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JD4230 Low idle oil pressure after warms up since overhaul

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m walton

05-02-2002 06:53:02




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I just had my JD4230 engine overhauled. Since the overhaul I have this oil pressure problem. With the engine cold the pressure is 50 psi at 1800 and 850 RPM. Unfortunately the idle 850 RPM pressure drops to 21 psi after the engine warms up while the 1800RPM pressure only drops 2 psi to 48 psi. Should I be concerned? What could be the cause of this new development?




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Gpower

05-02-2002 07:03:29




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 Re: JD4230 Low idle oil pressure after warms up since overhaul in reply to m walton, 05-02-2002 06:53:02  
That is about normal for an engine that is overhauled. I assume that you have put in John Deere's break in oil, which is a 10w-30, or a light weight oil to ensure proper break in of ring seating. What happens is while the engine is cold the oil is thicker, as the engine heats up the oil gets thinner and your pressure drops. This is so that you can get the rings to seat properls and elimanate any blow by or oil consumption. You will notice up to a quart or two loss over 50 to 100 hours, this is normal as well. Have you put it on a dyno? If you havent, or have worked it at varying loads you can watch the blow by and see how it cleans up after the engine breaks in. Anyhow as long as it doesnt get down to 15-20 psi you are good to go. Gpower

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