If all of that fails, try a miniature butain torch aimed at the part of the block were the bolt threads into. Try heating around as much of the area as u can, moving bak&forth to heat evenly, do this may take 3to5 minutes. To ckeck temp i lick finger real good then touch area 1to2" away frm where i heated. If u get a sizzle, then its hot enough 4 an attempt. I found butain works better than propane, but not as good as oxy-acataline. These lil butains are also great 4 breaking bleader screws loose. Dont pretend its hot enough and make shure wires&combustables r outta the way. A buddy on fire watch, also hehpful. PS. If head of bolt is boogered up & wont grab frm thoes pliars, u can weld a socket or wrench 2 the head & proceed frm there. No weilder? Epoxy
SOURCE: can't get starter bolts loose to change starter
Hi blondie-68, They can be a little hard to break loose for sure,I am certain you know they are right hand thread, if you can using a flat punch or bar tap the head of the bolt a few times and try to break them again, if you can manipulate a snipe of some sort onto your wrench or ratchet this will give you the extra leverage required,could also try an air ratchet if you have one and if it will fit, just one of those annoying little jobs but with a little persistance you will succeed :) good like let me know how you make out take care
SOURCE: Battery Bolt Wont Come Off
PB blaster will cut corrosion better than wd-40 try that. If all else fails put a pipe on the end of the ratchet and turn.
SOURCE: How to removing starter from 1994 mercury sable?
I'm sure they are just stuck on there real tight. They get weathered under the car, and rusty. I don't think you would get them confused with the other parts. The best bolt breaker I have ever used is PB BREAKER . This can will make every bolt easier to get off like no other solution out there. Give it at least 1 hour. If it is still stuck, spray again and wait. It will work. Also, alternate between a breaker bar, and an impact wrench if you have them. Don't stress the wrench so it breaks or strip the bolt, it will loosen with repetition. I have not had 1 bolt stuck since I discovered PB BREAKER.
Good Luck!
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