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Author Topic: Correct Horn Fasteners  (Read 2467 times)
sixt9x33rs
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« on: December 23, 2011, 10:43:42 PM »

The AIM is not real clear (to me anyway) regarding the type of fastener used to hold the horn to the latch assembly. I went with the 9780422 fastener as shown in the AMK catalog. This fastener is widely used on the radiator support and elsewhere regarding sheetmetal. But while scavaging the junk yard yesterday I ran across two Impalas, one a 67 and one a 68. Both examples were very much in tact. I noticed that both fasteners holding the horns to the car were 9/16" AF with a captured washer with small serrations on the inside of the washer. These fasteners were zinc or cadmium covered not black phosphate like the 9780422 fastener. The zinc fastener has the pointed end like the previous mentioned fastener and was also .75"...I think. Anyway if someone knows the correct fastener I would like to see a picture.

Thanks,

Lawrence
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'69 RS Z/28 Olympic Gold, 711
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KevinW
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« Reply #1 on: December 24, 2011, 08:58:27 AM »

I am pretty sure the serrated ones are correct for 69 at least.  The horn grounds through that bolt and the serrations had to bite past the paint to bare metal.
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Mike S
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« Reply #2 on: December 24, 2011, 09:46:17 AM »


Hello,

 I checked mine on a 67 LOS (original) and NOR (restored) horn assemblies and they both use the pointed cad plated serrated fasteners. That is for 67 though and I would assume that would follow through to 69 and beyond being a horn is a safety item which I believe is the reason they are plated and serrated.

Merry Christmas!
Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
sixt9x33rs
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« Reply #3 on: December 24, 2011, 11:40:38 AM »

Thanks guys!

Merry Christmas

Lawrence
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'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles
m22mike
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« Reply #4 on: December 24, 2011, 03:42:33 PM »

Lawrence
 I believe your observation on the 67 and 68 cars is spot on. I believe the zinc plated horn bolts were superceded to dark phosphate around the early run of  69 Cheverolets. That has just been my observation from looking at unmolested cars.
Most 69's hand very few zinc plated fasteners under the hood. Exceptions being some of the sheetmetal screws like VR, horn relay, ground straps, and washer bottle bracket hold down screws.
 I am not at home now and can not give you the page #'s and PN's now. But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.
 I had asked Steve Shauger this same question awhile back concerning horn bolts on 69 Camaros. I believe he told me that he had seen Zinc horn bolts on some early 69's only.
 Always take the time to soak in all the detail stuff on unrestored cars, not just Camaros.

Mike
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JohnZ
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« Reply #5 on: December 25, 2011, 01:36:47 PM »

But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.

That's correct - my original 02D car has the same bolts on the horns that attach the hood latch to the front of the radiator support.
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sixt9x33rs
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« Reply #6 on: December 25, 2011, 04:56:18 PM »

But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.
John aren't the Fasteners that hold the hood latch assembly to the radiator support all the same? All four Fasteners are the same right?
That's correct - my original 02D car has the same bolts on the horns that attach the hood latch to the front of the radiator support.
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'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles
paceme
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« Reply #7 on: January 16, 2012, 03:47:41 PM »

Lawrence
 I believe your observation on the 67 and 68 cars is spot on. I believe the zinc plated horn bolts were superceded to dark phosphate around the early run of  69 Cheverolets. That has just been my observation from looking at unmolested cars.
Most 69's hand very few zinc plated fasteners under the hood. Exceptions being some of the sheetmetal screws like VR, horn relay, ground straps, and washer bottle bracket hold down screws.
 I am not at home now and can not give you the page #'s and PN's now. But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.
 I had asked Steve Shauger this same question awhile back concerning horn bolts on 69 Camaros. I believe he told me that he had seen Zinc horn bolts on some early 69's only.
 Always take the time to soak in all the detail stuff on unrestored cars, not just Camaros.

Mike

Hey Mike, I just inspected a 10C of 68 car and it had the zinc plated horn bolts with serated washer.
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Steve Shauger
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m22mike
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« Reply #8 on: January 16, 2012, 07:09:26 PM »

That's neat, thanks Steve.

Mike
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JohnZ
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« Reply #9 on: January 17, 2012, 11:31:46 AM »

But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.
John aren't the Fasteners that hold the hood latch assembly to the radiator support all the same? All four Fasteners are the same right?
That's correct - my original 02D car has the same bolts on the horns that attach the hood latch to the front of the radiator support.

All of the hood latch support bolts are #3960314, including the bolt for the R.H. horn; the L.H. horn used #3846202. All are black phosphate.
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paceme
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« Reply #10 on: January 17, 2012, 09:19:31 PM »

But in my two coppies of the 69 Camaro Assembly manual where it shows one of the horns and bolt detail, there is a revision to that bolt, dated I believe 10/68. In the lower revision box on that page it states the # of the zinc fastener and the word "Was". I believe on Camaros they started using the same dark phosphate bolt that holds the lower hood latch to the core support and header. Not serated, and with a captured washer.
John aren't the Fasteners that hold the hood latch assembly to the radiator support all the same? All four Fasteners are the same right?
That's correct - my original 02D car has the same bolts on the horns that attach the hood latch to the front of the radiator support.

All of the hood latch support bolts are #3960314, including the bolt for the R.H. horn; the L.H. horn used #3846202. All are black phosphate.

I respectfully disagree, because I have 5 documented cars (4 unrestored and one needing restoration), all produced from 9B to 10C (of 68) that were built with the horns secured with zinc plated bolts with serrated washers. My point to Mike was that 10c is the lastest built car I have found . Just an FYI, but all examples were built at Norwood.
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Steve Shauger
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68camaroz28
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« Reply #11 on: January 17, 2012, 10:26:14 PM »

This is one of the horn bolts on our 01B 68 Camaro and it is zinc.

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Chick
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paceme
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« Reply #12 on: January 17, 2012, 10:53:34 PM »

Chick, that is what I have seen on the examples I referenced in my previous post. The head marking is typical of what I have seen on the zinc bolts. Thanks for posting.
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Steve Shauger
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IZRSSS
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« Reply #13 on: January 18, 2012, 10:17:14 AM »

Steve/Chick - Is this the same horn fastener that was used for 69's or at least early build 69's? This is the same one I have on mine.

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69Z28-RS
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« Reply #14 on: January 18, 2012, 12:43:19 PM »

I've been following these threads on fasteners pretty carefully because my original '69 Z28/RS (late 09C build) was apparently in a minor front end fender bender early in it's life (not the greatest repair, as I believe all the original fasteners were put back on, but not *necessarily* in the same locations they came from... Smiley    I know it was in an accident because when I purchased it in '76, the lower valence had a GM pn sticker on it's backside, and there's a small amount of fbody iller in the front portion of the hood.   It's difficult for any of us to know (unless we owned our cars from new) and even then we might have even *forgotten* about minor repairs performed 40 yrs ago... so going by what is on our cars is not as *robust* a method as what the AIM shows...
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