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Old December 2nd, 2007, 08:12 PM   #1
Countrygirl21
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Default Need Help With 4.0 Motor Mount Bolts

My brother has a 95 Cherokee with a 4.0 all the bolts that mount to the block snapped off on passnger side. Any tips on how to get them out without screwing up the whole motor. Thanks-
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Old December 2nd, 2007, 08:16 PM   #2
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Weld a nut to the heads.
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Old December 2nd, 2007, 09:03 PM   #3
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Quote:
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Weld a nut to the heads.
X2. Using a screw extractor might screw you. They can break off.

I think that problem happens when motor mount bolts loosen up and you don't realize it. They get bent abck and forth till they break off clean.
This happened to me and I was luck enough to get some vise grips on the bolt. They came right out pretty easily.
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Old December 3rd, 2007, 06:18 AM   #4
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Quote:
Originally Posted by Rob the plumber View Post
X2. Using a screw extractor might screw you. They can break off.

I think that problem happens when motor mount bolts loosen up and you don't realize it. They get bent abck and forth till they break off clean.
This happened to me and I was luck enough to get some vise grips on the bolt. They came right out pretty easily.
I had this happen with my 94 Cherokee, and I was able to get them out with a screw extractor... I had a right-angle attachment for my cordless drill that I think that I could not do without.

Good luck.
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Old December 23rd, 2007, 10:50 PM   #5
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I have seen this several times. The bolt threads have locktite on them. Remove the braket from the motor mount. Take a die grinder with a cut off wheel and grind a little slot centered on the broken off piece of bolt. Try not to get into the block too much, but you will a little(not a big deal). After you get the slots cut into the broken off bolts, get out the torches and heat up the mounting boss on the block where the bolts are broken off into. The heat will soften the locktite and you will be able to spin out the broken pieces with a stubby flat blade screw driver.

It works, I have done it dozens of times when I worked at the Jeep dealer.

I think there was a bad batch of bolts that Jeep used. It was pretty common. The customer would come in complaining of a stange noise under the hood (fan chewing up the shroud).
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Old December 24th, 2007, 10:15 AM   #6
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If you're going to drill it out and use an extractor use a LH drill bit.
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Old December 24th, 2007, 10:26 AM   #7
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Whatever ya do to get them out hose them down a few times a day with some type of kreeping oil (pb blaster, kroil) for a couple days if you can. IMO bolt extractors are the weakest tool's on the planet. Ive broken almost as many extractors as bolts, and they are a bitch to get out after they snap..
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Old December 24th, 2007, 10:28 AM   #8
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Quote:
Originally Posted by greenjeep View Post
I have seen this several times. The bolt threads have locktite on them. Remove the braket from the motor mount. Take a die grinder with a cut off wheel and grind a little slot centered on the broken off piece of bolt. Try not to get into the block too much, but you will a little(not a big deal). After you get the slots cut into the broken off bolts, get out the torches and heat up the mounting boss on the block where the bolts are broken off into. The heat will soften the locktite and you will be able to spin out the broken pieces with a stubby flat blade screw driver.

It works, I have done it dozens of times when I worked at the Jeep dealer.

I think there was a bad batch of bolts that Jeep used. It was pretty common. The customer would come in complaining of a stange noise under the hood (fan chewing up the shroud).
x2 this works very well.my last choice would be to drill them
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Old December 24th, 2007, 08:18 PM   #9
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Ok.. Thanks for your help guys!
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