[ardoski14]

To remove the stuck zinc, cooler removal is probably necessary.  I would not rush into that however.  What I would do (and have in the past) is insert the new pencil zinc and take the boat for a ride.  If the engine is not running excessively hot, leave it be.  

I notice your home port is fresh water.  In salt water (my home port) I would replace the pencil zincs twice a year to prevent the anodes from breaking off.  Going forward, check the anodes every few months and replace as you wish.  

Bob

The old one is still in the hole to point barely any water drained out of the hole. Think I'm just going to pull the oil cooler off tomorrow and get it out. I definitely will be part of my seasonal maintenance plan.