Clamp the pin in a big vise then twist a little and pull hard.
What engine is it, some pins were not meant to come out.
Gif
There are less expensive ones out there but here’s the concept of a dowel pin puller tool.
http://store.snapon.com/Dowel-Pin-Puller-Sets-Set-Metric-Dowel-Pin-Puller-11-pcs-6-mm-thru-16-mm–P635477.aspx
Giff, it’s a Leopard. The penetrating mixture didn’t loosen them so I put the cases together today without touching the case’s mating surfaces up on my granite block.
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