Timing chain tensioner leaking between block and tensioner is a good possibility . Scored camshafts can loose pressure . The pump may be worn for some reason . Those usually put out very good pressure . Do Not put 15-40 or any heavy oil in it , if it can't make pressure with 5w20 it has a problem . Check a rod and main towards the rear , cyl 7 or 8 rod and see if they look scored or scratched from debris . I would not use plasticguage as we were always told not to use it on these engines because clearance was so close it could crack a rod cap . The rods are compressed metal powder design and will break if not handled properly. It should be obvious when you look at the rod bearing if it is good or bad. I have had a couple that had rod knock from an obviously shot scored bearing but they still had good oil pressure. Unless the past owner really abused it those engines almost never have problems.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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