So would that mean just a couple of gramms more in the big end of three rods would cause such strong vibration? As I say, it can't be the fan or the TC, because I took them off to check whether it was them and it didn't make a difference...
The last turning thing outside the engine I haven't checked yet is the lower pulley. I'll have to get some kind of auxiliary cooling pump before I can check that, though.
Thanks for the input,
Max