1941 power windows

Posted by ineffabill On 2011/1/24 18:12:18

Hello to all, this is my first post to the Packard forum. I'm a mechanic, & I'm looking for help in repairing a "shop project", a 1941 180 Touring Sedan (model 1907).
To date I have performed a "light" engine overhaul, radiator rebuild, new chassis wiring harness, & new brake hydraulics.
Currently I am repairing the power window system. It needs cylinders, solenoids, & hoses. The pump wasn't as bad as I expected for 70 years of brake fluid exposure. BUT, I did have to fabricate a seat for the relief valve due to heavy pitting. Now I need to dial it in.
My question is this, what is the maximum pressure that the pump should produce? Right now I have 85-90 psi "deadhead". That sounds way too high - I'd get about 300 lbs force from the cylinder.
Thanks - Any help is appreciated.