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If it is that the oil is not returning through the governor, it should be a simple thing to check. The oil comes in via an elbow drilled-and-tapped into the back of the governor housing. It runs back into the crankcase via great big holes in the front of the governor assembly, whereby it runs down into the timing gear chest and so back to the sump. However, I suspect that your blockage - if you have one - is not in the governor, but in the oil filter standpipe. The oil comes into the filter housing via the center standpipe which has two rather small holes in it, about halfway up or a little more. It then flows out through the filter and out through a fitting in the side of the can and so off to the governor housing. The holes limit the flow and thus raise the pressure upstream. They also keep the pressure differential across the filter low, otherwise the pressure would blow holes through the filter medium, which is only paper. The standpipe holes are easy to block or restrict with rebuild debris. That being said, some parts of your description still do not make sense. If the oil-pressure relief valve is working correctly, the motor should never be able to make more than 35psi of oil pressure - any more and the OPRV will just lift off. Are you saying that you see very high oil pressure on the gauge? As Mark Hendershot describes, it's very unlikely that the motor is shutting down just because the oil pressure is too high. Once that motor is running, if the load of the oil pump is too great, it will shear off the pump drive gear before the motor will stop. I suspect that you have no oil flow to speak of anywhere in the system, and that motor is stopping for lack of lubrication - what we call "seizing up". You'll need to post more symptoms so that a plan of diagnosis can be made. HTH llater, llamas
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