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Jul 21st, 2025 | | | | Joined: Sep 2016 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2016 Posts: 38 | Found a replacement hood for my 59 truck, only thing is one one the hinge mounting holes is wallowed out... Tried chasing it with a tap but it will not hold the bolt... Is there enough meat there to helicoil or should I try to weld it , drill and re-tap? | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Use a thread repair method called a "Riv-Nut" It fits into a hole drilled oversize and is installed with a plier-type tool similar to a pop riveter. Harbor Freight, Northern Tool, and similar places sell then, plus they're available on Ebay. It's a quick, easy, and permanent fix.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2016 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2016 Posts: 38 | | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | Depends on thickness, helicoil for thicker, riv-nut for thin stuff. | | | | | Joined: Oct 2015 Posts: 338 Shop Shark | | Shop Shark Joined: Oct 2015 Posts: 338 | Heli coil would do a good job for sure but maybe you could go one size bigger bolt? Or try tapping a fine thread same size bolt? Maybe a metric bolt is just a tiny bit larger and tapping it would provide a solution? | | | | | Joined: Sep 2016 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2016 Posts: 38 | Thanks for all the suggestions...will dig in tomorrow | | | | | Joined: Jul 2000 Posts: 2,115 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,115 | How did you make out with this problem? I have the same issue. It looks to me that the riv-nuts are 5/6-18 NC thread, but the special hood bolts are 5/16-24 NF threads. 
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Sep 2016 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2016 Posts: 38 | I'm sorry Gord, I dug in alright but since I didn't have time to get by Northern, I jumped on the clutch.... I will check but I could swear the hinge bolts on my 59 were 5/16 x18... Very possible I'm mistaken...I'm a woodworker not a mechanic! Will post how it works out... Good luck on yours | | | | | Joined: Sep 2016 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2016 Posts: 38 | Pegasus auto racing has 5/16-24 rivnut and an economy insert tool in case you only have a few to do | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | The installation tool isn't really a necessity- - - -just use a bolt, nut, and flat washer to install the riv-nut. Anything to squeeze the rivet section out against the hole works- - - -the plier tool just makes it quicker to install a bunch of 'em.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2000 Posts: 2,115 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,115 | Thanks. I see that Fastenal has them - but maybe not at my local store. I hope they can get some for me without having to order a thousand or something...
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Nov 2011 Posts: 1,608 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 1,608 | I am not sure about your particular situation, but one of these plug welded to the sheetmetal may work for you if the riv-nut doesn't. http://www.mcmaster.com/#weld-nuts/=14e3mzn | | |
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