Without a temperature gauge, how do you know that your engine is overheating?
The cooling system in an 8N is sized such that it is rare for the engine to overheat, ABSENT OTHER PROBLEMS, e.g., cracked head, leaking head gasket, retarded timing, etc.
That said, a fan shroud is needed to maintain adequate air flow through the radiator, especially at low RPM. Does your engine overheat at operating RPM? If so, though a fan shroud is recommended and, perhaps, helpful, lack of such is likely not the primary cause of your problem.
These days, most overheating problems with N series tractors are due to inadequate airflow through the radiator due to debris clogging of the core when mowing. Has your radiator been recored with an automotive type core? If so, you will ALWAYS have overheating problems when mowing as serpentine automotive type cores quickly clog with debris, restricting air flow. For anything other than a trailer queen you must have a flat-finned industrial type core. These days, such cores are more expensive than automotive type cores and radiator shops will not install such unless specified.
Moreover, even if you still have the OEM radiator, it is now over 60 years old and has likely been repaired many times. The quick and dirty way to repair leaks in a vintage radiator core is to simply pinch-off the leaking tube and solder it closed. If this has been done multiple times, the radiator is now undersized. Look for such evidence.
Be wary of aftermarket replacement radiators. Most have inexpensive, serpentine, automotive type cores, and are completely unsuitable for anything but a trailer queen.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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