Casar66 Posted October 18, 2020 Report Share Posted October 18, 2020 This weekend I spent my TR a new carpet (from a established german manufacturer, a desaster, never again, but thats another story). I have to take all the interior out, so the dashbord support thing too. 3 of the 4 threads are not good anymore. What us the exactly size of the threads? The english have so many standards. And what is the best/easiest way to repair them? Quote Link to post Share on other sites
RogerH Posted October 18, 2020 Report Share Posted October 18, 2020 (edited) 14 minutes ago, Casar66 said: This weekend I spent my TR a new carpet (from a established german manufacturer, a desaster, never again, but thats another story). I have to take all the interior out, so the dashbord support thing too. 3 of the 4 threads are not good anymore. What us the exactly size of the threads? The english have so many standards. And what is the best/easiest way to repair them? The 4 floor bolts are 1/4" UNF. The 2 through the top are 5/16" diameter - usually UNF. If the nuts have lost their thread then you will need to weld new ones back on. Or a steel Rivnut (if you can;t get 1/4UNF then M6 or M8) in a large washer pop riveted to the floor. Or a plate across the two holes underneath pop riveted on. Roger Edited October 18, 2020 by RogerH Quote Link to post Share on other sites
BRINDUS44 Posted October 18, 2020 Report Share Posted October 18, 2020 In the past I have successfully drilled and tapped the floor fixings out to 5/16 unf as a fix for this problem. The 1/4unf weld nuts on the chassis are over size, so you can get away with it. Regards Ian Quote Link to post Share on other sites
Waldi Posted October 18, 2020 Report Share Posted October 18, 2020 “ The english have so many standards” Not that much:) 99% on the TR’s bolting is UNF, and occasionally some UNC/BSF, but most “standard connections” are UNF. Cheers, Waldi Quote Link to post Share on other sites
Casar66 Posted October 18, 2020 Author Report Share Posted October 18, 2020 Thanks. Welding new ones is no option ( hopefully). Is it possible to thread a german M8? Or maybe a good adhesive? The threads are not good but not totally damaged. Quote Link to post Share on other sites
Casar66 Posted October 18, 2020 Author Report Share Posted October 18, 2020 Helicoil is no option? Quote Link to post Share on other sites
RogerH Posted October 18, 2020 Report Share Posted October 18, 2020 36 minutes ago, Casar66 said: Thanks. Welding new ones is no option ( hopefully). Is it possible to thread a german M8? Or maybe a good adhesive? The threads are not good but not totally damaged. If an M8 will fit in the foot of the dash support then consider using 5/16"UNF - at least the thread form will be in keeping. Roger Quote Link to post Share on other sites
Casar66 Posted October 18, 2020 Author Report Share Posted October 18, 2020 UNF 5/16-24 Is that the right thread? Quote Link to post Share on other sites
RogerH Posted October 18, 2020 Report Share Posted October 18, 2020 Yes. Roger Quote Link to post Share on other sites
Waldi Posted October 18, 2020 Report Share Posted October 18, 2020 Most bolts that are lose to m8 with a finer thread are 5-16 unf. Its the bext size up from 1/4 unf. Waldi Quote Link to post Share on other sites
Casar66 Posted October 18, 2020 Author Report Share Posted October 18, 2020 My favorite solution is repairing the thread with helicoil. If this will not work I try the 5/16. But I am not sure about the helicoil Quote Link to post Share on other sites
Waldi Posted October 19, 2020 Report Share Posted October 19, 2020 It has little load on it so should be possible I feel. Waldi Quote Link to post Share on other sites
ed_h Posted October 19, 2020 Report Share Posted October 19, 2020 As an expedient repair, get a 1/4 UNF bolt 1/4 inch longer than the original. Screw it in as normal and add a new nut below. Ed Quote Link to post Share on other sites
Casar66 Posted October 19, 2020 Author Report Share Posted October 19, 2020 (edited) yes, that will be the easiest way but if I ever sell my car the future owner will send me to hell. Waldi, I will try the helicoil. btw, what is the correct thread for stud (rear hub unit to trailing arm)? Edited October 19, 2020 by Casar66 Quote Link to post Share on other sites
RogerH Posted October 19, 2020 Report Share Posted October 19, 2020 5/16" UNF Roger Quote Link to post Share on other sites
Casar66 Posted October 19, 2020 Author Report Share Posted October 19, 2020 thank you, Roger. Quote Link to post Share on other sites
Bill944T Posted October 19, 2020 Report Share Posted October 19, 2020 The english have so many standards Why not try a home grown PG thread that are the bane of my English life?!!! Regards Bill Quote Link to post Share on other sites
Phil Read Posted October 21, 2020 Report Share Posted October 21, 2020 On 10/18/2020 at 7:41 PM, Casar66 said: The english have so many standards. Not any more, all is metric on new cars, that is until January then we go American. Quote Link to post Share on other sites
Casar66 Posted October 21, 2020 Author Report Share Posted October 21, 2020 Quote Not any more, all is metric on new cars, that is until January then we go American. wish you all the best with your new friends! The grass is always greener on the other side. Quote Link to post Share on other sites
UMD31M Posted October 25, 2020 Report Share Posted October 25, 2020 Hi, For helicoils, I did a couple a couple of rear hub stubs just a few weeks, using this kit from rally-design on EBay - picture attached hopefully. Comes with the correct drill and tap for the helicoil as well as a handful of helicoils and the insertion tool. Worked very well Indeed - as long as you have an electric drill and a tap handle. Tim Quote Link to post Share on other sites
Casar66 Posted October 25, 2020 Author Report Share Posted October 25, 2020 I got the set, but the inserts are too long (1.5 D). I got shorter ones (1D). I tried them at a worn thread for the seat rail (same size as the nut for the dashboard support) and it works. Quote Link to post Share on other sites
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