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#1
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Reasonable expectation...............
The bike I built up on a frame I dragged out of a hedge has a seized seat
post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. |
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#2
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Reasonable expectation...............
On 9/14/2017 12:32 PM, Ian Field wrote:
The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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Reasonable expectation...............
On 2017-09-14 10:32, Ian Field wrote:
The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? If it's a steel frame and steel post probably not. If both aluminum, maybe. Other tricks: Stand the bike on its head and let penetrating out run from the BB area down inside the seat tune. Let it sit like this for days. The drain hole in the BB tube could suffice to get the oil in there without having to remove the BB (if that ever comes out). You could also shove some sort of cardboard stopper way down the seat post but not into the seat tube. Gently heat the seat tube from the outside but without burning off the paint, feed ice cubes down the seat post. That could help with an ever so smaller contraction of the seat post versus the seat tube. -- Regards, Joerg http://www.analogconsultants.com/ |
#4
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Reasonable expectation...............
On 2017-09-14 10:42, AMuzi wrote:
On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) -- Regards, Joerg http://www.analogconsultants.com/ |
#5
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Reasonable expectation...............
On Thursday, September 14, 2017 at 10:32:54 AM UTC-7, Ian Field wrote:
The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Coca-cola |
#6
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Reasonable expectation...............
"Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. |
#7
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Reasonable expectation...............
On Thu, 14 Sep 2017 21:33:17 +0100, "Ian Field"
wrote: "Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. If it is an aluminum seat post in a steel frame and you can't budge it with a, oh say 24 inch pipe wrench, after a few days of penetrating oil then it probably won't come out without some serious attention. I once spent nearly a week to make a boring bar and boring out a stuck seat tube after all else failed however after reading the Internet I discovered that dissolving the aluminum tube using lye would have been much easier :-) Try https://www.sheldonbrown.com/stuck-seatposts.html -- Cheers, John B. |
#8
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Reasonable expectation...............
"John B." wrote in message ... On Thu, 14 Sep 2017 21:33:17 +0100, "Ian Field" wrote: "Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. If it is an aluminum seat post in a steel frame and you can't budge it with a, oh say 24 inch pipe wrench, after a few days of penetrating oil then it probably won't come out without some serious attention. I once spent nearly a week to make a boring bar and boring out a stuck seat tube after all else failed however after reading the Internet I discovered that dissolving the aluminum tube using lye would have been much easier :-) No aluminium - and I wouldn't want a glob of corrosive **** running down into the BB bracket if there was. |
#9
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Reasonable expectation...............
On Fri, 15 Sep 2017 19:59:27 +0100, "Ian Field"
wrote: "John B." wrote in message .. . On Thu, 14 Sep 2017 21:33:17 +0100, "Ian Field" wrote: "Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. If it is an aluminum seat post in a steel frame and you can't budge it with a, oh say 24 inch pipe wrench, after a few days of penetrating oil then it probably won't come out without some serious attention. I once spent nearly a week to make a boring bar and boring out a stuck seat tube after all else failed however after reading the Internet I discovered that dissolving the aluminum tube using lye would have been much easier :-) No aluminium - and I wouldn't want a glob of corrosive **** running down into the BB bracket if there was. You are supposed to disassemble the bicycle before you start :-( From the Internet: As a strong alkali, sodium hydroxide will attack and dissolve the following metals: Tin, Aluminum, zinc, cadmium - behaves closely enough to zinc. It will also attack chromium plating and copper, although ammonia is far better at dissolving copper: The reaction with those metals releases hydrogen gas. Sodium hydroxide will not react with iron or steel, in fact the alkaline conditions will not allow rust to grow; -- Cheers, John B. |
#10
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Reasonable expectation...............
"John B." wrote in message ... On Fri, 15 Sep 2017 19:59:27 +0100, "Ian Field" wrote: "John B." wrote in message . .. On Thu, 14 Sep 2017 21:33:17 +0100, "Ian Field" wrote: "Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. If it is an aluminum seat post in a steel frame and you can't budge it with a, oh say 24 inch pipe wrench, after a few days of penetrating oil then it probably won't come out without some serious attention. I once spent nearly a week to make a boring bar and boring out a stuck seat tube after all else failed however after reading the Internet I discovered that dissolving the aluminum tube using lye would have been much easier :-) No aluminium - and I wouldn't want a glob of corrosive **** running down into the BB bracket if there was. You are supposed to disassemble the bicycle before you start :-( Like removing the seat post - which is what I couldn't do to start with.......................... |
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