Tank Slap - Motorcycle Forum

I've already consigned myself to thinking I'll get a mechanic to drill them out. But means I need to get it in a van or something to get it to them. And also deciding who I trust to do it

I'd seen loads of vids on you tube where they heat the studs and it comes out. So thought I'd give it a go. The blow torch was only 12 quid so worth a go

It's these 2 buggers

The stud is the male part. It's the block i.e the female part that needs expanding via the application of heat.

You expand the block and the stud is than loose.

Heating the stud will expand it and make it tighter in the block.

It would also be extremely difficult to actually heat the block in isolation and not the stud at the same time. If they both expand you have achieved no advantage.

Take it too a Pro. You've had a go but it's not a job for the inexperienced and even experienced people need to know when to stop and give it to an expert.

Also if an expert fooks it up he makes it good at his cost. The liability is his not yours.

You might have more luck with a freezing spray applied directly to the stud, I’d try everything before trying to drill them out. Might be worth warming the surrounding alloy beforehand so when the stud contracts you break the seal between them.

Could try these D6.

I get my bikes MOT here so can’t vouch for anymore than that but they seem a decent bunch and the owner lives local (and has a van) so he might pick the bike up for you.

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You've saved a fortune doing most of the work yourself D.

Not having a dig saying take it to a Pro, but that's what I would do if it were me and being honest I would appreciate someone telling me to know when to stop. Its so easy to get carried away and focused on achieving success at any cost and you live to regret your decsion with hindsight. Been there done that

Its a tricky job drilling small studs out. Personally I would give the problem, liability and stress to someone else.

Deegee wrote:You might have more luck with a freezing spray applied directly to the stud, I’d try everything before trying to drill them out. Might be worth warming the surrounding alloy beforehand so when the stud contracts you break the seal between them.

Just looked and freezing sprays are pretty cheap. So might give this a whirl first. And then if still no luck, phone a few places and see if anyone is willing to drill it out for me

Blade wrote:You've saved a fortune doing most of the work yourself D.

Not having a dig saying take it to a Pro, but that's what I would do if it were me and being honest I would appreciate someone telling me to know when to stop. Its so easy to get carried away and focused on achieving success at any cost and you live to regret your decsion with hindsight. Been there done that

Its a tricky job drilling small studs out. Personally I would give the problem, liability and stress to someone else.

Don't worry I'm not taking anything personally. I know my limits and was never gonna attempt drilling it out as I know I'd **** it up. Lol

It's most likely galvanic corrosion (dissimilar metals) .

If you want to keep trying, I would repeatedly hit the sheared of end of the stud ( I.e hit the stud into the block) to try and shock it and break the corrosion. Get some plus gas into the thread if possible and get some small stilsons or a good quality set of mole grips on the outside of the sheared thread and try and undo the stud. Be controlled and careful how much torque you apply.

Good luck.

Plusgas has done **** all.

Will try a freeze and shock spray next and see how that goes. Will probably be next weekend now.

Tbh looking at the photos you've posted, as the studs point slightly downwards I imagine the plus gas has just run off and therefore isn't getting to do its job.

It needs to penetrate the joint between the threads to work.

Another trick, if there is enough material sticking out, use a dremel to cut a slot wide enough to get a flat head in there and use shock / heat to try and loosen it enough to turn it.



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Leave it at work and hope one of the engineers feel sorry for it.

Kwacky wrote:Leave it at work and hope one of the engineers feel sorry for it.

That could work, or they could see the state of it and it could not end so well..

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How about you get a raw steel nut, fasten it onto the broken off stud & weld the stud & nut together. Then simply un-bolt the stud.

StMarks wrote:How about you get a raw steel nut, fasten it onto the broken off stud & weld the stud & nut together. Then simply un-bolt the stud.

don't encourage him , can't you see the harm he's done with ordinary tools and you want him to play with a welder ???!!!

Lol. Yes not sure i will weld.

Well did some research and the bolts have thread lock on them. It's not corrosion. Which explains why the ones that came out are actually pretty clean.

A guy at work said heat is my best bet. Get the stud really hot to break the bond of the glue.

He also suggested welding a nut on.

He's gonna lend me his heat gun to see if I have better luck with that

Might be worth drilling a hole in scrap piece of steel plate to fit over the stud while you're heating it, just to protect the engine coating, I don't know if it'll withstand direct heat at the temps required to degrade loctite - 150-250 deg C depending on which grade has been used. Just a thought.