Vehicle & Technical > Discovery

How can I remove a snapped bolt

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Tyke:
Your welcome mate.

I'll just say again that if you've never done this before, be carefull. If the extractor or drill break in the bolt they are a devil to remove, you will need a specialst engineer to sort it out then.

Another thing to watch is whether or not the bolt can be drilled through or whether it has 'bottomed out in blind hole when it sheared.

If blind it could be a little more awkward to remove and if you drill through then bits of swarf will probably end up in the swivel housing, not good for seals or bearings. You may end up stripping the housing just to clean the swarf out. Gentle heat around the area of the bolt hole may also help if that is possible.

On the other hand, it may just 'pop' straight out, they sometimes look worse than they really are. All depends on why it broke in the first place and usually thats because the bolt has bottomed out in a blind hole and has been overtightened or it is siezed into the threads.

thermidorthelobster:
I think I might put one of these kits on the shopping list.  I broke a bolt in the exhaust downpipe of the 101 in Africa and it was a PITA.  Although, it would have been a sod to get to.

Tyke:

--- Quote ---Although, it would have been a sod to get to
--- End quote ---


Afraid that's usually the problem. A mate of mine did a stud on his V8 inlet manifold a while back. No access with 'normal' gear, rang a local engineer and he said scrap the engine  :shock:

Finally got it out by drilling tiny holes in the end of the stud with one of those hand sized Dremmel 'hobby drills', collapsed the stud into the hole and then picked out the bits with a scriber and magnet. Took absolutely ages to do and at one point he seriously considered resigning the motor to the scarp bin.

I then found an engineering company in Sheffield who specialise in removing broken studs/extractors. They use a laser welder to 'build up' the end of the stud/extractor and then weld a nut on top of that. Bingo, wind it all out with a spanner. Would have needed the engine out to set it up on the laser rig anyway so just as well we found a way, also it's quite expensive to do it with the laser apparently.



What do they say, 'When needs must?' . . . .  :wink:

BrumLee:

--- Quote from: "Tyke" ---http://www.fine-tools.co.uk/Merchant2/merchant.mvc?Screen=PROD&Product_Code=SO6&Category_Code=
--- End quote ---


Absolutely agree this is the best tool for the job as the worm type of extractor only expands the broken bit  :roll:

Mark, If you're coming up to Solihull tomorrow I'll bring my kit with me  :wink:

Homer:
Luckily I had another look at it before I spent any money.

Was going to have a quick go and see if I could do anything using the drill, put the drill bit on the bolt and notcied that it moved! so after 10 mins of messing about with a pair of long nose pliers and a screwdriver the offending bolt is now out.

I will put one of those kits on the shopping list for next time though!


Cheers


Mark

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