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[Larry5150]

Originally Posted by cts1950

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.

Hi cts1950...
i`m going to tear it all back down one more time to look things over again. I will also go into the camplate, remove the plugs, an see if i can find anything wrong. I`m also gonna pull the pump all apart again too. Definately a mystery on somethin here. One of those 2 parts are sleeping an i just gotta wake`em up....lol. I`m NOT about to give up.... i`ve built hundred`s of motors in my lifetime, but i`ve never had a job fight me like this before... there is some little thing somewhere thats just not right and i`ve just not located it yet, is all. I will find the problem, it CAN NOT beat me....lol

As for your thought on:
The oil cooler... no, ther is no oil cooler. (great thought though...!)
Drill, Collet, Machining... good thought here too buddie. I am a CNC machinist by trade, so i know EXACTLY what your saying on that... i see this happen alot where i work, so anything`s possible.
Oil Pressue Switch... i took it completely out... no oil flow or pressure at all.
Each time i`ve had the pump out, the pump didnt look like it pumped any oil thru it at all... just the oil remains in it from when i put some in there on the installation of it. I think the problem may be between the camplate, at the pump, but not after the pump (if i`m reading the flow charts in the shop manuel correctly) I can hook up a vacuum pump to the oil tank hose`s, and oil fly`s right out of the hose, so i KNOW the oil can flow from the tank just fine.

I`m hopeing that someone from the MoCo is reading these forum`s...
maybe with a little help and thoughts on this matter, they will hopefully jump in here an throw some more idea`s at us.

As for YOUR, idea`s, dude, you an i think ALOT alike...lol.
You`ve came up with idea`s on the same level as i have....
i am very greatful for ALL the efforts and thoughts you`ve brought into this forum thread.

(larry)