willie59
Administrator
Ok, I'll take a stab at this. Sounds like the tranny and converter share oil. Here's my thoughts of how it works. Suction line on side of tranny goes to left side of pump on rear of coverter, that's what we call a "charge pump". The converter doesn't have the ability to draw oil to itself, it has to have oil fed to it under pressure. Oil leaves the charge pump, line on right side of pump, and goes to filter. Oil leaves filter and goes to pressure regulating valve mounted on coverter housing. Two other lines are connected to this chamber on the valve that shares the oil coming from filter. One line goes to pressure gauge on dash to monitor system pressure, the other line goes to transmission control valve to provide pressurised oil to engage fwd and rev clutch packs. Pressure is developed by the spring and cap you described going into the bottom of the 1" port of the pressure regulating valve when you removed valve. Once enough pressure is developed by charge pump, it overcomes the pressure of the spring and it unseats the "cap" or "piston". This also serves as a back flow valve for the conveter. Oil then flows through this port to feed converter via internal piping. Once it's done it's work inside the converter, the oil comes out of converter and goes, via internal piping, to fitting on lower right of coverter housing. Heated oil from coverter goes to engine coolant heat exchanger, then leaves heat exchanger and goes back to sump of transmission to start the flow cycle over again. The 3/4 line on lower left corner of convertor housing and goes back to bottom of tranny is a drain line to drain internal leakage of oil from convertor back to tranny. That's pretty much the way I read it. One question I have, when you removed the pressure regulating valve, you mentioned the 1" port that the spring and piston goes into. Is there another port or hole on the bottom of the valve beside the one you mentioned?