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Seized seat runners


gm44

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I'm trying to fit a Tillet seat in time for Brands on Monday but am struggling to remove the existing Caterham seat runners, as they are seized in a position where I can't access the head of the bolts that go through the floor.  Both runners on the drivers side are stuck.  Is there  a technique to get the runners moving, other than soaking with WD40 which I've already failed with?

Thanks Gerard

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I recommend using PlusGas penetrating fluid rather than ordinary WD-40.

Is the problem that the bolts are turning when you try to remove the nut? If so cut a transverse slot in the free end of the bolt and hold it still with a screwdriver while you bring the nut down.

There are several alternative ways of refitting the fastener so that this doesn't happen again, including wedging or welding the bolts into the seat frame.

Jonathan 

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Yes to penetrating fluid (PlusGas or the WD40 equivalent rather than the standard stuff). I find the engineering of the spray is considerably better from WD40.

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Yes to a hammer to knock the upper part along the lower part.

Familiar issue.

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If they are a normal bolt head, this will trap itself in the seat runner and not rotate. If you use a flat head screwdriver under the washer on the underside of the floor to help keep pressure on the bolt downwards, you should be able to undo the bolts. 
 

if they are capheads, I'd use Jonathan's suggestion and try and cut a slot in the bolt and use a screwdriver to stop the bolt rotating 

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I used plus gas and gently used a pry bar to lever between a chassis tube and a cross bar on the seat base.  Once the seat moves then it should loosen up.

As for the seat bolts / nuts - I'm planning on fitting capheads when I refit.  Gripping a std hex bolt head was very awkward when I was removing...

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