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Seat Post Frozen to Frame

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Seat Post Frozen to Frame

Old 09-24-08, 09:32 AM
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Daytrip
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Seat Post Frozen to Frame

I'm trying to restore a '70s Viscount and the aluminum seatpost is frozen to the chrome moly frame. Has been for decades. Now I want to pull it out and replace it. What's the best approach?

My initial thought is to drench the area with Liquid Wrench and then try to drive the post down a bit in order to break it free, then turn it out of there with a pipe wrench. I have another post, so I'm not worried about wrecking it. But I don't want to screw up the frame in the process.

I don't mind cutting the post off and trying to sawzall the stuck part out of there in sections, but only as a last resort. Depends on how far into the frame it goes, too, I guess.
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Old 09-24-08, 11:31 AM
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try using alumina instead of liquid wrench ,yes if all else fail it time cut her out.
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Old 09-24-08, 11:38 AM
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Amonia works well to
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Old 09-24-08, 11:41 AM
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PB Blaster is golden. Soak at least overnight. Soak from each end, as well.
A large wrench first. Then Seat post in very strong vise and carefully twist the frame.
CAREFULLY, use a heat gun. Alternate parts and areas, try to move it hot and cold. Some use CO2 to cool parts as well, such as in the Zinn manuals. I have not. I have used compressed air in/on but generally, heat has been sufficient, so far.
I have yet to need to cut out a post since trying these. Good luck.
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Old 09-24-08, 11:45 AM
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One other thing. Be wary of driving the post in, as sometimes the issue is an out-of-round seat tube. Example, post set too high and bending the tube, or even an oversized post being put in. Have seen these more than once.
That said, you can do it, and use it as a way of getting the oil or penetrating liquid in, just be careful. I like to exhaust the other methods first.
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Old 09-24-08, 12:08 PM
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When you say "heat gun" are you talking about a paint stripper-style electric heat gun, or a propane or mapp gas torch?

Thanks for the warning on driving the post in. I tend to agree that's asking for trouble.
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Old 09-24-08, 12:50 PM
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cut the top of the post off--- drill that sucker--- hand cut with a handleless blade--
squeeze together--- poof........
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Old 09-24-08, 01:07 PM
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this might help
http://sheldonbrown.com/stuck-seatposts.html
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Old 09-24-08, 01:18 PM
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Good old Sheldon, r.i.p.

Hey, I learned a few things. Since this is an aluminum post in a steel frame, looks like ammonia would be a good place to start. The part about aluminum expanding faster than steel when heated was also interesting.

No doubt this will all end with a hacksaw, but not without checking out the alternatives, first.
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Old 09-24-08, 02:03 PM
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This Viscount doesn't have an aluminum "death fork", does it?

http://www.sheldonbrown.com/lambert.html
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Old 09-24-08, 02:17 PM
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It does, but not for long. Too bad, because it's pretty.

I put many city miles on that thing back in the late '70s and never knew. I learned about the FOD a few years ago and felt like a survivor. I have a chrome fork from another Viscount that I'm going to swap in if it fits.
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Old 09-25-08, 12:23 AM
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Heat gun, not torch

You can use a torch, I suppose, but one can heat up the parts and not lose any paint etc. if careful. This is a last resort. If the frame is lugged, be extra careful with heat.
You can probably get it out with just a vise and not have to take any of the more drastic measures.
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