crank removal - first timer

smckeown

my first ever majpr job on a bike

I have cross threaded the pedal thread so need to replace the crank and maybe BB

I have removed the bolts each side on the crank..whats the next step as neither side are budging

I've looked in a few books I have but I think this type of crank is
Here are pics of current stage:





Might as well treat it to some new rings and chain at the same time...

cheers
sean

nicklouse

you need a crank puller.

have a read on the how toos on parktools linky below.

smckeown

thanks, what type of crank do i have then ?

jayson

You could try the old trick of riding the bike until u feel it coming loose and wobbly, its worked for me in the past with the old style square taper cranks/bottom brackets.

whyamihere

jayson wrote:

You could try the old trick of riding the bike until u feel it coming loose and wobbly, its worked for me in the past with the old style square taper cranks/bottom brackets.

That destroys the crank arms, and sometimes the bottom bracket too.

smckeown: They appear to be Octalink arms, so you'll need an ISIS crank puller. Best to buy ISIS ones anyway, as they work with square taper BBs, but square taper crank pullers do not work with ISIS/Octalink BBs.

nicklouse

smckeown wrote:

thanks, what type of crank do i have then ?

sorry but it does say on them.

jayson

Dont octalink cranks have a self removing thread or somethin like that on them?? My XT hollow tech cranks simply pull off when i undo the bolt with a 10mm allen key.

nicklouse

some do some dont. LX did not but XT did. iirc.

smckeown

Hi all, latest update....

so i've bought a new crank/bb and all the tools I believe I need to remove and install a new crank.

my first problem is from reading the park tool site, is that the extract tool should thread all the way into the crank right ?



Or do I have the wrong extract tool, this is what I have:



Park Tool Crank Puller & Wrench

smckeown

or should I be threading the insert bolt in like this ???

smckeown

ah i've just worked it out...right onto the next stage...

Sir HC

You had it in the first photo, however, you need to back off the stud that threads into the nut, so the larger nut inserts all the way into the crank arm. Once you've done that, wind in the stud in and start tightening with a spanner.

smckeown

yeah worked that out, i also needed the larger screw insert. the hardesrt part was trying to visualise what the crank/bb connection looked like, as i've never done anything like this before. all made sense in the end

just been to the bikeshop to buy the shimano isi bb remover, so onto the next stage of getting the old bb off...

smckeown

All sorted now, thanks to all for helping me with my first ever serious bike maintenance task 8)

The new BB is sooo much lighter than the old all metal one, and the bike only weighed 17lbs to begin with..superb!





cheers
sean

nicklouse

did you have the bb shell ends faced as recomended by shimano?

smckeown

I read that but didn't understand it. Would love an explanation :oops:

nicklouse

read http://www.parktool.com/repair/readhowto.asp?id=95

smckeown

it says "If spindle appears to catch and will not come out non-drive side cup, may be an indication that shell faces need machining"

Well the spindle went through fine without any significant pressure.

Still no idea what shell faces need machining means, what the hell are shell faces ?

nicklouse

left and right of the shell.

did you look at the pictures?

thought this showed it well.



or maybe this



but it may be that the frame was done before some time.