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Brian G. NY
I mentioned the wider wheels, bigger carb. (and air cleaner pipe) and the elimination of the shutters. I think the only WD-45s that may have had shutters were the very rare dual fuel tractors. I missed mentioning the by-pass hose thermostat housing but that came on the WDs with the tall head back in '51 at which time they also dropped the 2 inlet water manifold.
I was not aware of the heavier ring and pinion set up so I learned something new there.
The distributer ignition began with the late WDs which I mentioned and they did have the cast aluminum housing.
Prior to that all the WDs were magneto ignition so all the early WDs you see with distributors will have the cast iron distributer "adaptor" housing.
You've got me wondering about the heavier wheel centers. Never heard of that before. I'm going to have to check out my tractors. I have a '50 and a '51 WD, two '55 WD-45s, a '56 WD-45 and a Series II D-17. The part numbers are the same for the wheel centers for the WD up thru serial #24000 of the D-17. That doesn't mean that the earlier wheel centers weren't lighter, only that all replacements ordered would be the heavier ones.
The same is true for new blocks, the replacement block supplied for both the WD and WD-45 was the new casting without the side plate after all the WD blocks were used up.
Like I said, I probably didn't cover everything.
Again, I say that some items thought to be WD-45 identifiers were actually running changes made to the WD and carried forward to the WD-45 model.
Thanks for your comments; it made for an interesting discussion.
Have a good day,
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