['ol Pinion head]

Had an instance near 25 years ago where was in a monster country yard & trying to pull a "138" cast wp core that dated one of my keeper '71's. Had been been looking for near a decade for a "138" core in that date range to rebuild so was very happy. Get nerly all the bolts out & the loop ring TC bolt would not budge. Removed the radiator & fanshroud. With lot of room, whacked the bolt dead square with my BFH. Had the 6 point on the long flex head 1/2" ratchet. Wouldn't budge. Ended up slipping the clutch fan back on the wp studs, put the radiator back in, & carefully walked the hood down.

Month later, am on a long road trip & back in same monster yard w my Cherokee. Brought the alum bottle small cutting torch rig. Also several pump up water sprayers, just in case. It took getting the long bolt hot, let it cool, then finally was able to get the threads to break loose with the break over. Ended up buying the excellent condition original timing cover as well.

Have also had occasions pulling wp cores to rebuild, where I broke off the bolt head of the same position 9/16" headed long bolt. By carefully twisting the core water pump back & forth was able to get the core off w/o damage.