Series 1 D17 Diesel low oil pressure

Hey all I’ve got a 58 series 1 D17 Diesel. Fresh rebuild on the motor. Only thing not replaced was the rockers and the oil pump. All new bearings, camshaft bearings, rod bearings and main bearings. Cold start oil pressure is at the “L” in normal but by the time the engine reaches temp it’s in the middle of the non labeled section of the gauge. Also it’s a new 0-80 gauge and I’ve checked it with a numbered gauge as well. New oil pressure relief spring below the injection pump. With this once the oil is warm at full throttle I hear what sounds like a knock but I’m not able to pin point if it’s high or low. First I’d like to solve the oil pressure issue first and see if it goes away with that. I’ve got about an hour on the rebuild accord to my tach.

It is about the same. I can’t remember the part number off the top of my head but they had STD stamped in them. Had the crank measured and it was in spec for standard size so that’s what was put back in it.

All of it was plastigauged and checked out. I didn’t intend on overhauling. I had the low oil pressure and pulled it out to do a rear main and front main seals and found a crack in a sleeve so I overhauled it. I’ve replaced the spring under the pump and it seemed to help some. Not sure what condition the pumps in confidently but I removed the screen and it all looked okay but I’ve never seen what a new one looks like to say it’s wore out. Correct me if I’m wrong and I feel I may be but would my tolerances get tighter when warm vs cold thus making a knock at cold and not warm? Maybe I’m thinking of that wrong. I also checked the rockers while it was running and quite a few were pushing more oil around the rocker pivot than others. Some dropped some were a solid stream.

My series one D17 diesel has a factory style “Normal” gauge in it. New Agco gauges were installed when I freshened up the tractor 2 years ago. Engine has not been rebuilt that I am aware of. On cold start the gauge goes up to the A of the gauge, once it warms up and I’m sickle mowing for instance, it runs in the R or M of the gauge. Low idle it will drop back to N. With that being said, I was told that they are 60psi gauge. Sounds like it’s right in line with what Dr Allis is stating IMO.