them a bit hit and miss over the years. I'd probably go with the idea of drilling a hole just big enough for a socket and nut if welding was out of the question.

But if you want a great tool for inserting them, which also does rivets try this

https://www.lasertools.co.uk/product/3736

Don't be put off by the price it can be found for a lot cheaper - we paid £73 four years ago, although probably a bit pricey for DIY or one off jobs.
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Old 10-09-2019, 10:36 PM   #7
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Wee DIY tool for fitting rivnuts if you go that way, just study the picture and you'll work out how to do it. attachment.jpg

or drill out the old nuts and weld in some of these in an appropriate size https://www.ebay.co.uk/itm/WELD-T-TE...4j-Cs6A-1CiXxQ

with the threaded nut part put into the old hole and weld the flange to the cross member. Not got a welder then you'll likely have a local mobile welder chap who will come to you.

Last edited by juggernaut; 10-09-2019 at 10:47 PM.
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Old 11-09-2019, 07:19 AM   #8
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I don’t see the problem with rivnuts being used here. It would only be a problem if the seat belt buckle was mounted to the seat frame
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Old 11-09-2019, 09:14 AM   #9
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I'm not going to be welding anything.

I'll have a look at the rivnuts but I'm really leaning towards my basic bodge fix of hole sawing the opposite side. It's only 1 that needs repairing so it's not like the cross member will be riddled with holes.

Keep it simple stupid
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Old 11-09-2019, 11:52 AM   #10
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Tapping a larger size would be difficult as the bottom hole is so close to the floor to get a straight thread. Why not drill all the way through the channel and out the other side then fit a 120mm bolt and fix the nut on side under the seat?
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Old 11-09-2019, 01:13 PM   #11
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I’m an aircraft fitter by trade so restricted access holes are my bread and butter

I like that idea Bumble, but it will involve the purchase of a long drill bit and bolt

I’ll try that first, if it fails for any reason I can open it out with the holesaw.

Cheers gents
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Old 12-09-2019, 05:34 PM   #12
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Had the same thing happen to me before. I just got some threaded bar and drilled a hole on the other side, fit some large washers and a couple nuts either end and away you go. Just measure where to drill a hole, no need to buy a long drill bit!
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Old 12-09-2019, 07:48 PM   #13
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Haha cheers, I actually just bought some threaded bar from screwfix on the way home

Should be back on the road next week with a new dash & clocks

.... and hopefully some vtec solenoid gaskets solve my oil leak woes!
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