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Some more straws to grab at.
Do you ever watch the tv show House. This is beginning to be a real mystery and diagnostic who what done it. The Pump is a simple device the clearances are easily checked as in the service manuals along with a visual inspection. The difficult part to inspect is the plate it's self. First Is the pump staying dry, as no sign of any oil being pumped? If yes look from the pump to the pan. If some oil is at the pump obstructed manifold. The manifold would be the cam plate. This thing is cnc milled and drilled. You can try to remove the construction plugs the pipe plugs these cover where cross drilling takes place to connect the drilling's together. Think of it as a circuit board. I have found when inspecting hydraulic manifolds being able to push through pipe cleaners ( the thing to clean out the tar from Grand Dads pipe) through the ports and looking to see if the holes in fact connect. Lets say a drill slipped in it's Colet when the machine was set up and too short to drill deep enough. You should be able to trace each drilling in the circuit to verify. Blowing air through the holes might also help. Dose this motor have a Oil cooler? Hoses backward possible check valve in circuit. I have been looking at the original cam plate off mine the relief relief valve short circuits directly back to the pump inlet. If this seal is not good it would circulate air much easier than oil and could stop the pump from priming. There is another drilling that runs up to the oil filter after that it comes back to lube the cams lifters and the rest of the motor. The drilling in the engine case for the oil pressure switch is on the inlet side of the oil filter. If that switch is left out it should have full oil flow and pressure.
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