Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-21-07, 02:28 AM   #1
gm1230126
barnfullagts
Thread Starter
 
Join Date: Oct 2005
Location: WI
Bikes: GT BI Ti/BI Steel - Edge Ti and Steel Xizang Ti and Psyclone Steel
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Stripped 8mm self extracting crank bolt

Picked up an older bike today with XTR octalink crank/BB and the drive side 8mm self extracting crank bolt is rounded out. Sure some of you guys working in shops have run into this before. Anyone have a good coarse of action for getting it out? Thanks
gm1230126 is offline   Reply With Quote
Old 11-21-07, 06:24 AM   #2
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,734
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
The 8mm bolt is rounded out? That's scary.

If it was my bike the first thing that I would do would be to use a pin wrench to remove the self-extracting collar. Then I'd see if a brand new 8mm allen wrench will remove the bolt. If that doesn't work, (and I doubt it will), I'd go to a tool store and buy an EZ-out and the proper size drill bit to go with it.

Good luck.
Retro Grouch is offline   Reply With Quote
Old 11-21-07, 08:33 AM   #3
Marrock
Senior Member
 
Marrock's Avatar
 
Join Date: Sep 2007
Bikes:
Posts: 1,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dremel tool and prayer?
Marrock is offline   Reply With Quote
Old 11-21-07, 10:02 AM   #4
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Octalink bottom brackets have a hollow spindle with a 15mm ID and the fixing bolt has (or in your case, had) an 8mm hex so drilling the hex out with any bit equal to or smaller than 8mm shouldn't hurt the spindle if you keep the drill straight. Once you've drilled through the bolt, an Easy-Out should be able to grip the bolt and remove it.
HillRider is offline   Reply With Quote
Old 11-21-07, 07:52 PM   #5
gm1230126
barnfullagts
Thread Starter
 
Join Date: Oct 2005
Location: WI
Bikes: GT BI Ti/BI Steel - Edge Ti and Steel Xizang Ti and Psyclone Steel
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys....that's pretty much what I'd thought. Will put the frame on a drill press and give it a whirl. New 8mm couldn't turn it either. It's just to rounded out in there. I tried filling in around it with thin metal but still couldn't get any bite.
gm1230126 is offline   Reply With Quote
Old 11-21-07, 08:45 PM   #6
orange leader
B-b-b-b-b-b-bicicle Rider
 
orange leader's Avatar
 
Join Date: Apr 2005
Location: Northfield, MN
Bikes: 1997, stumpjumper S-works hardtail, Medici, Giant allegre (track dropouts and fixed gear), Columbia twosome, schwinn twinn, '67 raleigh 5 speed internal hub, Old triumph 3 speed, old BSA 3-speed, schwinn Racer 2spd kickback, Broken raysport criteriu
Posts: 739
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by gm1230126 View Post
New 8mm couldn't turn it either. It's just to rounded out in there. I tried filling in around it with thin metal but still couldn't get any bite.
Instead of buying a new 8mm, try just grinding the worn ends until you get down to fresh crisp corners.
It extends the life of the allen wrenches.
orange leader is offline   Reply With Quote
Old 11-21-07, 09:07 PM   #7
mtnbiker4791
Senior Member
 
Join Date: Dec 2006
Location: Aurora,CO
Bikes:
Posts: 298
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can also try to find a torx key that is just a bit too big to fit in the 8mm bolt head and pound it in. Have done this on many bolts before and works fairly well most of the time
mtnbiker4791 is offline   Reply With Quote
Old 11-21-07, 09:10 PM   #8
time bandit
¡Senor Member!
 
time bandit's Avatar
 
Join Date: Jul 2007
Location: South Philly
Bikes:
Posts: 1,710
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
^that was gonna be my suggestion. torx it.
time bandit is offline   Reply With Quote
Old 11-21-07, 09:14 PM   #9
nitropowered
Senior Member
 
Join Date: Dec 2004
Location: Athens, Ohio
Bikes: Custom Custom Custom
Posts: 5,104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Take a dremel and cut in a slot so you can get a flat head screw driver in it and get the biggest flat head you an find. It'll be tough to try to get it out with a flat head, but its worth a shot before you completely drill through the head
nitropowered is offline   Reply With Quote
Old 12-10-07, 02:35 AM   #10
dirtbag214
Member
 
Join Date: Oct 2007
Bikes:
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
what the hell is an "easy out"?
dirtbag214 is offline   Reply With Quote
Old 12-10-07, 08:46 AM   #11
Marrock
Senior Member
 
Marrock's Avatar
 
Join Date: Sep 2007
Bikes:
Posts: 1,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dirtbag214 View Post
what the hell is an "easy out"?
Something you use to extract broken screws and bolts.

Marrock is offline   Reply With Quote
Old 12-10-07, 08:54 AM   #12
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,734
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Quote:
Originally Posted by dirtbag214 View Post
what the hell is an "easy out"?
Tool stores or better hardware stores will have them. It kind of looks like a tapered drill bit with a left hand thread. First you drill a hole in the fastener that you're trying to remove with a regular drill bit that matches your EZ-out. Then you screw the EZ-out counter-clockwise into the stuck fastener. As it bites in it will back the fastener out.
Retro Grouch is offline   Reply With Quote
Old 12-11-07, 01:32 PM   #13
miamijim
Senior Member
 
miamijim's Avatar
 
Join Date: Aug 2003
Location: Tampa, Florida
Bikes:
Posts: 13,291
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
You can also try a slightly larger american sized allen key.....pound it in tight with a hammer.
__________________
WWW.CYCLESPEUGEOT.COM 1984 Schwinn Paramount; 1987 Schwinn Paramount; 1975 Tom Ritchey, 198X Vitus
miamijim is offline   Reply With Quote
Old 12-12-07, 01:19 PM   #14
robp
Junior Member
 
Join Date: Nov 2007
Location: Kansas City, MO
Bikes:
Posts: 19
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the easiest way I can think is use a punch and a hammer to get the bolt moving then use the torx trick to spin it out the rest of the way
robp is offline   Reply With Quote
Old 12-12-07, 02:20 PM   #15
Marrock
Senior Member
 
Marrock's Avatar
 
Join Date: Sep 2007
Bikes:
Posts: 1,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just a couple days ago I had an allen bolt that the head rounded out on from rust (bought a used bike that'd been stored in a shed) and I just ******d it really good with WD-40 and hammered a regular slotted screwdriver into it (gotta love dollar stores for disposable tools), then gave it a twist with a pair of channel locks on the handle, popped it right out.
Marrock is offline   Reply With Quote
Old 12-14-07, 12:18 AM   #16
Booger1
Senior Member
 
Join Date: Sep 2007
Location: Gaseous Cloud around Uranus
Bikes:
Posts: 3,730
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
EZ-outs are what keep the EDM people in business....
Booger1 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:13 PM.