Shocks for 1994 F-150 2WD

[john112deere]

More'n likely, what the torch did was expand the two pieces at different rates, and that expansion broke the rust free. Even if it's not enough to break it free, it opens it up enough to get a little more penetrating oil in there, which is why I recommended the heat, PB Blaster, heat, PB, routine.

I've been known to heat the piece with the female threads in it with a torch while holding an ice cube on the head of a bolt to maximize the temperature difference...

 

[O'Rattlecan]

Ian, I used to think that the expansion and contraction were what did the trick. In this case, expansion would have made it worse, not better. The constrictive bushing would have gotten no heat, as it was shielded by the shock and rubber bushing. The only item that could get direct heat was the bolt, and it would have grown and created more friction.

I really think there's a chemical breakdown of Iron Oxide with the heat.

Ryan