Well, I ran the engine and the pressure came up to 120# and wavered there for about 15 minutes.

Prior to turning the engine off we bled the air down and the engine kept up with the loss.

When I turned the engine off, the pressure was about 117 and slowly ( very slowly ) fell to 70# and stayed there for a long time and about 3 hours later it stayed at 67.

I guess we have decided to wait before we replace the motor because we do not know the reasons for the irratic actions of the compressor.

I got thinking that the valves in the Norgrens would not leak when the pressure leaked down to, say 70#, and would seat. I know absolutely "zilch" about them. Maybe the reason for the cycling of the compressor was due to them not seating even at lower levels of pressure. There is really no place within reason around here where I could take this. Presently everything is quiet and aired up.