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Tractor Talk Discussion Forum

1947 8n oil pressure

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william Edester

02-13-2008 20:04:44




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I have a 1947 8n ford. The problem since I have owned it is the oil pressure is at 40 psi when started and when it warms up it drops to O. It must be getting oil because I have plowed with it and had no problems as to engine noise. the motor runs like new. Also I keep having brake problems due to oil getting on the shoes, it is not too full with grease. I have replaced both grease seals. I use 30 weight oil in the motor. Thank you for any help

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Bob Huntress

02-13-2008 21:27:44




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 Re: 1947 8n oil pressure in reply to william Edester, 02-13-2008 20:04:44  
Oil pressure is used to give us an assurance that we are getting oil flow. The flow of oil is what actually is lubricating your engine. Because the tight spaces that oil must pass, there is an obvious resistance to flow, which is the oil pressure read by your oil pressure gage. As your engine wears over time, the spaces that the oil must pass become less tight, hence less oil pressure. Your oil pump, believe it or not, wears at a slower rate then your crankshaft bearing, for instance, therefore your flow may not have deminished nearly as much as your pressure. I mention this because you allude to the fact that you have been operating your tractor for sometime like this, without seizing your engine or throwing a rod, YET. Changing your oil to a 20w-50 may result in a minor increase in pressure, but it sounds like you're due for an engine overhaul. You may want to check your compression. Unlike when checking for a blown head gasket, you are looking for a consistantly lower compression across most of your cylinders. Also observe whether you have blueish smoke in the exhaust. Let me know what your compression test reveals.

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Ultradog MN

02-13-2008 20:18:36




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 Re: 1947 8n oil pressure in reply to william Edester, 02-13-2008 20:04:44  
william,
You found your way to the tractor forums.
Good start.
Ask your 8N questions over on the N board.
They're a bunch of helpful fellows there who collectively know more about your tractor than Henry Ford and Harry Ferguson put together.



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