(quoted from post at 22:20:27 04/29/20) Nothing, all I mentioned is that I didn?t know what year it is it is a
diesel 800 jubilee
A "Jubilee" was a marketing name for the 1953 NAA & NAB model tractors because that was the Ford Motor Company's 50th anniversary, and any 50th anniversary is sometimes referred to as a "golden jubilee". The NAA & NAB models were only made from 1953-1954 and only the 1953 tractors were referred to as "Golden Jubilee" or "Jubilee" tractors. The 1954 model year tractors were just called NAA and NAB.
After that, starting in late 1954 for the 1955 model year they began making the "hundred series" tractors, there were the 600, 700, 800 and 900 series of tractors, and each series had various models that were differentiated by the middle digit in the model number, and the various models had different transmission, PTO and 3 point hydraulics options. In the 800 series there were several models, which were the 820, 830, 840, 850 & 860. None of the 800 series tractors were ever offered with a diesel engine. The hundred series tractors were not Jubilee tractors. Starting in 1957 for the 1958 model year they started making the '01 series tractors, the 501, 601, 701, 801 & 901 series. The '01 series were the first Ford branded tractors offered with a diesel engine. The '01 series tractors were not Jubilee tractors either.
So if your tractor has a diesel engine, it is not a Jubilee, and it is not an 800. It could be an 801 series, of which there were even more models than in the 800 series due to the addition of the Select-O-Speed transmission. The models in the 801 series were the 811, 821, 831, 841, 851, 861, 871 & 881.
Does it continue to run after you use starting fluid to start it? If so, then the problem is likely to be low compression, so I would do a compression test. Continuing to use starter fluid to start it will most likely damage the rings, and possibly the pistons, and cause it to have less and less compression over time until it won't even start with starting fluid.