1966 Clutch rod jam nuts

[Tony C.]

[Mike M.]

Re: 1966 Clutch rod jam nuts

i'd black phosphate them. think they may still be available from GM. mike

[Mike M.]

Re: 1966 Clutch rod jam nuts

i'd black phosphate them. think they may still be available from GM. mike

[John H.]

Re: 1966 Clutch rod jam nuts

Those jam nuts are the same nut used to secure the battery positive cable to the starter solenoid stud, and the nuts used on the bolts for the big-block rear stabilizer bar link ends to the bar and to the bracket on the trailing arm.

[John H.]

Re: 1966 Clutch rod jam nuts

Those jam nuts are the same nut used to secure the battery positive cable to the starter solenoid stud, and the nuts used on the bolts for the big-block rear stabilizer bar link ends to the bar and to the bracket on the trailing arm.

[Joe L.]

Re: 1966 Clutch rod jam nuts

Mike and Tony------

The original nuts, GM #124829, are still available from GM (for about 4 bucks, each). However, the GM finish spec for the nuts is zinc plated. It's possible that finish changed over time.

[Joe L.]

Re: 1966 Clutch rod jam nuts

Mike and Tony------

The original nuts, GM #124829, are still available from GM (for about 4 bucks, each). However, the GM finish spec for the nuts is zinc plated. It's possible that finish changed over time.

[John H.]

Re: 1966 Clutch rod jam nuts

Joe -

The '67 JG also calls them out as zinc-plated in the rear stabilizer bar link bolt applications.

[John H.]

Re: 1966 Clutch rod jam nuts

Joe -

The '67 JG also calls them out as zinc-plated in the rear stabilizer bar link bolt applications.

[Joe L.]

Re: 1966 Clutch rod jam nuts

John------

Yes, and I'm 100% sure that in the battery cable-to-solenoid application they were zinc plated. So, I'd guess they were all zinc plated.

I think I changed the ones on my car to standard thickness nuts years ago when I changed the clutch rod (either that, or they were always standard thickness). I don't recall what the originals were (assuming that the ones on it now are not original).

[Joe L.]

Re: 1966 Clutch rod jam nuts

John------

Yes, and I'm 100% sure that in the battery cable-to-solenoid application they were zinc plated. So, I'd guess they were all zinc plated.

I think I changed the ones on my car to standard thickness nuts years ago when I changed the clutch rod (either that, or they were always standard thickness). I don't recall what the originals were (assuming that the ones on it now are not original).

[Joe L.]

Addendum

One other thing: I can't figure out why they ever used the thin jam-style nut for the clutch rod application. In general, standard thickness nuts are used for "structural" applications except for special reasons (like clearance problems). There is no clearance problem with the clutch rod nuts. I would think that the extra thread engagement (and strength) provided by standard thickness nuts would be useful in the clutch rod application and no benefit, whatsoever, would be achieved by using jam nuts. That may be what I was thinking when I changed them (assuming that I did change them).

In general, jam nuts are used for "locking" purposes, not "structural". Of course, the battery cable application requires little strength and the thinner jam nut might be otherwise useful. So, I can understand why the jam nut was used there.

[Joe L.]

Addendum

One other thing: I can't figure out why they ever used the thin jam-style nut for the clutch rod application. In general, standard thickness nuts are used for "structural" applications except for special reasons (like clearance problems). There is no clearance problem with the clutch rod nuts. I would think that the extra thread engagement (and strength) provided by standard thickness nuts would be useful in the clutch rod application and no benefit, whatsoever, would be achieved by using jam nuts. That may be what I was thinking when I changed them (assuming that I did change them).

In general, jam nuts are used for "locking" purposes, not "structural". Of course, the battery cable application requires little strength and the thinner jam nut might be otherwise useful. So, I can understand why the jam nut was used there.

[Mike M.]

Re: Addendum

joe: i was told, years ago by a Bar Brother( crow, wreck and pry), that the nut thickness, once it exceeds the diameter of the bolt, is a waste of nut threads. now i'm here to tell ya, these Bar Brothers weren't MIT grads. what say ya? mike

[Mike M.]

Re: Addendum

joe: i was told, years ago by a Bar Brother( crow, wreck and pry), that the nut thickness, once it exceeds the diameter of the bolt, is a waste of nut threads. now i'm here to tell ya, these Bar Brothers weren't MIT grads. what say ya? mike