Main bearing jurnal on crankshaft is bad. Same problem as you have but it was a Ferguson TO30. Bought with good oil pressure when looked at and bought but when warmed up working no pressure. It was only one spot on crankshaft and as being a main no noise like a rod would have. Ended up thecrank was ground, only supposed to go to 3000 under but to get it to work had to do 4000 and it was good for several years before I traded it off. Been too many years to remember for sure but only part of the jurnal was worne away, and a rib of correct size still on the shaft. I am thinking the rib was on center of bearing with both sides gone. So part was still tight and could not be detected even with pan off, had to take the bearing caps off and problem was as plain as day or night. I had bought it at a dealer but a different shop did the work, close and Dad went to school with the owner of the shop that was the Ferguson dealer. The Dealer I bought the tractor was a Ford tractor dealer quit a bit away but they did have the crank turned. This was in the mid 60's.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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