Rising water in the expansion tank

[The Aardvark]

Hello

I currently have the above issue with a TVR Chimaera with a 4 litre Rover RV8 engine.
It's been a bit of an ongoing saga - apologies for the cut & paste, but I've summarised it here -

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Before the engine is stripped down again, I'm posting here on the off chance that someone may suggest something else to check?

Would appreciate any comments.
Many thanks.

[Locknut]

I don't know anything about the TVR or its cooling system but I've read the whole of the other thread, and the only suggestion that makes any sense to me is the one from TVR Beaver and TJC46, who both suggest a certain small hose blocking and not allowing coolant to return. Sorry I can't add any more to the suggestions.

[hman]

As above - it will be the small hose- had this on another rover engined car which was fitted with a small bore metal pipe with a 90 degree turn in it. This had filled solid with crud. Replaced with length of rubber hose - FIXED.