> My TR 4 is still overheating and I'm wondering if it isn't the
> radiator cap.
> Moss calls for one with a 3/4" depth, and that seems to be all that's
> readily availiable, but when I measure my filler neck it's 3/4" from the
> inside flange to the top of the neck. It seems like the cap
> should be 7/8"
> or so to develop any sort of pressure. Are there deeper radiator caps
> availiable, or am I wrong in thinking that the spring should be
> inside the cap?
John, the cap is slightly longer than 3/4" when not compressed, but only
slightly. There is a stop that keeps the spring from expanding fully. The
3/4" is the radiator measurement.