Drop the pan and check that the pickup tube isn't sucking air. If not you'll have to replace or rebuild the oil pump. You might have to take off the front axle to drop the pan, I got lucky and didn't on mine, but that is the standard procedure. As I recall the pump sits on the front side of the engine and mounts as one of the crank bearings (a one piece unit, along with the pickup tube). Supposedly you need to line bore the crank bearings for the engine if you replace the whole unit, so you'd be better to just rebuild it. I didn't when I replaced it with a Ford OEM unit back in about 1994 or so and haven't had any issues with it (sometimes you get lucky). The wear on the rod and crank bearings have some effect on pressure too so it they are bad you'll probably still have lower pressure. Don't expect very high pressure, if you get 20 - 30 when hot you are OK (I had zero before replacement!).
Go to the Ford 9N,2N,8N forum here on YT for advise on a rebuild.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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