A couple of weeks ago I replaced most of the drivetrain on the bike including a right-hand crank arm fixed to the chainwheels. After a couple of days of coping with the new right-hand crank arm being half the weight of the old left-hand crank arm (very odd... so much for the amateur physicists with balanced shoes), I got around to changing the other (left-hand) crank arm.
However I cannot get the pedal out of it. Just as well I had a spare set of pedals in the cupboard around. I have tried penetrating oil, I have tried clamping the crank arm in a vice, and I have tried tapping it gently with a sledgehammer that I cannot lift with only one hand.
Now, I know about dismantling the pedal and clamping its spindle in a vice, but that seems to be intended for discarding the pedal and saving the crank arm, whereas I am intending to discard the crank arm and keep the pedal.
Now, I know about dismantling the pedal and clamping its spindle in a vice, but that seems to be intended for discarding the pedal and saving the crank arm, whereas I am intending to discard the crank arm and keep the pedal.
Clamp the whole caboodle in something and saw chunks out of the crank until it's had enough and surrenders its grip on the pedal?
However I cannot get the pedal out of it. Just as well I had a spare set of pedals in the cupboard around. I have tried penetrating oil, I have tried clamping the crank arm in a vice, and I have tried tapping it gently with a sledgehammer that I cannot lift with only one hand.
Tapping the spanner, I take it? That with a club hammer (more controllable) usually helps for me - or just tons of elbow grease on the end of a long spanner. Don't forget to turn clockwise.
Heat crank with blow torch or stove if all else fails, and the aluminium crank should expand more/faster than the steel pedal axle.
If you're not using a proper pedal wrench, I suggest you get hold of one. I spent a whole evening trying to get apedal off once, and gave up in the end. I even tried heating up the alu of the crank arm with a camping cooker. The next day I went down to my LBS and bought a pedal wrench and, with the extra leverage provided, the pedal came off in an instant.
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"Geraint Jones" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
A couple of weeks ago I replaced most of the drivetrain on the bike including a right-hand crank arm fixed to the chainwheels. After a couple of days of coping with the new right-hand crank arm being half the weight of the old left-hand crank arm (very odd... so much for the amateur physicists with balanced shoes), I got around to changing the other (left-hand) crank arm.
However I cannot get the pedal out of it. Just as well I had a spare set of pedals in the cupboard around. I have tried penetrating oil, I have tried clamping the crank arm in a vice, and I have tried tapping it gently with a sledgehammer that I cannot lift with only one hand.
Now, I know about dismantling the pedal and clamping its spindle in a vice, but that seems to be intended for discarding the pedal and saving the crank arm, whereas I am intending to discard the crank arm and keep the pedal.
"Pete Biggs" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Geraint Jones said:
However I cannot get the pedal out of it. Just as well I had a spare set of pedals in the cupboard around. I have tried penetrating oil, I have tried clamping the crank arm in a vice, and I have tried tapping it gently with a sledgehammer that I cannot lift with only one hand.
Tapping the spanner, I take it? That with a club hammer (more controllable) usually helps for me - or just tons of elbow grease on
the
Quoted message said:
end of a long spanner. Don't forget to turn clockwise.
Heat crank with blow torch or stove if all else fails, and the
aluminium
Quoted message said:
crank should expand more/faster than the steel pedal axle.
A pot of near-boiling water is worth trying first. Drop crank and pedal in and allow to soak for a couple minutes, then clamp crank in vice and apply a sharp tap with a mallet to the end of the spanner.
But if that doesn't work, then as Pete says, it's blowtorch time.
-- Mark South: Citizen of the World, Denizen of the Net "I wonder why so many Finnish traditions are related with booze?" - Juha Sakkinen
"Dave Larrington" <[email hidden]> wrote: ( Clamp the whole caboodle in something and saw chunks out of the crank until ) it's had enough and surrenders its grip on the pedal?
Rejoice for me, for my left-hand ped threadle which was bound is free. There is, of course, no indication of what was holding it in: clean, well-greased threads, and no sign of any corrosion or anything, not even much of anything you would call dirt. Now someone's going to tell me not to grease pedal threads because it causes them to bind to the cranks.
After assorted heat treatments and batterings I eventually resorted to three hacksaw slots around the periphery of the pedal end of the crank and it just fell out. I still cannot decide whether this was because I had weakened the crank or whether the bluntness of the old blade had heated it up. I know I've got some new blades somewhere... Now I suppose I had better get the alloy filings out of the pedal crankside bearing. Hm.
