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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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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