Originally Posted by
Dal_
Coat either side of the gasket in high temperature gasket sealant before fitting. That normally does it.
Doesn't help that there are only 4 screws / nuts to hold it on.

Nice once, last time i did it i filled the gasket channeling on both sides with silicone, it lasted about a week :-(
I will get some proper gasket sealant and give it another go.
Need to try and track down a bad earth on my Focus too, but thats a whole different kettle of fish, oh well at least the suns out