removing a alloy valve cap?

[5lab]

alright chaps

my 3 month-old (to me) mx5 came with some rather interesting silver alloy valve caps. Which, being metal, have seized onto the valves themselves. I've managed to get all but one off (and replaced with plastic) but the last one is still screwing me over. Any tips on getting it off? The caps are hexagonal, so I can get loads of purchase on them, but the valve is just twisting round behind (even with a wrench on them). Given it a shot of wd40 to no avail, are there any other options short of getting it re-valved?

oh, found a CD in the car last week (true story). Girls aloud greatest hits.

yeah, it might be a 'little' girly..

[SystemParanoia]

just get a new valve fitted.

thats what i had to do as i managed to completely destroy the old one



and still didnt get the cap off.

normal plastic ones for me until the apocolypse!

[Jayho]

might be able to buy a valve key!

[tvrtim]

Yes, been there.
Its the cold weather that causes
the problem,combined with alloy/brass
corrosion.
Got mine off (eventually) by soaking
a rag with cold water to protect the rubber
part of the valve and using a fag lighter
to heat the cap.
I would not use them again over the winter
months, and even in summer would grease them
before fitting.

[Jayho]

a little bit of petroleum jelly does wonders on valve caps!

[Poledriver]

Jayho said:

a little bit of petroleum jelly does wonders on valve caps!

Must...not...do...EFA!