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#1
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Stuck BB Cup - Liquid Wrench vs Ammonia
I am restoring a 1968 road bike, and I have it completely stripped down
except for the right BB cup, which is completely stuck in there. The guys at my LBS suggested that I use Liquid Wrench, but I remember hearing that ammonia can also be used for this purpose. Which is better? |
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#2
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Stuck BB Cup - Liquid Wrench vs Ammonia
Protag Hiro wrote:
I am restoring a 1968 road bike, and I have it completely stripped down except for the right BB cup, which is completely stuck in there. The guys at my LBS suggested that I use Liquid Wrench, but I remember hearing that ammonia can also be used for this purpose. Which is better? Ammonia is good for aluminum, Liquid Wrench for steel. Make sure you're turning it in the correct direction, which will depend on the nationality of the frame. See http://sheldonbrown.com/cribsheet-bottombrackets.html See also: http://sheldonbrown.com/tooltips Sheldon "Unggggghh!" Brown +----------------------------------+ | What sane person could live in | | this world and not be crazy? | | --Ursula K. LeGuin | +----------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
#3
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Stuck BB Cup - Liquid Wrench vs Ammonia
Sheldon and Strayhorn.
It is a pesky French frame, so I know about the direction to turn. Sheldon: That homemade nut/washer/bolt tool is awesome, I cant wait to make one. Strayhorn: I will track down some of that PB Blaster. |
#4
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Stuck BB Cup - Liquid Wrench vs Ammonia
Protag Hiro wrote:
It is a pesky French frame, so I know about the direction to turn. Don't be too sure...some French bikes use Swiss threading. This is true of most Motobécanes and some Peugeots. Sheldon "Try Both Ways, Gradually Increasing Torque" Brown +-----------------------------------------------------+ | If a little knowledge is dangerous, where is | | the man who has so much as to be out of danger? | | --T.H. Huxley | +-----------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
#5
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Stuck BB Cup - Liquid Wrench vs Ammonia
Mine is an Astra. According to your site it is a Moto-for-Beacon. Do ya
think it is Swiss then? Sheldon Brown wrote: Protag Hiro wrote: It is a pesky French frame, so I know about the direction to turn. Don't be too sure...some French bikes use Swiss threading. This is true of most Motobécanes and some Peugeots. Sheldon "Try Both Ways, Gradually Increasing Torque" Brown +-----------------------------------------------------+ | If a little knowledge is dangerous, where is | | the man who has so much as to be out of danger? | | --T.H. Huxley | +-----------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
#6
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Stuck BB Cup - Liquid Wrench vs Ammonia
On 8 Jul 2005 12:47:03 -0700, "Protag Hiro"
wrote: I am restoring a 1968 road bike, and I have it completely stripped down except for the right BB cup, which is completely stuck in there. The guys at my LBS suggested that I use Liquid Wrench, but I remember hearing that ammonia can also be used for this purpose. Which is better? Ammonia works only for parts stuck in aluminum frames, and then only when the depth of the interface is not great. In your case, if getting the part out intact is not essential, I'd use a hacksaw or Dremel to cut through the cup almost into the threads, and then peel it loose from the other side with a hammer and chisel. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#7
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Stuck BB Cup - Liquid Wrench vs Ammonia
On 8 Jul 2005 14:25:22 -0700, "Protag Hiro"
wrote: Sheldon Brown wrote: Protag Hiro wrote: It is a pesky French frame, so I know about the direction to turn. Don't be too sure...some French bikes use Swiss threading. This is true of most Motobécanes and some Peugeots. Mine is an Astra. According to your site it is a Moto-for-Beacon. Do ya think it is Swiss then? Oh, *That* old road bike. Yeah, you want to extract the cup undamaged. If the PB Blaster doesn't get it loose, I'd try judicious use of heat from a propane torch next. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#8
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Stuck BB Cup - Liquid Wrench vs Ammonia
"Protag Hiro" wrote in message ups.com... Mine is an Astra. According to your site it is a Moto-for-Beacon. Do ya think it is Swiss then? Sheldon Brown wrote: Protag Hiro wrote: It is a pesky French frame, so I know about the direction to turn. Don't be too sure...some French bikes use Swiss threading. This is true of most Motobécanes and some Peugeots. If you have the other cup (and the axle & bearings) out, you may be able to tell from looking what direction the threading is just by looking. You'll need a good light, and a clean BB inside. The key point is where the thread disappears behind the cup walls - if you can see that it's easy to tell which way it is threaded. |
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