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pilot1950

low oil pressure

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after hose replacement oil pressure would slowly drop from 40s to 20s.  oil levels ok. Aux pressure gauge confirmed engine gauge readings. What next. Oil regulator?

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First visually check the lines for the oil tank to the pump to make sure you don't have a kinked line. Especially the line the goes from the cooler to the oil pump.

Based solely on experience with other aircraft engines I would say to check the oil pressure relief valve for debris. It is possible that a little piece of something found its way to between the ball or mushroom and the seat.

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