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I have a 641Diesel with lots of hours on it. It has good power and starts fairly easily, but has quite a bit of blow-by and I cannot seem to stay ahead of the various oil leaks. The oil pressure gauge reads somewhat over 20 pounds pressure when the machine is hot and working hard, but as long as I make sure that the oil level never gets beyond 2 quarts low, it never goes below 20 pounds pressure at idle or at any higher engine speed. I have had this tractor for about 15 years, and the oil pressure has stayed about the same. I use 20W50 oil in the 641D, as the hot pressure is a little better than with 30W. I use the 20W50 year-round, but do not try to start the engine without first heating it up for awhile with the electric lower radiator hose heater--I think it is too hard on the electrical system and possibly the oil pump drive to turn it over in extreme cold. It always starts very easily if the heater has been on for an hour or so, even below zero F, and the oil pressure on the gauge comes right up. I know that sometime I will need to rebuild the engine--my hour meter was over 9000 when it quit working years ago. But as long as the tractor keeps working as well as it has been, I will just keep checking the oil and adding some as it is needed. BTW I am in the market for a rebuildable 172 diesel engine that is not too far away from Spokane, WA. I think I could use the head, injector pump and injectors from my 144 diesel engine, as well as all the external parts. Good luck with your engine. I would try running somewhat heavier oil to see if the hot pressures are better. But be careful if you need to start it in extreme cold.
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