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Old 01-05-2017, 02:22 PM   #1
iPee
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Header broken studs

In the process of removing my exhaust I broke 1/4 studs that connect the header to the exhaust.

http://www.realoem.com/bmw/enUS/show...diagId=11_4354

Part #2.

I was thinking of drilling the broken one out, and replacing with a bolt and nut instead. Do you guys have any suggestions on getting the broken stud out. It seems pretty stuck in there. I was hoping to not have to remove the header and just work from underneath the car.


Thanks
Ivan
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Old 01-05-2017, 02:30 PM   #2
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You could PB blast it for a couple days, torch it and then use a vice grip to try and turn it out. That's probably the least invasive way to get it out. But, drilling it out and using a bolt and nut is definitely going to be the easiest and most time effective way.
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Old 01-05-2017, 02:38 PM   #3
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Cool sounds good I'll PB blast it for now. It's been weeks since I've touched it just got back from HK, but IIRC the stud snapped right off where it meets the exhaust so I cant grip it with a vice.

From the pics it looks it's just pressed in right?
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Old 01-05-2017, 02:42 PM   #4
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I see, if the back of the stud is flat, it should be pressed in, but I haven't worked on an m42's exhaust first hand. If it is pressed in, after a good few days of pb blasting, you can drill a small hole through, so it will collapse when you try and hit or press it out.
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Old 01-05-2017, 04:37 PM   #5
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How close did it break off? They punch our pretty easy with a hammer, no need to drill. Usually I pound a new one back in, but a nut/bolt has worked in a pinch.
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Old 01-05-2017, 07:41 PM   #6
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If the hammer doesn't work try an air chisel. The track car got all of the studs on the join replaced with bolts as we didn't want a stud to break or seize on track, seems to have worked just fine.
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Old 01-05-2017, 08:08 PM   #7
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Originally Posted by roguetoaster View Post
If the hammer doesn't work try an air chisel. The track car got all of the studs on the join replaced with bolts as we didn't want a stud to break or seize on track, seems to have worked just fine.
Because RACECAR!

J/K Nut and bolt works just fine, just the shop OCD kicks in and am always afraid of the future repercussions of something coming out of my shop being viewed as an "improper repair". We tend to be OEM oriented.
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Old 01-12-2017, 09:38 AM   #8
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Mine appeared to be pressed and then tack welded in, looks factory. I took a cut off wheel and cut off as much of the head as I could, then used a cold chisel to get the remaining meat out and punch the stud right out.

Replaced with stainless steel nut/washer/bolt combo, 100x better. I put the nuts on the bottom of the header just like the stock arrangement, you can easily fit a box end wrench on the bolt side when you loosen the nut.
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so if you didnt get it like that did you glue fuzzy oil to the entire thing?
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Old 01-13-2017, 09:30 AM   #9
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I haven't gone back to the garage yet since posting, it's been freezing up here as of late. When we first looked at it my friend said it may be welded on as well. Were you able to cut the head off the stud, with the header still in place or did you have to remove the manifold?
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