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post #11 of 12 Old 05-30-2011
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Buy a pressure guage, and run the engine. You will see if the pressure drops, or not. As typed it could be the sending unit itself, and a mechanical guage will verify the pressure.........i2f

20 MPH ain't fast unless, you do it in a 1000sq 3/2 house on 10foot waves
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post #12 of 12 Old 05-31-2011
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My suggestion is based on former car trouble. I replaced the timing chain and would subsequently lose oil pressure over 50mph. My conclusion was that I had dropped a shred of gasket into the oil pan and it was being sucked onto the oil pickup screen. Lowering speed would clear the problem. It's been years, but I think I cleared it with an oil change. Of course the drain hole on the V8 was larger than that on your boat engine. I knew for sure that it was a real drop because the hydraulic valves would knock when the pressure dropped.
I don't think the po's analysis is right. You're motor would have to lose a lot of oil through a mechanical fitting to cause a pressure drop.
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