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seat post jammed in solid cant lift,lower,turn.the seatpost is going into aluminium collar on a carbon frame any ideas how to release
what material is the seat post?
For a couple of frames with jammed seat posts, I have had success with letting a good amount of oil seep in to lubricate it a bit, then get the seat post in a vice, and twist and pull the frame to get it out. It sounds more heavy-handed than it is.
If it's not bottomed out, tapping it down can help- any movement is good movement and it's easier to knock it in than out.
I have done the oil and clamp the seat tube before, worked for me.
I'm not sure how coca-cola will affect a carbon frame, but I've posted instructions as to how to achieve seat pin removal on the below thread:
http://www.singletrackworld.com/forum/topic/the-recreation-of-my-salsa-its-a-road-bikedont-be-scared
As your seat pin is going into an aluminium seat collar my concern for a 'brute force' type attack would be whether the bond bewteen the collar and frame would give before the bond between seat post and collar. Just a thought.
What are you trying to turn it with? Seat still attached? If you're not bothered about sacrificing the seatpost for the sake of the frame, drill through the post with a 6mm bit and use a screwdriver through it to twist on the post... along with everything else thats been said about tapping it up and down.
If you greased the insert that would explain why its stuck in a carbon frame. Good luck.
PlusGas is meant to be the best penetrating oil. Also, check its not something silly like a bottle cage bolt thats been screwed into the post...unlikely but you never know.
Double post
Not all plastics can tolerate solvents. But Loctite Freezeandrelease http://www.loctitefreezeandrelease.com/ can work.
Wurth do a similar product Wurth Rost Off Ice. Plus many other companies
But the plastic of CFRP may not tolerate the solvents.
Drilling a hole in the seat post only weakens the seat post (so it breaks) making it more difficult to get it out.
Liquid nitrogen is ideal if you can get some; with the frame upside down put the seat post in a bucket of liquid nitrogen and then put the seatpost in a vice and twist.
seatpost is going into aluminium collar on a carbon frame
Deca - is this by any chance a Whyte e120 frame? - sounds like my 1st e120 frame - carbon seatpost totally stuck in carbon frame that had alloy collar.
the problem was that the alloy collar was corroded internally and thus had a vice grip around the post and no shifting will budge it.
I contacted ATB sales and they replaced the seatpost and frame under warranty as it was only a year old.