Mountain Biking - Please help-crank bolt snapped

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technobot
08-09-09, 08:34 AM
Please help me, the other day I has tightening my bikes crank bolt and the bolt snapped in half.
How do I get the bolt out.
I've got pictures below

picture 1:
http://s686.photobucket.com/albums/vv221/technobot360/?action=view&current=Fullbike.jpg

picture 2:
http://s686.photobucket.com/albums/vv221/technobot360/?action=view&current=bottombracket.jpg

picture 3:
http://s686.photobucket.com/albums/vv221/technobot360/?action=view&current=closeupbb.jpg

Thank you :):):):)

ed
08-09-09, 08:39 AM
Go to the hardware store and ask for an "Easy Out". Take the bike with you so they can help you with the right size. Drill out the center of the crank bolt and EZ-out the remains.

Next time invest in a torque wrench and some Loctite. You don't need that much torque on a crank bolt. (not as much as you used anyhoo)
technobot
08-09-09, 08:45 AM
My 14 year old son did that because it is his bike.

ed
08-09-09, 09:02 AM
Aaahaa...been there.

I think the EZOut will get you fixed up. Worst case scenario...a new cheapo bottom bracket for $12.
bikinfool
08-09-09, 04:54 PM
My 14 year old son did that because it is his bike.

Strong kid. What's all the abrasion around the crank bolt on the arm from?
laura*
08-09-09, 06:41 PM
Please help me, the other day I has tightening my bikes crank bolt and the bolt snapped in half.
How do I get the bolt out.

The good news is that the remainder of the bolt is probably neither corroded in place nor under load.

Get a pointy tool (something like a center punch) and a hammer. With these you may be able to "walk" the bolt out by spinning it counterclockwise. Hold the point of the tool offcenter against the bolt, hold the tool at an angle, and tap it with the hammer such that some of the hammer blow turns into a CCW rotation force on the bolt.