Technical & Reference Section > Tech and Restoration

Removing alloy post from alloy frame

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ozone:

--- Quote from: discostu on March 27, 2013, 08:09 AM ---You can't use that method as it will also eat away the alloy frame.  :daumenhoch:

--- End quote ---

Caustic soda would knack the frame - he's on about using ammonia to dissolve the aluminium oxide - not the entire seat post.   :-\

not johndub71:
Piss has ammonia in it... saves money..

adenough:
With ally, id get a nice sharp screw driver, prize the seat tube open a bit, then fill with WD40, leave for a bit then id whack the seat post (with a mallet) downwards, yes, as  ramming it further in, sounds odd, but if the post moves you can then twist it out  :daumenhoch: if it doesn't go down any further, then you've lost nothing  :daumenhoch:

jT Racing:
Using a hair dryer or careful with a heat gun can crack the bond. Also freezing with one of those pipe freezing gizmos can help. It is a tough bond to break but I've done it a few times.
Putting a steel bar or small steel 'something' in the seat tube to stop it crushing in the vice, get it gripped up nice. Get your heat gun, apply tension(twist) and apply heat, don't cook the fook out of one spot. Two people make it easier, but be patient, keep good tension on the tube and keep it hot. It will crack the bond eventually, might take a few goes over a few days but it's always worked with some fortitude and methodology.

animal:
What size post is it ? 22.5mm ? or larger ? Where u based ?

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