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 10-22-07, 07:16 PM   #1
dmitri926
Senior Member
Thread Starter
 
Join Date: Jun 2006
Bikes:
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Big Problem! stripped thread from crank arm

Hi all,

I have a square tapered crank shaft. I was using the crank removal tool and accidentally stripped off all the threading from the left arm. What are my options in getting the arm off?

The bottom bracket and the crankset are not needed. So they can be damaged in the removal process.

Thank you!! Any suggestions are appreciated!
dmitri926 is offline   Reply With Quote
Old 10-22-07, 07:25 PM   #2
Portis
Banned.
 
Join Date: Sep 2003
Location: Home alone
Bikes: Trek 4300 X 2. Trek 1000, Trek 6000
Posts: 6,019
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is there room to slide a hacksaw blade in and cut off the spindle?
Portis is offline   Reply With Quote
Old 10-22-07, 07:27 PM   #3
barba
Senior Member
 
barba's Avatar
 
Join Date: Nov 2005
Bikes:
Posts: 4,083
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Try carefully riding the bike around. That may loosen it up a bit. They I would go for a wood block and a rubber mallet.
barba is offline   Reply With Quote
Old 10-23-07, 12:08 AM   #4
dahoss2002
Senior Member
 
Join Date: Oct 2006
Location: Bossier City, La
Bikes: 70's Motobecane, 89 Centurion Ironman
Posts: 618
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
U could try a 2 arm gear puller
dahoss2002 is offline   Reply With Quote
Old 10-23-07, 02:12 AM   #5
orangepaint
Senior Member
 
orangepaint's Avatar
 
Join Date: Jul 2007
Location: Vangroovy, BC
Bikes:
Posts: 379
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Drill it out?
orangepaint is offline   Reply With Quote
Old 10-23-07, 02:29 AM   #6
WNG
Spin Forest! Spin!
 
WNG's Avatar
 
Join Date: Sep 2007
Location: Arrid Zone-a
Bikes: I used to have many. And I Will again.
Posts: 5,967
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
+1 on the gear puller.
Go to a FLAPS like Autozone, and see if they have a loner tool program.
Get the 2 or 3 arm gear puller. A small one should do.
WNG is offline   Reply With Quote
Old 10-23-07, 08:01 AM   #7
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's been covered, about once every other month. Do a search for the 4-5 methods out there.
tellyho is offline   Reply With Quote
Old 10-23-07, 10:05 AM   #8
knotty
Lost in Nostalgia
 
Join Date: Sep 2007
Location: Fog City
Bikes:
Posts: 651
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Many times a small, thin, 3" cutoff wheel on a angle grinder will work wonders. Careful though you don't let it overrun and damage a good part.

knotty
knotty is offline   Reply With Quote
Old 10-23-07, 03:23 PM   #9
JunkYardBike
Since 1938...
 
JunkYardBike's Avatar
 
Join Date: Aug 2006
Location: Northwestern NJ
Bikes:
Posts: 6,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by knotty View Post
Many times a small, thin, 3" cutoff wheel on a angle grinder will work wonders. Careful though you don't let it overrun and damage a good part.

knotty
I found this at a garage sale for $1. I've been told it's probably a gear puller. Works like a charm, with a hell of a pop!


Last edited by JunkYardBike; 10-23-07 at 03:34 PM.
JunkYardBike is offline   Reply With Quote
Old 10-23-07, 03:28 PM   #10
john_iverson
Senior Member
 
Join Date: Mar 2006
Bikes:
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Junkyardbike you are on it. I've got a puller very much like that one and have had to use it twice now on stripped arms. To the OP: Get/borrow one and don't be afraid to take a file to the crankarm if you have to make a notch or two so the puller can get a good bite. worke every time.

John
john_iverson is offline   Reply With Quote
Old 10-23-07, 08:28 PM   #11
knotty
Lost in Nostalgia
 
Join Date: Sep 2007
Location: Fog City
Bikes:
Posts: 651
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JunkYardBike, that's a good puller, I have several OTC tools. My dad was a auto mechanic and machinist and left me with many good tools. Have several steel boxes of Snap-On pullers from a small 2" jaw to huge 16" jaws for stuff like pulling car flywheels off.

knotty
knotty is offline   Reply With Quote
Old 10-23-07, 08:37 PM   #12
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Two options... use a hammer and a piece of wood.

Second option. take the cups out... Probably u have room for the tools, just lose the cup little by little and the whole thing will come out. Im asuming square tapper ok?



Quote:
Originally Posted by dmitri926 View Post
Hi all,

I have a square tapered crank shaft. I was using the crank removal tool and accidentally stripped off all the threading from the left arm. What are my options in getting the arm off?

The bottom bracket and the crankset are not needed. So they can be damaged in the removal process.

Thank you!! Any suggestions are appreciated!
ultraman6970 is offline   Reply With Quote
Old 10-23-07, 09:45 PM   #13
dmitri926
Senior Member
Thread Starter
 
Join Date: Jun 2006
Bikes:
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks to everyone! .. i went out and got a craftsman gear puller and a hacksaw (just in case). The gear puller worked fairly well, had a little difficulty gripping the crankarm with it.
dmitri926 is offline   Reply With Quote
Old 10-23-07, 09:57 PM   #14
dmitri926
Senior Member
Thread Starter
 
Join Date: Jun 2006
Bikes:
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There's another issue :

I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

Thanks again! much appreciated!
dmitri926 is offline   Reply With Quote
Old 10-23-07, 10:06 PM   #15
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Quote:
Originally Posted by dmitri926 View Post
There's another issue :

I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

Thanks again! much appreciated!
It's a LEFT hand thread!
Bill Kapaun is offline   Reply With Quote
Old 10-23-07, 10:39 PM   #16
JunkYardBike
Since 1938...
 
JunkYardBike's Avatar
 
Join Date: Aug 2006
Location: Northwestern NJ
Bikes:
Posts: 6,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dmitri926 View Post
There's another issue :

I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

Thanks again! much appreciated!
Which right side? Assuming this is a standard English threaded BB, the fixed cup (on the crankset side) loosens by turning clockwise. However, on the adjustable side (adjustable cup with lockring) it loosens by turning counter-clockwise.

If it's Italian or French threaded, the fixed cup loosens counter-clockwise.
JunkYardBike is offline   Reply With Quote
Old 10-24-07, 07:31 AM   #17
edzo
Senior Member
 
Join Date: Feb 2006
Bikes:
Posts: 1,564
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
put the bolt in the spindle but leave it loose. throw locktite
in there so it doesn't just fall out, or use duct tape over the hole
you want to have it pretty loose

go ride some steep hills pretty hard but expect the crank arm to loosen

it will eventually loosen then you can take it off by hand
edzo is offline   Reply With Quote
Old 10-24-07, 06:06 PM   #18
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
lol
ultraman6970 is offline   Reply With Quote
Old 10-24-07, 06:35 PM   #19
dmitri926
Senior Member
Thread Starter
 
Join Date: Jun 2006
Bikes:
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by edzo View Post
put the bolt in the spindle but leave it loose. throw locktite
in there so it doesn't just fall out, or use duct tape over the hole
you want to have it pretty loose

go ride some steep hills pretty hard but expect the crank arm to loosen

it will eventually loosen then you can take it off by hand
dmitri926 is offline   Reply With Quote
Old 10-24-07, 06:35 PM   #20
vasracer
vasracer
 
Join Date: Oct 2007
Location: NYC!!!!
Bikes: Leader LD-735TR, Mercier Kilo tt, 3Rensho pursuit(not complete)
Posts: 247
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Get some penetrating oil, Spray it on let it sit for an hour or two and repeat. This time tap it lightly with a hammer. The idea here is the first spray breaks down some of the rust, the second spray will work into the small nooks the first spray created. When it comes out and your ready to install the bottom bracket use anti-seize on the threads, This will prevent you from having this problem in the future.
vasracer 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 01:53 AM.