Bicycle Mechanics - 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! :)

Is there room to slide a hacksaw blade in and cut off the spindle?

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.

U could try a 2 arm gear puller

Drill it out?

+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.

It's been covered, about once every other month. Do a search for the 4-5 methods out there.

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

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!

http://i2.photobucket.com/albums/y21/dissident75/Misc%20Bike%20Parts/crank_puller.jpg

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

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

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?




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! :)

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.

There's another issue :

I cannot for the life of me unscrew the right side of the BB :mad:. 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! :D

There's another issue :

I cannot for the life of me unscrew the right side of the BB :mad:. 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! :D

It's a LEFT hand thread!

There's another issue :

I cannot for the life of me unscrew the right side of the BB :mad:. 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! :D

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.

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

lol

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

:D

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.