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  #1  
Old 06-01-2012, 11:30 PM
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Default Threaded bolt of death

So the bolt that conects the rear coilover to the trailing arm on my mini is kinda cross threaded. I bought new bolts but before I put them in I need to re-thread the trailing arm. Has anyone done this? I was told it might not be possible and if its not what can I do?
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Last edited by justintime; 06-01-2012 at 11:50 PM..
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Old 06-01-2012, 11:36 PM
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Do you have a thread bit?
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Old 06-01-2012, 11:44 PM
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Do you have a thread bit?
negative

is there a reason I cannot use a tap?
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Old 06-02-2012, 12:08 AM
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I don't see why not
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Old 06-02-2012, 12:13 AM
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heli-coiling is your friend...

http://www.youtube.com/watch?v=sQHRB2ElZJ0

kits on ebay are about 9 in the uk, so imagine they'll be proper cheap your end!

i just used one on a stripped thread on my rear subframe. it worked a treat and allowed for full torque to be re-applied to the bolt after.

the best way to do this, i imagine, will be to remove the trail arm and work on it off the car. it shouldn't be too difficult at all!
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Old 06-02-2012, 12:15 AM
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You might make it worse by tapping it if you dont get the tap aligned correctly. You could always try and get the bolt thru and put a nut on the end.
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Old 06-02-2012, 01:18 AM
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....wow, how did u.... nvm not gonna ask. pro tip start by running the bolt in from the other side and that usually will fix that problem, also if that bolt is rusty wich most of them are it's the rust that makes it feel like it's cross threaded, run it threw a terminal cleaner or wire brush then thread dope it and see if that fixes your problem before you tard coil it.
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Old 06-02-2012, 03:36 AM
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You might make it worse by tapping it if you dont get the tap aligned correctly. You could always try and get the bolt thru and put a nut on the end.
thats how Ive had it the last few years but I've never felt good about it even with safety wire
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Old 06-02-2012, 05:10 AM
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Those bolts rust really bad. I had the hardest time taking that same bolt out of my friends Mini last night. Good luck with it!
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Old 06-02-2012, 06:02 AM
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Quote:
Originally Posted by Kris View Post
....wow, how did u.... nvm not gonna ask. pro tip start by running the bolt in from the other side and that usually will fix that problem, also if that bolt is rusty wich most of them are it's the rust that makes it feel like it's cross threaded, run it threw a terminal cleaner or wire brush then thread dope it and see if that fixes your problem before you tard coil it.
+1 ditto

Also you could try chasing the threads with a tap that's the same size as the bolt to clean it up.
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Old 06-02-2012, 01:10 PM
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You can also get a longer bolt and do a through bolt with a nut. My drivers side has been like that for over a year now.
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Old 06-02-2012, 01:16 PM
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Quote:
Originally Posted by rickyr53 View Post
Those bolts rust really bad. I had the hardest time taking that same bolt out of my friends Mini last night. Good luck with it!
Took me 2 afternoons last year to get them both of. Cleaned the threads and used a lift + air tools when I had to take them of again last month, took like 10 seconds...
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Old 06-02-2012, 01:46 PM
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Took me 2 afternoons last year to get them both of. Cleaned the threads and used a lift + air tools when I had to take them of again last month, took like 10 seconds...
using air tools to get the rusty bolts out is what screwed mine up lol. I would not recommend doing that
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Old 06-03-2012, 12:13 AM
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I just use a small hand torch to heat up the threaded area on the arm. Dont heat the bolt as its the threads you want to expand, I have even gotten cross threaded ones out like this.

On the steel arms I use a thread tap, if thats a no go I cut it off as its just a nut welded to the arm, then weld on a new nut and paint.
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Old 06-03-2012, 01:28 AM
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I
On the steel arms I use a thread tap, if thats a no go I cut it off as its just a nut welded to the arm, then weld on a new nut and paint.
that is an excellent point, I think I shall do that
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