I snapped off my heads exhaust studs today

[chobbler]

Getting my old 90k winter bike ready today I could hear the exhaust blowing a bit, found one stud completely gone, just a hole.

Even with care 4 out of the 5 remaining studs then broke off. Some were wasted away so bad a 11mm socket had to be hammered on.

Two on the left head had been attacked long ago by a previous owner; a sorry sight, old breaking out casting around them, drilled and tapped in situ and on the skew.

A couple of urgent questions;

Those socket type stud extractors, is there room between fins to get them in, or do I just dremmel them flush and re drill 'em?

Also I hear I should get a Time-Sert instead of Helicoil?

Any preferences? What's the life of either in the harsh exhaust location? How long have you had yours in?

Any tricks or tips to patch up the old girl welcome.

[nab 301]

Any tricks or tips to patch up the old girl welcome.

So far I've been lucky (never snapped off any studs) but this thread (there are more if you search) sums it all up. (head removal is the best option )

http://www.boxertrix.com/phpBB2/viewtop ... aust+studs


Nigel B

[chobbler]

Thanks Nigel.
I think I'll try the DIY option first, the bikes only worth a tenner.

[Boxered]

Thanks Nigel.
I think I'll try the DIY option first, the bikes only worth a tenner.

I'll give you £20 for it

Steve

[snavetrauts]

I had the same problem..... used the 8mm and then the 6mm stud extractor. Yes they do fit, but they did not work.... and it is very easy to twist them and then break the fins. In the end I did what many on this forum said I should not do .... drill them out.

I ground the stud flat..... centre punched and drilled. I left enough meat just in case I went off centre... I then carefully dremmelled out the remaining stud. I then very carefully retapped the thread moving only one thread at a time... which enabled me to dig out the crap that was left inside. I then used a stainless steel bolt cut to the right length. 3000 miles later it is still there and functioning well.

Good luck with whatever you do.

Stuart

[chobbler]

Thanks lads, all info and tips gratefully received.
I'm booking a week off work shortly purely to live down my shed. This is job no.1

I'm thinking over that £20 offer by the way