Steering arm bolt frozen between spindle and arm

[JustJohn]

Still working on my front brake upgrade and ran into a problem. I have one steering arm bolt frozen between the stock spindle and steering arm.
So far it's withstood a ball joint press and a 6 lb hammer. Hasn't budged. It's currently sitting in penetrating oil and loaded with the ball joint press.
I can live without the spindle since it's common and getting replaced anyway but are there any other ideas before I notch and crack the spindle boss to get this thing out?

[David Pozzi]

Heat with a torch & a strong impact wrench usually works for me. The impact wrench shakes loose the rust pretty well.

[JustJohn]

Oh....
The bolt head is already ground off. It was trashed and a socket wouldn't go over it. I made it halfway and was able to separate the spindle and steering arm. Now I just have a frozen stud through the part I need - the steering arm. At least now I can try rotating the free ends with vice grips. Failing that its now easy enough to manage that I can bring it in to work and use a really big press or machine it out.

[Ghiaguy]

World's greatest penetrating oil is a 50/50 mixture of ATF and acetone -- by far -- a million times better than anything else!!!!

grind it off smooth and start drilling it out a little bit at a time, takes a little time but worth it in the end

[Apogee]

I would think it would come with enough heat...you have a torch?

[JustJohn]

I have a torch.

No issues with material property changes on the cast part?

[JustJohn]

Got it. Heat and a slightly smaller hammer.

Needed to keep the arm intact. I no longer need the extra brake boss but it is essential to reinstalling the factory disc brakes.

[MonzaRacer]

Best over the counter penetrant hands down, Cyclo Breakaway,,,,, next best Kano Labs Aero Kroil or Kano Kroil.
Both work well but for my money the Cyclo is what I converted my shop to,,,, we used to use PB but I took in one can of Breakaway, and sold EVERYONE now we pay MORE for breakaway. Check your local Fastenal store.
And both don't STINK like most penetrants.