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 Post subject: help please
PostPosted: Mon Apr 25, 2011 8:51 pm 
Devout Dirtbag

Joined: Sat Mar 26, 2011 3:44 pm
Posts: 111
A couple of questions to help me out please

How to remove a seized seatpost ? I can't get it to move at all

And on the chainstays is a bridging bar but it doesn't go all the way across and it doesn't look like its been cut so if not as a strengthener what is its purpose?

Thanks


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 Post subject:
PostPosted: Mon Apr 25, 2011 11:00 pm 
Dirt Disciple

Joined: Sun Apr 24, 2011 11:21 pm
Posts: 51
Location: St.Helens
If people tell you to use WD40 or penetrants they just don't work unless it is steel in steel. Alloy
next to steel causes a chemical reaction, and gives off aluminium oxide. The only way to remove it, was turn the bike upside down
and pour caustic soda into the frame down the seat tube from either the bottom bracket or holes for mounting a water bottle. Caustic
soda crystals are available from anywhere (£1.29 Wilko). It has no effect on steel or paintwork, but fizzes and rots aluminium
viciously. It normally takes 3 or 4 days and the rotten seatpost just drops out.

Hope this helps.

BTW: I didn't write that.


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 Post subject:
PostPosted: Tue Apr 26, 2011 1:19 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
Posts: 18207
Location: Sunny Glasgow
Several methods work,at least to some degree :? Plusgas,cocacola,heat ,sometimes just plain old brute force
What is the frame made of ? what is the seatpost made of ?.

I'd suggest asking the same question in the off topic section in general chat.
Seems a common problem in old mtb's being renovated


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 Post subject:
PostPosted: Tue Apr 26, 2011 7:56 am 
r.B.o.T.M. & P.o.T.M. Winner
r.B.o.T.M. & P.o.T.M. Winner
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Joined: Sun Jul 11, 2010 1:41 pm
Posts: 2449
Location: Plymouth, UK
Coca cols is an altogether more sweeter less aggressive way of moving the post, it does work too.


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 Post subject:
PostPosted: Tue Apr 26, 2011 9:45 am 
Devout Dirtbag

Joined: Sat Mar 26, 2011 3:44 pm
Posts: 111
Frame is 501 and the seatpost is alloy so i'll have a go with the coca cola method, I've used it inthe past for removing pitting from chrome so can believe that it works, cheers for the answers 8)

Anyone any clue on the frame?


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 Post subject:
PostPosted: Tue Apr 26, 2011 12:27 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5131
Location: Wakefield, Yorkshire
The bar on the chainstay is probably to clip the bottom end of a mudguard onto. I have a DynaTech MTB with the same type of fitting.


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 Post subject:
PostPosted: Tue Apr 26, 2011 2:33 pm 
Devout Dirtbag

Joined: Sat Mar 26, 2011 3:44 pm
Posts: 111
Cheers Ned :wink:


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 Post subject:
PostPosted: Thu Apr 28, 2011 4:54 pm 
Devout Dirtbag

Joined: Sat Mar 26, 2011 3:44 pm
Posts: 111
Bloody seatpost ain't shifting :-)


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 Post subject: remove seat post
PostPosted: Thu Apr 28, 2011 6:40 pm 
Retro Guru

Joined: Wed Nov 04, 2009 9:57 pm
Posts: 641
cobby1970 wrote:
Bloody seatpost ain't shifting :-)


this should work, never failed me in 30 years !!!!!

if you are going to repaint the frame then warm the frame around the seat post and down the seat tube with either a hair dryer or a hot air gun but it may start to melt the paint, the steel will expand before the alloy and then spray WD 40 down between them it will smoke to start with but then will seep between them. put an old saddle on to use to force the post round, you might have to do it again and again.

if you do not want to damage the paint, just warm the seat post itself and it will expand and warm the seat post too again fill with WD40/Plusgas.

may take a few attempts.

if its really struck its an oxy/acet job and a respray thats how frame builders get them out...


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 Post subject:
PostPosted: Thu Apr 28, 2011 7:21 pm 
Devout Dirtbag

Joined: Sat Mar 26, 2011 3:44 pm
Posts: 111
I'll try the heat method as its going for powder/respray anyway but can't attach a seat for leverage as the clamp for the seat has had the threads stripped and won't hold tight
thanks for the tip :wink:


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