As ShaggyM says, it could be your oil pump. The pot metal bottom is notorious for bowing. Had to take .014 off of one to make it flat so the gasket would stay in place. You might make a reinforcing plate to go across the oil pump cover to keep it from bowing out. Don't know what the spec is, but with theoil pump in good condition and rod/main bearing clearances in tolerance, it should hold 30 to 40 psi hot and idling and 50 to 55 psi at full throttle.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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