Deforming thread to lock the nut permanently

[edward995]

I have seen some method to distorting/deforming the thread to prevent it from loosening, like staking or center punch one or more of the nut faces. Is this way suitable for larger and higher strength nut?
I am trying to apply it on 1 1/2 inch nut (30HRC) , any idea what kind of machine should I use?

 

[hydtools]

We don't know if the OP application has an anchor point for the lockwire idea to work.

Ted

 

[Tmoose]

" devices that were submerged in hot oil"

F1 con rods are not submerged in hot oil, but are likely sprayed with oil at 200°F or more for hours at a time, and subjected to 100s of gs acceleration that varies direction 1000s of time a minute.
Not a single wrap of safety wire or a single DIN 7967 or Pal nuts to be seen.

https://imagizer.imageshack.com/a/img924/310/B8OKTW.jpg

https://imagizer.imageshack.com/a/img922/759/qVPIF2.jpg

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70 years ago in engines expected to run at least 100,000 mile at 4000 rpm or so we might have seen this -

https://i.ebayimg.com/images/g/w~QAAOSw-VdalrhX/s-l1600.jpg

I am confident that those sheet metal Pal nuts were, and are, incapable of talking an under-tightened nut off the ledge.

 

[Tmoose]

To FACS,

I was envisioning something like this -

https://www.jalopyjournal.com/forum...264/full?lightbox=1&last_edit_date=1399655450

The crankshaft appears to be largely intact.
It may be more likely that the engine block broke than fasteners "loosened" .

The late, great Smokey Yunick often said that this or that poor engine building practice or tuning mistake would result in running over one's own crank.

 

[EdStainless]

We didn't have room to have enough thread engagement for using high strength fasteners torqued to yield like they do in engines. And we were fully submerged in 400-500F oil. and we didn't have access for maintenance for years on end, until something broke.
I have seen many 2-bolt main bearing caps fail. If it happens at high RPM the crank often ejects out the bottom.

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P.E. Metallurgy, consulting work welcomed