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anarchy0392 03-02-2013 01:27 PM

Well I'm screwed the bolt for then engine mount broke a few days ago.Its the head that broke off and the threaded part is in the body. So I took it to a shop to have them get it out. They welded a nut to it 5 times drilled it an used a air hammer. Well to say the least no one can get it out. Its the bolt that holds the mount to the uni-body. So it looks like I'm gunna have to get a new car now cause when ever i give it any gas the whole engine jerks violently, shakes the whole car and my mpg is crap along with acceleration.

Anyone have any ideas before I end up getting rid of the car?

tmittelstaedt 03-02-2013 01:54 PM

Can you post a picture of the broken off bolt? Which mount? And in my opinion the shop didn't know what they were doing.

Welding a nut to a broken off bolt is an old trick but it generally only works on bolts that the heads were rounded off by incompetents using the wrong tools to get the bolt out.

If the bolt is jammed far enough in there that the head snapped off when a high amount of torque was applied, then a welded on nut will just snap off when the same torque is applied.

If the bolt has really become part of the unibody then a torch can be used to cut it out, then weld in a replacement sheet metal patch, drill a hole in the right place, then weld on a nut. This is trivial for a good body shop to do.

pasta 03-02-2013 03:37 PM

i agree ^^^^^

anarchy0392 03-02-2013 04:16 PM

jinstall 03-02-2013 04:51 PM

drill and tap.

anarchy0392 03-02-2013 04:55 PM

The shop tried to drill and tap. Apparently it broke a few of their drill bits.

coldbear 03-02-2013 05:33 PM

My Procedure.
Remove the mount so you can work on the bolt removal. After MM removal, find a stainless steel washer that will go over the bolt post, or whats left of the it. Find a stainless steel nut that will fit tightly "over" the bolt post. Now here's where the magic comes in. Find a new dry 3/16'' stainless(316) welding rod. Take the rod and hold it at 12:00 o'clock and push the rod gently down and weld for a couple seconds. Be ready with a wrench that will fit over the stainless bolt. Have it READY! Slowly turn the bolt 15 degrees and then reverse. Keep going back and forth graduley increasing the turns. Works 95% for me, but don't feel defeated if the stainless nut pops off. Just set everything up agin and try again. When you weld the nut, you are putting a great deal of heat into the broken stud. That is why you need to be ready with the wrench. And be sure to use a stainless welding rod,and nothing else. Made my way through college doing these repairs. You can go to any reputable welding shop and tell them of your delimia. They will sell you a couple of rods pretty reasonable. Clean around the broken stud and do your homework. IT WILL BACK OUT! Good Luck and laugh at the broken stud when it comes out.

coldbear 03-02-2013 05:46 PM

Addendum/ HEAT RANGE
That will be 75 amps on the AC/DC welder and start the weld at the center of the broken stud, gradually weld in circles untill you fill the top of the nut. And please don't use a wire gun on this job, as they aren't as successful as AC/DC generators. jmo.

thenorm 03-02-2013 05:51 PM


Originally Posted by anarchy0392 (Post 4616932)
The shop tried to drill and tap. Apparently it broke a few of their drill bits.

find another shop with better drill bits.
I had an engine mount bolt break (the one into the timing cover). it wouldnt back out until i had drilled the whole length of it out. just take your time drilling, and use lots of fluid to lube and cool (cutting oil, WD40, water even)

don627 03-02-2013 06:38 PM

That job right there shouldn't be that bad I mean drill that thing out of there and get a new stud in there.

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