Firewall rivet nuts

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Duster Dennis

Duster Dennis

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While doing some tidying up on my firewall and removing my voltage regulator I noticed only 1 of the 2 mounting holes on the firewall had a threaded rivet install.

Question
1. should I have two threaded rivet nuts for both?
2. It appears to be 10-24, this correct.
 
On my 68 and 69 cuda those are sheet metal screws. My 68 has a stock screw and one screw that is a size larger. All it takes is one over zealous mechanic to strip those holes. So that's why my screws don't match.
Looks like you have a Duster but I'd guess the rivnut was added to fix a stripped hole.
 
KosmicKuda said:
On my 68 and 69 cuda those are sheet metal screws. My 68 has a stock screw and one screw that is a size larger. All it takes is one over zealous mechanic to strip those holes. So that's why my screws don't match.
Looks like you have a Duster but I'd guess the rivnut was added to fix a stripped hole.
Click to expand...

Yeah, I have a 71 340 car. I am shocked someone went thru the trouble of installing a rivet nuts so I was assuming that was original. Being 1 hole with a sheet metal screw and 1 hole with a rivet nut I figured something was buggered having two different pieces of hardware.
 
I would have 2 riv-nuts. The sheet metal screws provide a poor ground path and can cause overcharging issues.
 
When I redo any auto stuff,I use nutserts/rivet nuts when possible.
Makes for better fastening and grounding.
 
We use Nutsert brand at work. You can "rig" an install tool. You need a high quality "best" is likely allen drive cap screw, a spacer which you can make out of a nut and some washers. Oil threads, hold the spacer with a wrench and drive it in. You need to watch material thickness vs nutsert length.

I'm not to certain, tho, of long-term grounding integrity. "They could rust" between the insert and firewall.

Frankly, the "old school" method of grounding using the mounting, whether a VR, ignition box, or lamp sockets, was damn poor design
 
67Dart273 said:
We use Nutsert brand at work. You can "rig" an install tool. You need a high quality "best" is likely allen drive cap screw, a spacer which you can make out of a nut and some washers. Oil threads, hold the spacer with a wrench and drive it in. You need to watch material thickness vs nutsert length.

I'm not to certain, tho, of long-term grounding integrity. "They could rust" between the insert and firewall.

Frankly, the "old school" method of grounding using the mounting, whether a VR, ignition box, or lamp sockets, was damn poor design
Click to expand...

I guess you could coat the rivet nut with dielectric grease.

I didn't realize they had rivet nus 50 years ago, they should have also used one for the resistor as well .
This one missing nut just caused me to spend $75 :(
 
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