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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: 8N Ford Oil Pressure

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Author  [Modern View]
TheOldHokie

03-19-2013 14:09:58
71.176.179.17



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Jim R said: (quoted from post at 16:52:34 03/19/13) I recently bought a 1948 Ford 8N Tractor, my first old Ford Tractor. It is believed to have a fresh engine overhaul from a previous owner but not exactly sure what was done. I changed the oil and put in Rotella T 15W40 which I use in all my tractors. It seems like it takes a long time for the oil pressure to come up after starting it cold, especially in colder weather. Sometimes it may take as long as 15 seconds or so for the oil pressure to come up. Should I be using a lighter weight oil, or is this a common thing among 8N's. Thanks for any advise!


The flat head oil pump is not the strongest performer in the world but you should get a solid oil pressure indication almost immediately once the engine starts runniing. Even just cranking with the starter motor should move the needle. You have an issue and unless the temperature where you live is well below freezing it's not likely the 15W40 grade oil is your problem. Personally I prefer 10W30 for general year round use and you can try that just to see what if any difference it produces.

I always cringe when I hear somebody with a tractor for sale say "the engine was just overhauled". To me all that means is it wasn't working right and somebody tried to fix it. Maybe they knew what they were doing and maybe not.In your case it sounds like "not". In any event the first thing to do is determine if the oil pressure is really that slow to build or if the gauge is faulty.

You'll probably get at least one dissenting opinion but IMO any engine that runs for 15 seconds after start-up without oil pressure is rapidly digging it's own grave.

TOH
This post was edited by TheOldHokie at 14:14:51 03/19/13 2 times.

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