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Thread correct size and repair


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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? 

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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 by RogerH
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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

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“ 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

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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

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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

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