Posted by Bob Huntress on February 13, 2008 at 21:27:44 from (65.4.218.195):
In Reply to: 1947 8n oil pressure posted by william Edester on February 13, 2008 at 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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