Question4 ports on the thermostatic vacuum sending unit- M port vacuum lines to bypass valves on all carbs and intake manifold. C port to bottom of carb on drivers side. D port to vacuum advance module on dist. Where does F port go ? Are the other 3 ports in the correct spot ?
Where does the vacuum lines on the air cleaners go ?
Thank you for your time,
Richard
AnswerHi Richard,
Sorry it took so long. I had to dig through old data to locate any info on the 4 port temp switch.
From what I can find the ports are labeled "C", "D", "MT" and "F-1" on the 4 port switch.
"C" goes to the intake vacuum side of a solenoid valve which also connects to a ported vacuum port on the carburetors.
"D" goes to the distributor vacuum retard unit,
"M-T" goes to the air filter.
The only data I found on "F-1" is that in a test procedure for the 4 port switch, it says that when the coolant reaches 220 deg F. that "D" is open to "F-1" and "M-T". This implies that vacuum to the distributor is dumped to outside air when the coolant reaches 220 Deg F.
I have not found anything showing where "F-1" goes to. (possibly dumping EGR vacuum too ?)
I do have a test procedure for the 4 port valve if you want it. let me know.
Howard
