F@#Ked Crank

CowboyBob

Right, just spent the last hour trying to remove my right crank. Left came off ok yesterday but the right is not budging.

Crank extractor does not work as the fecker appears to be glued in? and bent the handle to the extractor.
Since it's a hollow isis bottom bracket I slipped in a metal rod down the middle so I knock it out.
After 20 minutes hitting it with a hammer..... then a lump hammer the thing has not moved at all.

I've tried levering it off with no luck.

Other than taking a hacksaw to it what else can I try?

I very pissed off as it is a set of Raceface cranks.

nicklouse

a better ISIS extractor?

CowboyBob

It was a Park Tool.

Koiler

put the other one back on, bolt it up, take the bolt out of the stuck one and try (gently) riding around for a bit. it might free it up. just stay seated when pedalling!

and dont pedal too hard as you can damage the splines if it suddenly gives way

cooldad

You could try self extracting bolts.

cooldad

Or give it a whack anticlockwise to see if it loosens.

nicklouse

cooldad wrote:

Or give it a whack anticlockwise to see if it loosens.

how would that help.

CowboyBob

cooldad wrote:

Or give it a whack anticlockwise to see if it loosens.

It's an Isis crank.

I've whacked the fecker six ways to Sunday. I going to take a hacksaw to it at the weekend.

Need to get a new bloody crank now.

I'm not a happy bunny.

noppy

nicklouse wrote:

cooldad wrote:

Or give it a whack anticlockwise to see if it loosens.

how would that help.

it does sometimes work

it just frees it i dunno the technical reason behind it but iv used this trick a number of times
what about a blow torch gently heat it ? (dont shout at me if this is really bad for bike frames iv only used this on steel with steel bolts.)

cooldad

nicklouse wrote:

cooldad wrote:

Or give it a whack anticlockwise to see if it loosens.

how would that help.

If it's buggered the splines somehow rotating normally (clockwise) figure it's worth a try whacking it the opposite way, sort of like an impact driver.
Plus I like hammers.

The Rookie

The Hammer - otherwise known as the Birmingham screwdriver!

Tried getting some heat into the crank arm to expand it off the splines?

Simon

ds690

Had this happen to me before and found out that the washer from the crank bolt was still in there. Took out the, now bent, washer and crankarm came off fine.

jayson

Had this happen to me before, the only way i could get it removed was to unscrew the opposite side BB cup. As u unscrew it VERY gently the action of unscrewing and removing the cup should pull it out of the crank arm.

You should be very carefull though cos u do run the risk of strippin the BB threads in the frame meaning you'll have to have them re-done if u do ruin them.

The Rookie

EH?
ISIS, right side, so undo left side 'cup' and it comes out the frame leaving remainder of BB and right crank in EXACTLY the same place.

Simon

jayson

The Beginner wrote:

EH?
ISIS, right side, so undo left side 'cup' and it comes out the frame leaving remainder of BB and right crank in EXACTLY the same place.

Simon

I was simply relayin my experience with a stuck crank and other possible solutions to the problem :roll:

The Rookie

But it's not a possible solution to the OP's problem is it, unless you make it clear its NOT for the OP they will assume it is.

Simon

birchy

I'm not to familar with these cranks but if ever on a rare occasion cranks are stuck on etc on some of the wrecks i fix for my mates (work bikes) i find a blow torch will usually free siezed parts as the metals are forced to expand at different rates and freeing them up just be careful of any painted surfaces etc as the will be ruined

nicklouse

CowboyBob wrote:

cooldad wrote:

Or give it a whack anticlockwise to see if it loosens.

It's an Isis crank.

I've whacked the fecker six ways to Sunday. I going to take a hacksaw to it at the weekend.

Need to get a new bloody crank now.

I'm not a happy bunny.

why? just get a tool that works.

unless you have now destroyed the threads ( you dont say).

CowboyBob

Threads are still good.

The dam thing is jammed on tight.

The extractor works by expressing l force on the bottom bracket (while screwed into the crank arm) pushing the two apart.
The hammer/rod (with extractor screwed in to form a stopper) through the middle of the hollow BB expresses force on the extractor/crank arm to push the two parts apart.

Will I be able to exert more force with a 5 inch handled extractor or with a lump hammer?

It is possible to get the same results using two different mechanical approaches.

The hacksaw is the next approach.

The Rookie

You'll get more force wuth the extractor and without loading the bearings as you will with a hammer.

You could use the extractor to get a high preload on it and then use a hammer to try and jar it loose if you can't get it off with the extractor alone.

Simon

02gf74

check there is no washer.

not sure if your spindle is hollow but the extractor screws into the crank arm and then pushes on the spindle - check that this happens - with my extractor I need to put a bolt in loosely and/or with a washer so the crank pushes agasint the spindle else it would push agasint the crank and it ain't comming apart like that.

also use a blow torch - that will heat the alloy crank arm so it exopands so loosen its grip.,

have to admint, if you haven;t stripped the threads in the arm that an extractor cannot pull the arm off .... but then I am not seeing what you are doing and it may be that the arm is on really REALLY tight, hhmmmm......

CowboyBob

I've got it off!!!!!

Hacksawed off the BB axel, placed crank on gas stove for 10 minutes, hammer and large screw driver through it. a few minutes of hitting later out popped the last of the BB axel.

Axel ribs look as if some one has been gripping them with pliers

:evil: :evil: :evil: :evil: :evil: :evil: :evil:

02gf74

photo so we can enjoy your triumph!!????

nicklouse

CowboyBob wrote:

Axel ribs look as if some one has been gripping them with pliers

:evil: :evil: :evil: :evil: :evil: :evil: :evil:

yes they often have groove marks on them.