You probably don't need to change the pins, just the bushings (unless you let the bushings wear through to the pins). If you need to replace the pins (or bushings), first you need a stool or crate (to set the door on) or someone to help you, since the door is surprisingly heavy. Next, hammer a tap (or a Flathead screwdriver) onto the bottom of the pin until it is free (falls out). You may need a Flathead screwdriver or chisel to pry the bushings out of the hole Replace the pin and bushings. Check the pins for wear, and if there is none, put them back. It seems like an ordeal, but it is actually pretty mechanical and simple.
Replace the hinge pins and bushings.
http://www.bodyshopzone.com/archives/mechanical/door/hinge/pin_replace_1.html
How do you change the door hinge pins and bushings on a 2002 GMC 1500 pickup truck?"
Lower ball joints wear out early. Door hinge pins and bushings wear out early. Idler arm and pitman arm joints wear out early.
You replace The hinge pins
My advice based on experience is to replace the entire hinge assembly.
go to youtube.com
Because the hinges are welded in place, replacing the hinge pins and bushings should restore the door back to original position.
there is a bushing kit you can get because the pins don't go, the bushings do. all you need is a hammer, regular screwdriver, and some white lithium grease so it doesn't happen again you can buy these at any parts store and come with the bushings and pins
You can change the skin. Japan's, on your Oldsmobile automobile, by propping the door up, so it cannot fall. Pound the inch pins out with a chisel and hammer.
I would recommend you replace the entire hinge and forget about repairing it. In my experience this is the best route to take.
The old door hinge pins have to be cut out with a torch on a 1989 F-150. Then, new hinge pins can be welded into place. This part might be available at an automotive salvage yard for a fraction of the cost of new hinges.