If this is a Delco or any starter with the solenoid on top that pulls the plunger in, the problem is likely in the starter.
What happens, the solenoid pulls the drive into the flywheel, the spiral on the shaft takes over and extends the drive fully out to the end of the travel, against the thrust washer in the end of the nose cone.
That in turn pushes the plunger fully into the solenoid, and holds the button that closes the contacts in, keeping the starter engaged. Chances are once the engine fires it will kick the drive out, stopping the starter.
But that's not acceptable. The rebuilder either left the thrust washer out at the end of the drive, the nose cone is chewed away where the thrust washer rides, the plunger fork is in backward, wrong plunger, wrong drive... Something is mechanically not right.
To prove it is in the starter, disconnect the small wire from the solenoid that energizes the starter. Jump from the battery post to the small post, see if the starter continues to crank with the wire disconnected.
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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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