Are you using the AE-L button to meter the shots in manual mode? All my old manual lenses (no "A" settings) have been working great. If it helps this is what I have been doing. I have the camera set to "permitted" for the aperture ring. In manual mode, compose shot, select aperture, then press AE-L button to meter the shot. The camera stops down the aperture then selects the shutter speed for you. If this is acceptable, then take the picture. So far this has been a really accurate way to shoot for me. As already stated, in Av mode the aperture is wide open no matter what the ring is set at (for non "A" lenses).
HTH
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