Unless you do a LOT of work, the C153 is it for engines.
IH didn't make that many 504's in the grand scheme of things, and they're not really the same as any other tractor... The 504 can't trace its heritage back to the A, C, H, or M.
If anything, it is descended from the 340, which was designed to fill the gap between the 240 (descended from the C) and the 460 (descended from the H).
The 544 came after the 504, but it has nothing in common with the 504, and the C200 engine is even rarer than the 504's C153.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
... [Read Article]
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