Ok, so who knows where I can get one of these for Captain Plugwash???

It's a Motorcraft radiator blanking cap, with 'Motorcraft 100' and '06390' written on it...



Google is not helping at all...

Motorcraft should be via Ford themselves, but no doubt the parts guy won't be helpful... I haven't found one that is yet.

I'd try calling or emailing that picture to Burton Power perhaps, or try the likes of Scholar or Raceline... It looks identical to the one on top of my thermostat housing - has a spring loaded rubber washer that opens with enough pressure to let coolant into the overflow bottle...?

Nope, no spring at all - it's a blanking cap, with no pressure release at all.
There are 'cheap' alternatives available, but they tend to 'bend' and leak...

I've tried Ford's parts website, but nothing found at all...

Ok - it seems it's a Ford Capri blanking cap, but I still can't actually locate any for sale...

Try Brian Goode here:

http://www.bgcmotorsport.co.uk/#

He's an absolute mine of information for all brake, cooling and fuel plumbing.

Not 100% certain but pretty sure this is a cap with no spring.

http://www.burtonpower.com/parts-by-category/cooling-system/radiator-caps-thermostats /radiator-cap-metal-type-fc52.html

It appears to have a 'LBS' value on the left - that suggest it has a spring pressure.



But thanks for trying!

I found the actual cap!!!

http://www.retrofordinternational.co.uk/radiator-cap-2108-p.asp

Hello, i have some Motorcraft 06390 cover (but without the "Motorcraft 100" ...)

greeneye5 at gmx.de