Postby FI Spyder » 18 Apr 2017 15:57
There are special sockets you can get to remove rounded bolt heads. The harder they turn the tighter they grip. You don't want to turn it so hard you break it off. Patience is key. All though this is likely due to dissimilar metals I harken back to the time I was removing my seats. The first 7 bolts came out looking like brand new from the factory. The 8th was rusted in. Why that one on a no rust car was an anomaly, like some one split coke on it and the acid started the rusting process. I was determined not to break it off regardless how long it took. Soaking it in penetrating oil and letting it sit for 20 minutes to an hour while I did other things, it took me a full week working it back and forth before it came out. A electrolytic seize can be more problematic. I saw a head stud that was so bonded to a head that the aluminum in the head swirled around the stud under the pressure of removal.
With limited space it may have to be removed (or at least transmission dropped a little to get more purchase). An air ratchet might aid you in providing some vibration to help break it free. That's all I got off the top of my head.
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