Copied from a lengthy discussion on another forum,giving a basic way to diagnose the liner fault!
""Unless the engine has been run for a long time then the visual symptoms are not obvious and the visuals could also be that of a leaking head gasket......... pressurizing of the coolant system (particularly evident in the top hose), and a header tank that smells like an old exhaust pipe..............
Probably the safest check is a compression test............... if the compressions are more or less OK, then suspect a liner to block problem................ if the compression on one or two cylinders are way down then suspect a head gasket problem!!"
Seems thats what I have!
It is a rare occurance as the 3.5 block has thicker ally casting than the 3.9's etc,but it can happen.
It could be that the tapping is the tappets and not the liner,but water still oozing up the liner side!
Ive decided that I am going to buy myself a snake camera for Xmas,and have a good look inside when its hot and under pressure!
Now to decide which camera is best,and can I find,buy one,in the Bristol area today??
And NO!!
I really dont want to be using the TR very much in this weather,especially as its damp,and there is now salt on the roads!!