Having been through a couple of diesel conversion exercises, I can tell you that pretty much EVERYTHING between the front bolster and the bell housing is different from gas to diesel.
This being a frameless tractor brings a whole new set of problems. On a tractor with frame rails, all you need is the correct front cover and rear cover for the engine and it will bolt right in. With no frame, the engine is what's holding the tractor together. You need to find out if the D239 block in the swather is the same block used in the tractor. The tractor block may have extra reinforcement, or special mounting points for the front bolster, cast in.
You're going to need the rear cover for sure, along with a flywheel and a whole different clutch. I'm guessing front cover also.
The radiator may be different too. IH liked to have the bottom outlet on one side for gas and on the opposite side for diesel.
Gas tank, throttle linkage, and wiring are the LEAST of your worries, and the easiest problems to overcome.
Ideally you will want a junk 574 diesel sitting in the next bay to harvest parts off of for your conversion...
If it's supposedly just the harmonic balancer on the gas engine, why don't you just replace it and get the gas engine running? Frankly, I think the whole harmonic balancer line is a bunch of baloney... Hope you didn't pay much for the tractor.
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