|Ford 9N, 2N & 8N Discussion Forum|
Re: At what point do I decide to do a total rebuild?
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I learned the hard way , always pull the pan on one that has been sitting out side for years .
These motors have a poor oil filtering system (passive) that will recirculate dirt dobber nests and other contaminates that may stay trapped in one of the baffled chambers built into the oil pan until the oil gets to operating temperature .
An average oil filter will remove particles larger than about 20 microns , the bearing clearance should be about .003 to .005 but the screen if you even have one would let particles of about .030 pass through (762 microns ). The oil pump may grind up a large grain of sand or pass it through a few times first , after it gouges past the bearings .
It ain't a pretty site :(
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