Chris96 Posted January 14, 2019 Report Share Posted January 14, 2019 After some internal electrical work I'm re-installing the dash support bracket which has two bolts each side attaching it to the floor. Unfortunately on the passenger side it looks like what I assume are captive nuts under the floor are stripped. I've tried a new bolt but to no benefit which is why I assume the nuts have stripped. I cannot get under the car to get a good view and it's heavily waxoyled anyway. Can anyone give me some guidance on what the fixing is under the floor, is it possible to change the captive nuts, or is this something I pass to a garage with a lift and a man with a welding torch? Thanks for any help given Chris Quote Link to post Share on other sites
SeanF Posted January 14, 2019 Report Share Posted January 14, 2019 Hi Chris, The captive nuts for the H frame are in the chassis frame not in the floor. Cheers, Sean Quote Link to post Share on other sites
RogerH Posted January 14, 2019 Report Share Posted January 14, 2019 ....see where flag #26 is pointing https://www.moss-europe.co.uk/shop-by-model/triumph/tr5-6/body-chassis/chassis-subframes/chassis-frame-tr5-6.html Roger Quote Link to post Share on other sites
stuart Posted January 15, 2019 Report Share Posted January 15, 2019 They are welded on too, you could possibly helicoil it. Stuart. Quote Link to post Share on other sites
Z320 Posted January 15, 2019 Report Share Posted January 15, 2019 (edited) On my TR4A they are not welded, it was finger breaking to open them and I think about what I could improve before I have to put the "H" back. Any ideas are welcome. Marco Edited January 15, 2019 by Z320 Quote Link to post Share on other sites
stuart Posted January 15, 2019 Report Share Posted January 15, 2019 4 minutes ago, Z320 said: On my TR4A they are not welded, it was finger breakink to open them and I think about what I could improve before I have to put the "H" back. Any ideas are welcome. Marco They must have been broken off/removed before you got it, you could try replacing with a Rivnut. Stuart. Quote Link to post Share on other sites
DaveN Posted January 15, 2019 Report Share Posted January 15, 2019 I reckon ‘tis not a good idea to get under there with a welding torch if it’s covered in waxoyl. . However, I think you could either drill and tap to fit a helicoil or drill right through and open it out then fit a loose nut! I can’t remember but is access better with the gearbox cover removed? Someone here will know! Quote Link to post Share on other sites
Waldi Posted January 15, 2019 Report Share Posted January 15, 2019 i would use a rev nut as Stuart recommends. If the nut is welded (on my CP they are), I would tap them to the next size. Waldi Quote Link to post Share on other sites
Dave McDonald Posted January 15, 2019 Report Share Posted January 15, 2019 22 minutes ago, Waldi said: i would use a rev nut as Stuart recommends. If the nut is welded (on my CP they are), I would tap them to the next size. Waldi Waldi got in first. I believe the 1/4" UNF welded nuts are quite a generous external size and can be drilled out and tapped to 5/16" UNF without difficulty. Dave McD Quote Link to post Share on other sites
Z320 Posted January 15, 2019 Report Share Posted January 15, 2019 Thanks all, had a closer look: in item #26 and #27 there are only drilled 3/8" - without any thread, have 4 bolts 1/4" UNF, nuts 1/4" UNF, washers. Rivet nuts would be fine but I can't get them UNF for reasonal price. And the rivet must be first to make the suitable drill. But I have an idea, will report when it's ready..... Quote Link to post Share on other sites
Chris96 Posted January 15, 2019 Author Report Share Posted January 15, 2019 Thanks to all for interesting options. Might end up being chicken and give the problem to Enginuity (who have done a great job on several issues I've given them beyond my pay grade). Chris Quote Link to post Share on other sites
Z320 Posted January 19, 2019 Report Share Posted January 19, 2019 Many thanks to Stuart for his idea of rivetnuts, I made suitable threaded nipples 3/8 x 1/4. Quote Link to post Share on other sites
Waldi Posted January 19, 2019 Report Share Posted January 19, 2019 German Rivnuts:) Nice idea Maro. Waldi Quote Link to post Share on other sites
Z320 Posted January 19, 2019 Report Share Posted January 19, 2019 Quote Link to post Share on other sites
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