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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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