Correct screw size/thread Part no 159612 ? Horn contact screw to hub

[Gerard F.]

Can anyone look up the screw size with the part number above from the 67 AIM. Many years age, I replaced these screws with replacement screws from one of those complete interior sets.

One of these screws is now stripped out and loose, which may be a part of my intermittent horn blowing problem. 67 standard steering column.

[Joe L.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Can anyone look up the screw size with the part number above from the 67 AIM. Many years age, I replaced these screws with replacement screws from one of those complete interior sets.

One of these screws is now stripped out and loose, which may be a part of my intermittent horn blowing problem. 67 standard steering column.

Jerry-----


GM #159612 was a pan head screw of thread size 8-32 and length of 5/8". A replacement for it was available until recently under GM #9438173. The only difference was that the original was phillips head whereas the replacement was torx head. It's discontinued now, anyway.

[Timothy B.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Jerry,

Try the home depot because some of the stores have sem screws and you an find phillips head with attached serrated washer screws 1/2" long in the 8-32 size.

Also, locate a heli-coil 8-32 set and fix your hub, it will be good as new, you may be able to borrow one from a machine shop or just buy one on line.

[Gerard F.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Jerry,

Try the home depot because some of the stores have sem screws and you an find phillips head with attached serrated washer screws 1/2" long in the 8-32 size.

Also, locate a heli-coil 8-32 set and fix your hub, it will be good as new, you may be able to borrow one from a machine shop or just buy one on line.

Tim,

Wondering if I should just tap it to a 10-24 size. What do you think?

[Timothy B.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Hi Jerry,

If you tap it to the next size how big will the screw head be compared to the 8-32 screw as that may cause interference somewhere. Also, the hole size (drill) before installing the heli-coil may be too big against the outside of the hub area not leaving enough meat there.

I just recently fixed one on my 63 steering hub using 8-32 heli-coil and it worked fine. The biggest issue is finding a 8-32 heli-coil but they make one.

[Gerard F.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Tim,

There isn't much meat around the screw hole in the hub. I found that the easiest and least destructive way to repair the threads was to tap the hole to a 10-32 thread and use a pan headed 10-32 X1/2" SS screw. See photos:






See the thread on my horn problems for the rest of my activities this afternoon.

Having fun,

[Timothy B.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

That looks good Jerry, if the screw heads don't provide a problem it's a good repair. Do you think that was the horn problem or is the car possessed. :-)

[Richard M.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Jerry, that bigger screw doesn't interfere with the horn button, does it? If it's okay....you nailed it. Good.

Rich

p.s. Your other thread for future reference searches is here......
https://www.forums.ncrs.org/showthre...-Horn-Problems

[Gerard F.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Tim,

The only thing possessed on the car is that darn replacement signal switch. I have been through 3 so far. When this switch goes, I'll be putting my repaired original back on with the original lever screw.




Note that the original screw in the pic looks like it is a self threading or self locking screw and you don't need the lock washers with it. It doesn't work on any of the replacement switches I've seen, just too long.


At the end of this month, I will have had the car for 45 years. Here's my transfer paperwork:



The sum of the check and the loan was what I paid for the car. My Navy roommate was getting married and his wife to be told him to "Get rid of the Vette and get a nice family car".

[Gerard F.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Rich,

The #10 horn contact screw in place of the #8 doesn't interfere at all with the horn button. In the picture above, only the lower screw was changed to #10, the two upper ones are replacement #8's, you can seen the difference.

In fact with the new cancelling cam, the horn button is a lot more springier and seems to sit out further. I did the standard ops test of hitting the four quadrants and the horn button operates like new.
I think the key to the repair was the new cancelling cam. I guess the original cancelling cam just wore out after 46 years.

[Ralph E.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Jerry, Interesting that you bought the car 12/27/68 and didn't have to make payments until 3/1/69. How did you manage that one?

[Gerard F.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Ralphie,

Actually, I think that was normal in those days with the NFCU. Can you imagine a car loan payment of $105.68 over 36 months, for a 67 Corvette (although a year and a half old when I got it).

[Joe L.]

Re: Correct screw size/thread Part no 159612 ? Horn contact screw to hub

Ralphie,

Actually, I think that was normal in those days with the NFCU. Can you imagine a car loan payment of $105.68 over 36 months, for a 67 Corvette (although a year and a half old when I got it).

Jerry------


$105.68 in 1967 was the same as $738.96 today.