Strokermjcomanche Posted April 12, 2015 Share Posted April 12, 2015 89 xj 4.0 My friend was changing his water pump on his 4.0 . In the process of taking the water pump mounting bolts out he broke 2 of them off with 3/8 to 1/2 inch of the bolt still sticking out of the block . I went over to his house after work and was able to get one of the bolts out with a pair of vise grips and a bernzomatic but the bottom one will not budge at all . I drained the antifreeze that was at the bottom of the block so I could get the bottom bolt heated without the antifreeze fighting the heat . What have you guys done to get them out ? I'd rather not drill and tap a hole if I don't have to . Thanks in advance . Link to comment Share on other sites More sharing options...
shelbyluvv Posted April 12, 2015 Share Posted April 12, 2015 Weld a nut to the bolt and it will come right out. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted April 12, 2015 Author Share Posted April 12, 2015 Wish I had a welder handy . That being said it's over at his house with no garage . Thank you . Link to comment Share on other sites More sharing options...
Dillithium Posted April 12, 2015 Share Posted April 12, 2015 If it's still sticking out, cut a slot into it wide enough to fit a slotted screwdriver. Then try an impact screwdriver or a screwdriver with a hex bolster on it for more torque., Link to comment Share on other sites More sharing options...
cruiser54 Posted April 12, 2015 Share Posted April 12, 2015 Heat it cherry red and let it cool 3 times. Or, try that Freezing penetrating oil that's out now. Works pretty good. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted April 12, 2015 Author Share Posted April 12, 2015 Heat it cherry red and let it cool 3 times. Or, try that Freezing penetrating oil that's out now. Works pretty good. I was going to heat the crap out of the bottom bolt , but figured I'd ruin the mounting surface for the pump or even crack the block . Is that a possibility? Link to comment Share on other sites More sharing options...
cruiser54 Posted April 12, 2015 Share Posted April 12, 2015 Heat just the bolt. Link to comment Share on other sites More sharing options...
ScottJeep Posted April 12, 2015 Share Posted April 12, 2015 Heat......penatrante ( of our choice or availability ) repeatedly. If you can still get nut(s) two would be nice with no welder available. Vise-grips slowly bite away what's left. We are all are saying we've been there. This is also when some HUGE amounts of patience pays off. This is normally my failure. BUT twice now I have worked out broken exhaust bolts at the back 4.0 heads by using penetrate and taping back and forth with a small punch & hammer. GOOD LUCK! Link to comment Share on other sites More sharing options...
reubj Posted April 12, 2015 Share Posted April 12, 2015 Heating the bolt cherry red and melting paraffin will sometimes work. The heat will draw the melted paraffin down into the seized threads. Link to comment Share on other sites More sharing options...
cruiser54 Posted April 13, 2015 Share Posted April 13, 2015 Heating the bolt cherry red and melting paraffin will sometimes work. The heat will draw the melted paraffin down into the seized threads. That's a good old fashioned trick. Link to comment Share on other sites More sharing options...
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