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#11
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Square-taper cranks won't come off. Tricks?
On Tuesday, May 23, 2017 at 12:23:51 AM UTC-7, John B. wrote:
On Mon, 22 May 2017 13:43:19 -0700, Joerg wrote: The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. From the last time the BB was replaced the bike experienced a transport across the Atlantic on a ship which probably hasn't helped matters. Any tricks of the trade? (1) screw the crank puller into the crank all the way, tighten everything and give the puller a sharp rap with a hammer. I don't mean a two handed welt intended to drive it through the bottom bracket and out the other side, just a sharp rap. Some times a bit of a shock is all it takes. (2) get everything set and then heat the crank with a hair drier. If you can get the aluminum crank hot enough so that you can't hold your finger on it that would be about right. Then a sharp rap and see. (3) Take the bike to your local bike shop, describe your attempts at removing the cranks and then say, "Can I pick it up in a week, from next Monday?". That's the normal way John, but I assume that Jeorg already has tried that. Lightly heating usually works through simple expansion. |
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#12
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Square-taper cranks won't come off. Tricks?
On 2017-05-22 13:43, Joerg wrote:
The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. From the last time the BB was replaced the bike experienced a transport across the Atlantic on a ship which probably hasn't helped matters. Any tricks of the trade? Folks, thanks for all your input. I finally got it off after taking a wooden mallet to the wrench that was turning the puller yesterday night. I figured if I strip the puller I'd just grind everything off and go to Octalink or whatever. AFAIK Octalink won't need a puller. BTW, that puller where the thread got stripped was not a Harborfreight deal but an expensive commercial grade version from a professional mechanic. And yes, I plan to re-use the cranks if possible. I tightened up the old Shimano 600 BB. The large chain ring had almost 1/10" play and now none. Let's see if it has some life in it. If not it'll get replaced. Shimano offers one kind (UN26 or so) with one nut being plastic and another with steel but more than 2x the price. Does anyone know whether the plastic ones hold up for people who mash up hills with some load on the bike? I mean 8-10k miles, since I don't expect much more out of a BB anyhow. -- Regards, Joerg http://www.analogconsultants.com/ |
#13
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Square-taper cranks won't come off. Tricks?
On Tuesday, May 23, 2017 at 7:18:56 AM UTC-7, Joerg wrote:
On 2017-05-22 13:43, Joerg wrote: The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. From the last time the BB was replaced the bike experienced a transport across the Atlantic on a ship which probably hasn't helped matters. Any tricks of the trade? Folks, thanks for all your input. I finally got it off after taking a wooden mallet to the wrench that was turning the puller yesterday night. I figured if I strip the puller I'd just grind everything off and go to Octalink or whatever. AFAIK Octalink won't need a puller. BTW, that puller where the thread got stripped was not a Harborfreight deal but an expensive commercial grade version from a professional mechanic. And yes, I plan to re-use the cranks if possible. I tightened up the old Shimano 600 BB. The large chain ring had almost 1/10" play and now none. Let's see if it has some life in it. If not it'll get replaced. Shimano offers one kind (UN26 or so) with one nut being plastic and another with steel but more than 2x the price. Does anyone know whether the plastic ones hold up for people who mash up hills with some load on the bike? I mean 8-10k miles, since I don't expect much more out of a BB anyhow. Octalink does not work with square taper. The plastic retaining ring will hold up fine on a UN-whatever, although the original Shimano 600 used an asymmetrical BB, IIRC. -- Jay Beattie. |
#14
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Square-taper cranks won't come off. Tricks?
"Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. |
#15
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Square-taper cranks won't come off. Tricks?
On Tuesday, May 23, 2017 at 10:58:39 AM UTC-7, Ian Field wrote:
"Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. My Park crank tool has always worked IF and only if you screw it in all the way. And tighten it against the stops. |
#16
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Square-taper cranks won't come off. Tricks?
On Tuesday, May 23, 2017 at 10:58:39 AM UTC-7, Ian Field wrote:
"Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. Why Copper |
#17
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Square-taper cranks won't come off. Tricks?
On 2017-05-23 08:29, jbeattie wrote:
On Tuesday, May 23, 2017 at 7:18:56 AM UTC-7, Joerg wrote: On 2017-05-22 13:43, Joerg wrote: The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. From the last time the BB was replaced the bike experienced a transport across the Atlantic on a ship which probably hasn't helped matters. Any tricks of the trade? Folks, thanks for all your input. I finally got it off after taking a wooden mallet to the wrench that was turning the puller yesterday night. I figured if I strip the puller I'd just grind everything off and go to Octalink or whatever. AFAIK Octalink won't need a puller. BTW, that puller where the thread got stripped was not a Harborfreight deal but an expensive commercial grade version from a professional mechanic. And yes, I plan to re-use the cranks if possible. I tightened up the old Shimano 600 BB. The large chain ring had almost 1/10" play and now none. Let's see if it has some life in it. If not it'll get replaced. Shimano offers one kind (UN26 or so) with one nut being plastic and another with steel but more than 2x the price. Does anyone know whether the plastic ones hold up for people who mash up hills with some load on the bike? I mean 8-10k miles, since I don't expect much more out of a BB anyhow. Octalink does not work with square taper. I know. I would have then replaced the whole works, BB assembly plus cranks. ... The plastic retaining ring will hold up fine on a UN-whatever, although the original Shimano 600 used an asymmetrical BB, IIRC. Yup, might be an issue. It looks symmetrical but I'll have to measure. -- Regards, Joerg http://www.analogconsultants.com/ |
#18
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Square-taper cranks won't come off. Tricks?
"Doug Landau" wrote in message ... On Tuesday, May 23, 2017 at 10:58:39 AM UTC-7, Ian Field wrote: "Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. Why Copper Coppaslip is probably one of the best known anti-seize compounds, I have a tub of silver coloured grease that might be zinc, lead and various other ingredients. |
#19
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Square-taper cranks won't come off. Tricks?
On 5/23/2017 2:27 PM, Ian Field wrote:
"Doug Landau" wrote in message ... On Tuesday, May 23, 2017 at 10:58:39 AM UTC-7, Ian Field wrote: "Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. Why Copper Coppaslip is probably one of the best known anti-seize compounds, I have a tub of silver coloured grease that might be zinc, lead and various other ingredients. Usually molybdenum when it isn't copper based. Either is good for anticorrosive protection. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#20
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Square-taper cranks won't come off. Tricks?
On Tuesday, May 23, 2017 at 12:27:33 PM UTC-7, Ian Field wrote:
"Doug Landau" wrote in message ... On Tuesday, May 23, 2017 at 10:58:39 AM UTC-7, Ian Field wrote: "Joerg" wrote in message ... The BB on my steel-frame bike is knackered and I can't get the cranks off the square tapers anymore. Afraid I'll strip out the thread of the puller tool. Various penetrating sprays didn't help. The first puller tool I bought was NFG - it was pretty rare that it didn't strip the thread. The one I bought from Halfords has worked OK on even the difficult cranks. Most of the alternatives involve varying degrees of damage. Hammering it is likely to destroy the BB ball bearings and cups. Heat can work, but the cranks are usually coated and will be ruined. If it requires extreme violence - you could damage the frame. I'd hacksaw the ends off the spindle so I can dismantle the BB bearing and start over with new parts. Some copper no-seize grease on square taper reassembly might make things easier next time. Why Copper Coppaslip is probably one of the best known anti-seize compounds, I have a tub of silver coloured grease that might be zinc, lead and various other ingredients. But it has no aluminum to give up to the reaction so the crank doesn't have to. |
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