Seized BB30 Crank & Bearing

jc-bike-person
jc-bike-person Posts: 69
edited March 2012 in Workshop
All - I am in need of some help.
My BB30 crank has seized inside the bearing. I cannot remove it.
I have got the non-drive side crank off and it has exposed the other crankset through the bearing
Apparently - the correct way is to 'knock it out' with a rubber mallet. However I have tried this and it is not moving
(as per the workshop article on this site)
I have hit it pretty hard (and then very hard) with a big hammer and a block of wood - but still no movement
Any ideas?
Some 'chemical to spray into the joint area? (already tried GT40)
Heat it up?
Anything else?
... must train harder

Comments

  • nicklouse
    nicklouse Posts: 50,675
    Plus gas and more force.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • sungod
    sungod Posts: 16,561
    as above, try plusgas, for penetrating it's better than wd40, way way way better than gt85

    if there's a hole in the underside of the bb shell, try to get some in there so that it runs onto the bearings from the inner side (bike horizontal, spray in and rotate cranks, leave it an hour, turn bike over, repeat to get at other inner face

    the bearing races will be steel, the spindle aluminium alloy, heat will just make it tighter

    you could try a can of freezer and spray inside the spindle, it'll contract more than the steel of the bearing race
    my bike - faster than god's and twice as shiny
  • jc-bike-person
    jc-bike-person Posts: 69
    Thanks. Can of Plus-gas bought
    Time to bring out the big hammer
    ... must train harder

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