69 Correct nut to attach wiper door asm re-enforcement

[Jack O.]

From the attached image, anyone know which nut is correct for attaching the re-enforement? The lower smaller one is what I recently purchased but I removed a few of the middle ones from the car so I'm thinking the middle one is original (which I can't find reproduced ).

[Terry M.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

From the attached image, anyone know which nut is correct for attaching the re-enforement? The lower smaller one is what I recently purchased but I removed a few of the middle ones from the car so I'm thinking the middle one is original (which I can't find reproduced ).

You are correct. The middle one is correct. Try Richard Fortier or David Slocowski (my spelling may be off on those names). Be sure to add the sealing gasket between that reinforcement and the fiberglass it attaches to.

[Leif A.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Jack,
What size is that nut? The '63-'67 outer heater box with A/C used a nut that is very similar in appearance and may be the same.

https://www.paragoncorvette.com/p-352729-heater-box-flange-nut-kit.aspx

[Joseph A.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

The correct nut is cad/zinc plated and has a rotating washer attached to it. It is the same nut used to attach the radio to the radio support bracket in U69/A2 #12 AMK sells them 8 for $4 as B-13507. In your picture it the one on the right.

[Terry M.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

The correct nut is cad/zinc plated and has a rotating washer attached to it. It is the same nut used to attach the radio to the radio support bracket in U69/A2 #12 AMK sells them 8 for $4 as B-13507. In your picture it the one on the right.

Joe
I don't see the washer on the right hand nut in Jack's picture. It could be either my eyesight or the internet photo quality or it just ain't there..

[Joseph A.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Here is the nut, as you can see the washer barely extend past the nut as in the one on the right in the supplied choices.

P1010781.jpgP1010782.jpg

[Jack O.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

The lower nut in my picture is the AMK nut, a keps washer 10-24 nut. The AMK and paragon nuts are smaller diameter than what I believe is the original - the middle nut in my picture - roughly 5/16 vs. 9/16.

[Terry M.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

The lower nut in my picture is the AMK nut, a keps washer 10-24 nut. The AMK and paragon nuts are smaller diameter than what I believe is the original - the middle nut in my picture - roughly 5/16 vs. 9/16.

Jack
I had to get a picture. With a lot of help from my friends and apologies to the Beatles. This is from a 1971, but I believe they were the same from 1968 until the end of the wiper door.

20210913_134930.jpg

My source tells me: "It's a #10-24 nut, .370 across the flats. (3/8") The integral washer is .032 thick, .670 diameter. The #10 stud is 0.90" long. GM #3759924"
Terry

[Leif A.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Joseph and Terry,
I concur. AMK has them in stock.

Keps Nuts - Conical & External

10-24 CONI KEPS NUTS .45 D CAD. 8 pk

.0002" Cadmium & Wax

(KNX) 3759924

B-13507

[Jack O.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Thanks so much for the effort Terry! Do you happen to know if anyone provides the "caulk" behind the re-enforcement.

[Jack O.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Hi Leif,

I have these from AMK but the washer is slightly smaller diameter than the originals.

[Terry M.]

Re: 69 Correct nut to attach wiper door asm re-enforcement

Thanks so much for the effort Terry! Do you happen to know if anyone provides the "caulk" behind the re-enforcement.

I am not aware of a source for an exact duplicate of the sealant behind that plate, but roofing felt - the thickest you can get - would be a reasonable facsimile. A little work with a hot air gun should blend them in. You can also depend on engine heat to mold them - especially if you have a big block. I often see the gasket neatly trimmed to the retaining plate. That would not be TFP.

[Jack O.]

Thanks Terry - NM

Thanks Terry - NM

[Edward J.]

Re: Thanks Terry - NM

Jack why not use some 3M strip chalk? It should squeeze out when you tighten like the factory stuff.

[Gary B.]

Re: Thanks Terry - NM

The wrap used on the upper aluminum AC line, to hold the bulb in place, is a good substitute. Cut it to the proper dimesions, square, and it will squeze out around the edges like the original. I bought a Delco roll of the stuff years ago, but it also available atmost good parts houses. And Autozone and such places are not considered :-) It's a cork impregnated material, but a touch up with a large black magic marker, makes it look much gooder.

The original was a solid black material, almost a butyl substance. I've not found anything that matches it yet. You might take strip caulk, lay it out in a square, roll it down into a flat square, see if it works.

Gary B