Tap broken off in foot peg mount

[noexit]

I'm about to hunt down and beat the shit out of the POS who sold my friend this CB350. She didn't know what she was looking at, other than it was a running CB350, and got seriously ripped off. We'll it ran just long enough for her to get it home. For the price she paid, I would expect a decent restoration. Instead, it's a rust bucket. Now I'm working on it.

Final problem before it's on the road (hopefully!)

The PO was riding it using the passenger foot pegs. He had the shift lever flipped around, so the shift pattern was reversed, but had done nothing to make the rear brake usable. I had my friend get a new foot peg assembly from ebay, went to put it on, and found out why he'd been riding it like this. Looks like he stripped out the threads and had tried to clean them up, then broke a tap off in the hole. I have no idea how the @#$% you'd do that, and I have no idea how the @#$% to get it out. I was excited for her to get a bike, but I'm not happy about fixing this idiot's stupid mistakes.

 

[kopcicle]

one

it will be a small one
two

three

four

use small and localized high heat directly on the broken tap

method one
tap the exposed portion of the broken tap around counter clockwise with the cape chisel . You are bound to break of bits and pieces as you go but on the bright side that's less of the tap you have to remove .

method two
refer to method one with the exception of heating the tap as hot as possible without destroying the surrounding area and then quenching it with water . repeat several times this will embrittle the the tap even more and turn it into more pieces .

method three
warm the tap (not incinerate it this time ) with the bike on its side and plug the through hole if there is one and build a dam around the hole with the clay once it is cool enough . Pour the phosphoric acid in the hole and walk away . Return to chipping away at the tap in the morning .

Repeat the above steps as necessary

tips
if the hole goes all the way through tap the tap back and forth occasionally as well as trying to tap it around counter clockwise .

the threads are pretty much nasty anyway so don't bother being too careful just don't get the 9 lb hammer out .Return to chipping away at the tap in the morning .

alternating a bit of oil to try to get the tap free along with the toxic mess the acid creates can help .
Be on the look out for those moments where you can gain a few degrees with a light touch .

I could have just told you you were screwed but where would the fun be in that ?return to chipping away at the tap in the morning .

~kop

 

[TheCoffeeGuy]

Well there is some merit in Kop's ideas. I have beat this problem and its a game of patience and micro-meteres.

You have to realize that these taps are tapered, a bit, mostly at the end. its the end that's broken off. You will need, a small drift or punch, the smallest hammer you have, spring clip pliers, and a couple of small dental picks.

Tap, and I mean tap, each end of the broken Tap using the punch and small hammer a few times. You are trying to release the thread pressure which and tightened bolt or tap will be under. Then using the other instruments you will attempt to turn out the Tap. Carry on this procedure between the tapping and turning. At one point he Tap will give and you should be able to spin out the rest of it.

patience, patience patience.

 

[Tim]

If the hole does go all the way through, is there any reason to not just drill right on through, not being concerned about the threads, and then mount the footpeg bracket with a longer bolt/nut on the other end?

You can tell I'm not a patient man

Give your friend shit for not taking you with her to buy a bike.

 

[sprocket2cog]

There is actually a tool to remove broken taps, its called a tap extractor.
i was telling my brother about your problem and he told me about the "tool for the job !"

or these with fixed prongs

http://goo.gl/po0kf

 

[Tim]

In my case it's usually a job for the tool (me).

 

[noexit]

Give your friend shit for not taking you with her to buy a bike.

I don't want to give her too much shit because I think she already feels bad. Her excuse was that I was out of town. It's seriously a $600 bike, and she paid $1800 for it. It's missing parts, the clutch was messed up (fixed that last night just before discovering the broken tap), and the frame and tank are rusty even though the tank as been repainted. It has a lot of potential, but it's going to take a full strip down to repaint the frame.

Thanks for your suggestions. I didn't know some of these tools existed. The problem I see is that it looks like someone has already pried at it, so the tools to back it out probably won't work.

 

[sprocket2cog]

yeah i didnt know they exsisted either, bummer they wont fit

 

[GLENNWOOD55CAMEO]

If the hole does go all the way through, is there any reason to not just drill right on through, not being concerned about the threads, and then mount the footpeg bracket with a longer bolt/nut on the other end?

You can tell I'm not a patient man

Yes Tim, there is a reason you can't drill the tap out and that is that it is case hardened steel and is impervious to drilling..................It's just too damned hard to drill.......

 

[cxman]

get a can of liquid wart remover (aka co2 or nitrogen gas ) and a round punch that goes in the hole fairly snug

put a glove on so you dont get any spray back on your skin

spray the stuff on the tap till it is thoroughly iced up and frozen from both sides if possible the colder it get and more

of the super cold ice it has is better

put the punch in and whack the tap

the tap will shatter and come out

this will only work if the hole goes right thru

i shudder to mention this as i got trashed for it on another thread but wear safety glass's as the liquid can burn you eyes

and the tap shattering can cause sharp bits to fly around dont burn yourself

 

[hillsy]

I'd hit it with a punch and leave it in the frame tube. Then weld up the hole and re-tap.

 

[Rich Ard]

Re: Re: Tap broken off in foot peg mount

get a can of liquid wart remover (aka co2 or nitrogen gas ) and a round punch that goes in the hole fairly snug

put a glove on so you dont get any spray back on your skin

spray the stuff on the tap till it is thoroughly iced up and frozen from both sides if possible the colder it get and more

of the super cold ice it has is better

put the punch in and whack the tap

the tap will shatter and come out

this will only work if the hole goes right thru

i shudder to mention this as i got trashed for it on another thread but wear safety glass's as the liquid can burn you eyes

and the tap shattering can cause sharp bits to fly around dont burn yourself

I have used this method and will vouch for it, and second the cautionary note.

 

[noexit]

Here's another angle. This is why I can punch it through, or drill through the frame (not to mention that drilling through the frame would be an idiot thing on par with braking a tap off in there in the first place).

You guys have given me some good ideas. I'm going to try the freezing thing since I have some liquid wart remover (doesn't help for removing warts btw). If that doesn't work, I'm going to mask off everything that's not the tap with clay, and weld a bolt onto it.

If that doesn't work, I'm going to cut it apart, weld a new nut to a new piece of metal, and weld it back in.

I love having my own welder!