[Dees67]

Has anyone bought a new power steering ram from NPD lately? I went
to install mine on my '67 and found that the 5/8" castle nut would only thread
onto the ball stud about 1-1/2 turns before bogging down. The threads are
not damaged, the nut is not cross-threaded, and the ball stud is not metric.

I'm going to try to run a die over the ball stud in case the threads are maybe
not deep enough, but I was wondering if anyone else has had similar problems?


Rich
'67 C-code Convertible (Dees67)
'69 GT Sportsroof (project car)

 

[camachinist]

Run a tap through the nut first....

Are those 7/16"20TPI or are they some NS thread?

Ball studs are usually hardened steel and the threads will likely be a bit tough to use a die on....

IMO, check the nut first....

Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg

 

[Dees67]

I think the nut's ok. I tried the new nut on the two old cylinders I have and it threaded
on just fine. I tried the two old nuts I have from those cylinders on the new cylinder and
they had the same problem - wouldn't thread correctly.

I can't recall the dimension now - 7/16 sounds about right. It's got the "fine" thread pitch
(as opposed to "coarse" - the only two choices available to me at the hardware store).

Given that the stud is hardened, it's probably going to want to spin in its socket once
the die starts to bite. Hmmm... this is getting to be a real problem...

Rich
'67 C-code Convertible (Dees67)
'69 GT Sportsroof (project car)

 

[Guest]

If running the die down the stud doesnt work get hold of a thread restoring file.You should be able to see where the thread is damaged and then dress the damaged area with the file

Greg B

 

[Scott302]

Correct thread size is 9/16-18 (pn# 34033-S). I checked some from inventory and they match. Let me know what you find out.
Scott

National Parts Depot
1965 Conv:Street driven concours
1966 Coupe: Daily driver and toy

 

[Dees67]

(Thanks for being proactive Scott! It was a pleasant surprise to see your reply here...)

Problem solved. Although I couldn't thread the nut on by hand, I decided to give it
a careful try with a wrench. I vise-gripped the base of the ball stud and used a little
mystery oil on the threads and started wrenching it on with a flare nut wrench. It
gave some resistance, but it was smooth and steady (which is actually desirable
for a critical part like this) and the new nut threaded on just fine.

"The question is not whether you're paranoid, it's whether you're paranoid enough!"

Thanks for the help guys...

Rich
'67 C-code 'vert (Dees67)
'69 GT FB (project car)
Check out my band http://www.brickyardblues.com