sounds like a loss of oil as you said. Could be the pump, could be excessive clearance in pump/ relief that caused loss of pressure, or could be BAD FILTER.. A few years ago there were some bad filters made that caused the loss of pressure and problems as you have. Those filters were paper and high volumn filters instead of packed cotton, low flow... YOu may not know, but the lube system is very different than a car. Pump puts out a fixed volumn. 15% of that goes thru the compressed filter, cleand and dumped back to sump. 85% of the oil goes from the pump, down thru the cam shaft and distribute by spray to the bearings (and thru the copper line to the top end)... If you have a filter that is BAD and flows excess oil easily, then too much flow goes back to sump and not enough thru the cam and to the bearings. AS you can tell from the above, excess bearing clearances from years of use do not cause drop in pump pressure.
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