Also check the return valve on the bottom of the radiator cap.
I had a problem where the TR6 would not overheat, but would blow out coolant.
On suggestion from our tech mechanic I checked the return valve on the bottom
of the radiator cap. There was a little crap stuck there that kept it open.
This meant I basically had an open system. To be clear, the cap has two
functions. There is the large seal that closes off the radiator until
pressure is reached to push against the spring and open it. But there is also
a small valve in the center of that large seal that opens toward the radiator.
That's how coolant or air is drawn back into the radiator. If it is held open
by some crap stuck there, the system will be open and you will blow steam.
Peter
** triumphs@autox.team.net **
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