I've had a heck of time getting the king pins out of my 57 3100. Over the course of several weeks I tried various types of penetrant with no luck. The k-pins were stuck in the axle so hard that my punch/drift shattered or bent when I tried beating them out. I even tried a solid 3/4 inch steel bar which mushroomed on the end where I was beating it. Those pins did not want to come out and I did not want to heat the axle.
Before I took them to a machine shop to have them pressed out I decided to give PB-Blaster a try. For a week I shot them every night and let them soak. This morning I was able to drive the old king pins out using a smaller diameter king pin that I removed on an earlier project. Took abut 15 minutes a side. Of course I did a victory shuffle across the garage to celebrate.
Seems to be good stuff.
