Lonny B.,
What KENtuckyKEN says is true.
A quick story: Years ago, I was working on a truck engine block that had a broken off bolt in the casting. I thought about trying to drill it and use an EZ out to extract it, but it was in a tough location to drill. So, not wanting to ruin the block, I requested the advise of an older-than-me fella friend whom was a machine repairman forever
. He told me, "YEAH,,,,Bring it over and for a bottle of Rum, I'll show ya how to get that stub outta there."
Basically, what he did/said to do is to heat the pin or bolt, not the casting it's stuck in... In that way, the pin expands with the heat and SHOULD somewhat "crush the crud" that's between the two parts and then as soon as it's hot, but not hot enough to start to transfer heat into the casting, dribble some penetrating oil onto the parting line, allowing it to be pulled into & between the two parts, then lightly tap on the bolt stub. The tapping will encourage the penetrating oil to seep in... Yeah, it'll smoke a bit and maybe even flame, just blow the flame out and put some more oil on it. As soon as the oil stops bubbling from the heat, turn the bolt stub (or in your case, tap on the pin). If it still doesn't move after 5 minutes of effort, apply a bit more penetrating oil & leave it for at least 2-hrs to allow ALL the heat to dissipate out of the parts. Then start over & repeat. Many times it'll take two or three attempts before it'll come out.
As KENtuckyKEN pointed out, there WILL BE some pins/bolts that simply work come out - as sometimes they're just too badly worn and there isn't any saving them
. Never-the-less, I have used this procedure many times with success...
Keep us posted on your progress!
Good Luck!
Ryan W