A good general rule for oil pressure is 10 PSI per 1000 RPM when up to operating temperature. So if you have 22 PSI at running speed, warmed up, and have 5 PSI at idle, you are good.
Originally that engine was probably supposed to run 30 weight in the summer, 20 in winter (just a guess). That was before multi grade oil was invented. Most now run 15w40 diesel oil in the old engines. Maybe drop down to 10w40 if you use it in really cold weather.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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