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Best way to remove rusted-on seatpost?

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Best way to remove rusted-on seatpost?

Old 08-13-08, 08:41 PM
  #1  
nepg
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Best way to remove rusted-on seatpost?

Is the 'hacksaw' method my best/only choice here? That sucker won't budge. WD40 does zilch. Really need to get this thing off so I can finish prep'ing the frame... Didn't want to have to get a new seat post, but even if I wasn't trying to resto the frame (more saving it than restoring it), I can't adjust it to get a proper fit.
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Old 08-13-08, 09:07 PM
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try some kroil
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Old 08-14-08, 05:11 AM
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Originally Posted by A.Winthrop View Post
Hi,
.
If your seatpost has flutes that extend down into the
seat tube, fill them with strong ammonia and let it soak
for an hour or more. If you don't have flutes, you can
open up the bottom bracket, turn your bike upside down and
pour enough strong ammonia down the seat tube to fill the
hollow seatpost and then get in around the edges of the
outer surface of the seatpost and the inner surface of the
seat tube.
.
I rode a bike with a stuck seatpost for a year without the
binder bolt with various potions poured down the flutes but
with no effect. Then I poured strong ammonia down the flutes,
had lunch, gave the saddle a twist and out came the seatpost.
.
I've never tried pouring ammonia in from the bottom bracket
and I would be reluctant to do so but I'd rather do that
than try to hacksaw off the top of the post, hacksaw a long
cut down the length of the post and then break it out with
torque. This is the other last resort method.
.
The key to the strong ammonia method is finding a way to
get it seeping between the post and the walls of the tube.
I had long flutes and that was a big part of my success.
.
Keep in mind that stong ammonia is STRONG so handle it
carefully, keep it away from your eyes and kids and flush it
out of your seat tube if you go the bottom bracket route.
.
Household ammonia won't work. Get the strong stuff at your
hardware store. It's about a dollar a quart.
.
Great advice. Also put the post in a vice and use the frame as the lever. Much more force than twisting a seat.

Last edited by coldass; 08-18-08 at 10:34 AM.
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Old 08-14-08, 05:18 AM
  #4  
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http://www.sheldonbrown.com/stuck-seatposts.html
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Old 08-14-08, 07:48 AM
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A.W's ammonia works if you have aluminum involved. I'm assuming you have an AL post in a steel frame.
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Old 08-14-08, 10:07 AM
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I'm pretty sure it's steel in steel. Will that trick not work with a steel post?
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Old 08-14-08, 12:25 PM
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Can you get a slide hammer? If not you can probably fashion a 'make-do' one. The idea is a long shaft (~24") that a large weight (10lbs or so) slides on with a stop at the end. One end gets attached to the seat post some how and the stop is at the other end, it works kind of like hammering but in reverse.

A little story... I was working on a car and had to take off the wheel hub which was a press fit. I tried prying and banging from the back for hours to the point of almost breaking something and still no-go. I rented a slide hammer and attached it the hub. While getting ready to give it a hell of a yank, doing a double pump, I ended up accidentally hitting the end of the slide shaft and the hub fell out onto the ground. I couldn't believe how easy it came out!

Depending what you have handy you might be able to slap'n'tack something together that will work.

Just an idea,
Ryan

Last edited by Ryan_M; 08-14-08 at 12:30 PM.
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Old 08-14-08, 01:01 PM
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Originally Posted by nepg View Post
I'm pretty sure it's steel in steel. Will that trick not work with a steel post?
Nope, but PB Blaster is better than WD40. I bought mine at KMart, so it's readily available.
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Old 08-14-08, 05:54 PM
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Just go with the hacksaw, it's the last resort method but it's bound to work.
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Old 08-14-08, 06:09 PM
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why would you use a hacksaw? you'd be destroying the seatpost AND leaving an end in the frame.

i'd work with penetrating oil, but the ammonia idea sounds good.

if push comes to shove, i'd use a pipe wrench on it. you'll get a hell of a lot of torque with a pipe wrench.
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Old 08-14-08, 07:21 PM
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Here is what worked for me, twice. Do this before the hacksaw and after the WD40, penetrating oil, ammonia, and whatever else you pour in. If the post has flats on the side that you can put the biggest adustable wrench you have on this might work. Great if the frame is stripped. Lay the frame flat on the floor, put the wrench on the flats, and stomp on the wrench handle as hard as you can. Be careful you don't hurt yourself. If you can break it loose, the rest is easy.
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Old 08-14-08, 09:37 PM
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That sounds like an injury, but I'll have to try it. Hey, I've got medical insurance that I pretty much never use...
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Old 08-15-08, 02:47 PM
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Originally Posted by coldass View Post
Also put the post in a vice and us the frame as the lever. Much more force than twisting a seat.
Best advice here.

MUCH better than stomping on a wrench unless you like to limp.
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Old 08-15-08, 03:16 PM
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done

ok--- pour liquid wrench in and around , leave overnight----- have a shot of bourbon in the morning---
smoke a camel--- leaverage is everything--- find something to anchor the frame--- get a LARGE--- vicegrip-- this will ruin the post--- you could wrap the post---- but ----- put a pipe around the vice handle--- turn---- I've done this before on stems and posts--- if you dont want to ruin the post--
keeep soaking in LW don't panic ---- have another shot ( makers mark).
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Old 08-15-08, 03:24 PM
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Or!

Drill a hole thru the seat post......large enough to put some kind of bar(still rod/long screw driver?)thru it and twist.......good luck......let us know how it all works out....
I'll drink to that!
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Old 08-15-08, 08:00 PM
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A safer way would be to put a section of pipe to use as a cheater bar over the wrench handle. I will bet that if you have a long enough bar, the post will come loose, or the post (or the frame) will twist.
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Old 08-16-08, 08:00 AM
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The best way is to use the search feature of this site using the term" stuck seatpost", then read the thousands of responses to the hundreds of times this question has previously been posted.
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Old 08-16-08, 08:17 AM
  #18  
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Originally Posted by Noam Zane View Post
The best way is to use the search feature of this site using the term" stuck seatpost", then read the thousands of responses to the hundreds of times this question has previously been posted.
you are no fun.
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Old 08-17-08, 06:17 PM
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Originally Posted by G piny parnas View Post
ok--- pour liquid wrench in and around , leave overnight----- have a shot of bourbon in the morning---
smoke a camel--- leaverage is everything--- find something to anchor the frame--- get a LARGE--- vicegrip-- this will ruin the post--- you could wrap the post---- but ----- put a pipe around the vice handle--- turn---- I've done this before on stems and posts--- if you dont want to ruin the post--
keeep soaking in LW don't panic ---- have another shot ( makers mark).
I guess you're trying to be a groovey bike messenger type, but the "smoke a camel" thing went out with James Dean (Google it).
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Old 08-17-08, 10:32 PM
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Originally Posted by Zan View Post
why would you use a hacksaw? you'd be destroying the seatpost AND leaving an end in the frame.
The "hacksaw method" doesn't leave anything in the frame. It involves removing the blade from a hacksaw and sticking it inside the seatpost, and cutting outwards towards the frame. Once a slice has been taken out, strong pliers can be used to peel the rest of the seatpost away from the frame. It certainly does destroy the seatpost, but if it's really seized there's no other option.
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