remove broken 10mm cylinder head bolt with 5mm sticking up

[normspanners]

Personally I would test where the bolt was stuck I would do that with a pair of vice grips and see if the bolt moved albeit slightly that tells you a lot, if it moves rotationally slightly it usually tells you where the bolt is jammed ie further down the bolt towards the thread, if it is solid it will be locked higher up in the block.
Also these engines BTW have 3 different length head bolts, are you sure you are measuring correctly ?

 

[clift_d]

Centre punch and drill the centre of the stud, clean up the remaining threads, put on a nut backed off by about half a turn from fully tight, then weld the two together in the centre - a bit like this:

 

[normspanners]

MANY years ago I had a stuck stud in the head of a Triumph Mayflower.

Triumph Stags where also a classic for stuck heads have resorted to some real abuse to get heads off.

There was some VERY old book somewhere that said summat about some old geesser Moses riding down the hill in his triumph---------the head gasket probably went on the way up---- seems they used to break down then too!

 

[normspanners]

Centre punch and drill the centre of the stud, clean up the remaining threads, put on a nut backed off by about half a turn from fully tight, then weld the two together in the centre - a bit like this:

check out posts--- 131-- 140 but better twice than never eh

 

[clift_d]

check out posts--- 131-- 140 but better twice than never eh

<irony>
Oh come on... this is the internet... you can't seriously be expecting me to read anything.
</irony>

On a more serious note, this has come up several times here...

http://www.mig-welding.co.uk/forum/threads/sheared-bolts.47366/#post-527682

 

[penfold]

All's i can say is to set the situation up and have a dozen practice attempts as it will be worth it.

What he said, particularly as you say you're rusty and the equipment at hand isn't ideal, when you actually come to do it you want it to go right because you know what you're doing, not by luck.

As to the 'will it/won't it?' debate about welding a nut on; there's not much alternative beyond drilling it out and welding a nut on does not preclude attempting to drill it out later. The bolt sheared with corrosion seizing it AND the tension in it from when it was done up; the shearing relieved that tension which reduces the amount of twisting needed, added to the thermal shock/cycling from the weld heat this is often enough to release the offending fastener.

 

[bobl]

The now-removed nightmare bolt's in the photo (It's 70mm) along with the very unremarkable equipment used to persuade it
i.e. I've just removed it by centre punching the thing round for about an hour.
I think constantly oiling the bolt hole over several days and tapping before and after helped as suggested by someone here. Thanks!
The punch came in an old canvas bag of brace bits I bought from a boot sale i.e. it's old.
Thank you to all of you for contributing to this thread.
Your interest/advice really inspired me to sort this out and without the right tools I used what I'd got and stayed within my area of competence.

 

[addjunkie]

As your so lucky might i suggest now is a good time to buy a lottery ticket!

 

[bobl]

___As your so lucky might i suggest now is a good time to buy a lottery ticket!
Good one!

In truth I'm still in shock and can't quite believe it. What a technique.

The bolt was VERY hard materal which works in your favour if you can exploit a non-even break
i.e. I was hitting against an uphill bit and whilst I had a dimple...when angling the punch....there was a "wall" of metal in front of it to hit into. I think the punch would've just channeled throuhg a softer bolt given the flat-ish angle I was finally hitting at.
I think the bluntish angle of the point also helped not to cut through the top of the bolt.
Also I had good comfortable access as the bolt was pretty central in the engine bay.

So it's 151 maintenance spray (from Harrisons/The pound shop) all the way from now on + a bit of research re the best centre punches money can buy.

 

[Pete.]

If you got it out with a punch then welding a nut would have turned it out easy.

 

[Chris Stevens]

The nightmare bolt's in the photo I just got it out by centre punching the thing round for about an hour.
The tools used were very unremarkable.
I think constantly oiling the thing over several days and tapping before and after helped too as one of you suggested.
The punch came in an old cloth bag of brace bits I bought from a boot sale i.e. it's old.
Thank you to all of you for contributing to this thread. Your interest/advice really inspired me to sort this out
and without the right tools I used what I'd got and what I'm good at.

Good one.................you were pretty lucky!

 

[God mode restorations]

The nightmare bolt's in the photo I just got it out by centre punching the thing round for about an hour.
The tools used were very unremarkable.
I think constantly oiling the thing over several days and tapping before and after helped too as one of you suggested.
The punch came in an old cloth bag of brace bits I bought from a boot sale i.e. it's old.
Thank you to all of you for contributing to this thread. Your interest/advice really inspired me to sort this out
and without the right tools I used what I'd got and what I'm good at.

Well done..glad you got it out...

 

[cocker]

You lucky lucky boy !!
Get yourself some lottery tickets

 

[the snooper]

lottery tickets ? don't bother with 1 in 45 million chance quit while you are ahead well done

 

[dobbslc]

What are this lot gonna argue about now?!!!

 

[the snooper]

What are this lot gonna argue about now?!!!

 

[normspanners]

Nah you shouldnt have done it that way that will never work!!
I think it coming loose has something to do with the clocks going back and shocking the system because it is impossible to do that way!!

 

[ajlelectronics]

No it was purely down to the Fluffle valve venting into the spigot bush and so cycling the doobrie.

 

[the snooper]

Nah you shouldnt have done it that way that will never work!!
I think it coming loose has something to do with the clocks going back and shocking the system because it is impossible to do that way!!

did the clocks going back cause coefficient of expansion ultimately resulting in the breaking of the bond

 

[Justme]

If you got it out with a punch then welding a nut would have turned it out easy.

As would grinding a thin slot & using a screwdriver lol