66 Alternator bolt; lower, outer position, threads into exhaust manifold

[Joe L.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

David,

This is what AMK shows for their repro of GM 179839:

[ATTACH=CONFIG]106237[/ATTACH]

I think the white circle near the tip of the bolt is a plastic insert that serves as a locking feature.

Gary

Gary------


I don't think that type of locking feature would have been used on a bolt that threads into the exhaust manifold.

[Dan D.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

Gary,

I have a 3/8-16 x 1" bolt. Grade 5, TR head marking, plain. You are welcome to it if you want. It is older than dirt, so it must be original, out of something. It is rust free because I went through my bolt collection a few years back and chased all the threads (not a thread cutting die), cleaned them, and then coated them with a few snorts of WD40 mixed in a tray of gasoline. When the gas evaporated it left a slightly shinny film on the bolts, and none have rusted since. Must have done 500 or more of them, plus washers and nuts. Quite a project, but the results are well worth the effort.

The bolt you show with the nylon plug is a locking bolt, but not for exhaust manifolds. 500* heat would dissolve it.


-Dan-

[Dan D.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

From my previous post. Pics did not transfer for some reason.

Bolt Collection. Photos are not very good.


20210516_130456.jpg




20210516_131113.jpg20210516_131248.jpg

-Dan-

[Gary B.]

gsb1966@comcast.net.

All I can say about your fastener inventory and storage is WOW!

Gary

[Richard M.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

Dan, Wow, nice work on those. Nice offer to Gary too. Glad you found one for him. I found several 7/16"x1" in my pile but no 3/8"x1", albeit some rusty 1 1/4" ones.

The bag that held the 7/16"x1" bolts was handwritten, by me.... DIFF TO XMEMBER. Interesting all 4 had different head markings.
0516211100.jpg
0516211102_Burst01.jpg

I wonder if that AMK with the angled H headmark white "feature" is actually a hole for a cotter pin or facsimile.

Rich

[Gary B.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

I wonder if that AMK with the angled H headmark white "feature" is actually a hole for a cotter pin or facsimile.

I wondered that as well. I just guessed that it was plastic filled.

Gary

[Dan D.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

I see what you mean with the hole. I thought it looked liked a nylon plug, but after looking closer, its hard to tell.

But I can't imagine any manufacturer making a hole that large. That would really weaken the bolt. Is it possible that someone drilled it?

-Dan-

[Dan D.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

Gary, Rich,

Thanks for the kind words about my bolt/nut collection.

Actually, what it was all about is my hardware collection started in about 1955, when I was just a kid and didn't even know what a Corvette was. But even at that tender age I was messing with cars, mechanical stuff, and electronics, and I kept everything. Didn't throw out anything.

But the collection was totally non-organized, and did nothing except grow over the following 60 or so years. It was all but impossible to find anything in it, so at some point I decided that I had to fix it. It turned out to be a full 3 day job, which I documented with some photos. One day, after cleaning grunge on the wire wheel for several hours, Wiffie came out, took one look at me, and said there was no way I was going to use her shower or washing machine looking like that. I had an old t-shirt on that was totally black, and I looked like I was black faced. She was not at all happy, but my marriage survived.

Actually, my plan was to present it at one of our local chapter technical presentations, but our chapter dissolved before that happened.

O-well, I still have my bolts and nuts and stuff, and I use it all the while.

-Dan-

[Gary B.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold


Gary

[David B.]

Re: 66 Alternator bolt; lower, outer position, threads into exhaust manifold

If AMK shows that as their GM 179839 I would begin to question their reliability source.
To further define: 179839 is 3/8-16 x 1 plain GM 280-M class 2A thread (GM 280-M are grade 5).

[Gary B.]