The picture I have sent.
Measurements width app. 4 1/8 @ window, 3 5/8 toward room, 1/2 thick @ window, 1/4 toward room, handle about 3 in. Long
My question was since I can only open the window about 1 1/2". Can I turn the crank and push on the window to open it completely?
Yes, try turning the operator handle and gently push on the window sash to open. You don't want to be to rough and damage the glass or frame on accident. I'm wondering if a screw in the hinge track is getting in the way of the operating of the window. That sometimes happens. Like Tom mentioned, look for any debris or obstruction in the track.