Posted by JD Seller on August 04, 2019 at 21:22:43 from (208.126.198.213):
In Reply to: Low Oil Pressure posted by ramo77 on August 04, 2019 at 19:45:06:
Well The hours are more than likely not correct. Those tachometers just did not last long so it would be really rare for it to be the original. Also a 66 year old tractor only having 495 hours would make the tractor very valuable and in pristine condition not losing oil pressure when running at operating temperature.
The oil pressure your seeing is inline with a worn Ford motor of that vintage. With cam shaft driven oil pumps you see more of a difference between low and high RPMs. This is one reason most modern engines have crankshaft driven oil pumps.
Also I am not a big fan of multi grade oils in older motors. Especially ones with wear. I would try some straight 30 weight oil in the motor and see what that does. Now this is for summer usage. For winter go to a 10w30 oil. A 15w40 oils is more a diesel engine oil.
These old Ford motors where not long life motors. When farmers around here where using them hard, they would overhaul the motors every 3-4 years. An overhaul kit did not cost much and usually the crankshaft would be fine. Most farmers could do the majority of the work themselves. The trouble was most of these tractor only got inframe overhauls unless the rear seal was leaking. So the cam bearings were rarely changed. Motors with the type of oils system your tractor has you could very well have worn cam bearings causing the lose of oil pressure.
So change the oil from a multi grade one and run it unless you want to spend the money to overhaul it. To do it right could easily be $1500-2000 with machining and little outside labor. If you hire it totally done it easily could be $2000-2500.
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