Help!! A bolt will not unscrew!!

[rharris21]

How do remove a bolt that it is absolutely solid?

I am replacing an air con pipe on a 330ci - it is such a simple job.. although I thought - two bolts to remove.
The first one was simple no fuss. However the second one which is by the exhaust manifold is absolutely screwed in solid.

I have tried soaking overnight in wd-40 on someones advise.

What advise does anyone else have?

I am desperate to get the new pipe fitted so I can get the air con re gassed.

Any help is greatly appreciated.

[liquidken]

Theres not much else.

You can try tightening it a little more - hopefully breaking whatever corrosive seal is stopping it from undoing. ALternatively, you could get some heat on it. You'd need to be very careful though and do it gently.

[Moar]

plus gas?

[griffter]

clean it up as best you can with a small wire brush and plus gas or wd40. Then tap it gently with a hammer to try to break corrosive seal. If theres room, exert torsion on the bolt with a spanner and tap the spanner increasingly hard in the same direction. Good luck... The simplest jobs often turn out to be the most demanding.

[bluetone]

If there is room, you could try hammering a socket one-size too small on. Bear in mind you may ruin it in the process.

There are also specific sockets you can buy for the job. Will see if I can dig out a reference for you. Make sure you have replacement bolt the same size as the seized one as it will likely be scrap after removal.

[bluetone]

Here you go:

http://m.screwfix.com/pr-gallery.htm?id=96028#imgg...

Good luck - pain the arris job.

If all else fails, a local garage would likely make quick work of it with the application of some heat.

[bluetone]

+ just to add, the above apply once you've rounded the bolt head off, which is highly likely, in my experience

[klarky]

Heat will be your best bet, it's why I have a cheap blow torch I got from home base for working on an old 205gti where bolts are rusted tight.