I know from experience on my '68 4020 gas. First thing tried a pump from NAPA. Came with the wrong fittings for the bypass line, no good way to connect it. Sent it back asked for the right one. None to be had, none in the "system" of that model.
So I bought the rebuilding kit and put it in carefully. Mounted the pump, soon as I filled the radiator, it passed water faster than before. So I pulled it apart. I had crunched the ceramic seal ring.
Took it to a Deere shop. By then I'd also bought a new pulley since it was badly worn. Their guru put it together in a couple minutes. And NO measurements. I got in the truck and tried the new pulley. It had an air space at the flange when the pulley hit the casting solidly. Back to the Deere shop. Gear puller attachment for the press was broken so it took an hour to pull the flange out a quarter inch with an ordinary gear puller and pieces.
Got it on the tractor (by now I've decimated the dealer's supply of water pump gaskets), wouldn't turn because the impeller was against the block. Took it off. pushed the impeller on a bit and made a new gasket from heavier gasket material. Worked fine ever since. Yes it turned more stiffly, but clearing the block was an absolute necessity. Also after that last built, I clamped it to a flat metal sheet with a gasket and filled it with water and watched it for a week to see if it still leaked.
But it was a long hassle and I did all the pump swaps with the radiator in place. Working past the spot where the alternator had been, taken off for the water pump change. I hope to not do any more 4020 water pumps. I left flesh from my right hand in the radiator.
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