Ammonia for stuck seatpost

[GrumbleJay]

Going to take a deep breath and tackle a very stuck seatpost in a frame I love. Have read Sheldon Brown and got to the bit where he says ammonia can be used for aluminium in aluminium. OK, so question is where do I get ammonia? Can anyone help please.

 

[andy.l]

http://cgi.ebay.co.uk/NEW-AMO-KLEEN-HOU ... 286.c0.m14

 

[JeRkY]

just dont buy industrial quantities without a very good backup explanation.

 

[Corduroyboy]

ammonia can be used for aluminium in aluminium.

No, no, no, no, no! :shock:
You'll dissolve the frame!

 

[spearmint]

Is ammonia supposed to be good for steel frames with aluminium parts stuck in them? Does it have any effect on steel parts stuck in steel frames?

My LBS has been trying to get my bottom bracket out for a while now by drowning it in ammonia every once in a while but with no luck. I’m assuming that the bottom bracket is the original 93 one and would probably be made of steel. Are they wasting their time using ammonia?

 

[Iwasgoodonce]

I thought that any strong alkaline would attack aluminium. I have only heard of it being used to remove (say) an aluminium seatpost stuck in a steel frame. I don't think it attacks steel.

 

[cherrybomb]

Is ammonia supposed to be good for steel frames with aluminium parts stuck in them? Does it have any effect on steel parts stuck in steel frames?

My LBS has been trying to get my bottom bracket out for a while now by drowning it in ammonia every once in a while but with no luck. I’m assuming that the bottom bracket is the original 93 one and would probably be made of steel. Are they wasting their time using ammonia?

Heat is the only answer here I reckon.

 

[tintin40]

You can get sprays that are for stuck/sezed parts. You spray in and leave. Using ammonia sounds not the way to go. I'd tread carefully

 

[spearmint]

Heat is the only answer here I reckon.

looks like it might be time for a strip down and respray. I've been looking for an excuse.

 

[Tallpaul]

Ammonia is the answer for alloy stuck in steel. Although i've heard Coca-Cola is rather succesfull too

Take care when using though, gloves, goggles, outside in the fresh air etc.