Hi Larry. I have a 74TR6 with 175CDSE carbs. I have had the same sort of
questions about the bypass valves. On the 6, there were two types of bypass
valves. The early type had a vacuum port on it. This type was not
adjustable as far as I can determine. The vacuum line was part of the system
that used the water temperature sensor. I don't know exactly how the bypass
valve was part of this but the water sensor sampled the water temperature.
Ast he water temperature/engine temp rose, the vacuum retard at the
distributor was vented causing the engine speed to increase, thereby
decreasing the emission, maybe. Around 1974/75, British Leyand did away with
the water sensor and consequently they changed the bypass valve making it
adjustable from the outside. I just bought two new bypass valves from Moss I
think. There are several places on the internet that discuss how to tune the
bypass valve. I am still playing with them. I do think that there is screw
beneath the small brass plate. Good luck.
Harry Mague
Beavercreek, OH
74TR6
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