TC - If your M has a live pump the most probable cause is a failing camshaft drive gear. Typically the web between the gear teeth and hub fractures, or the cam gear retaining nut loosens/falls off.
The gear will still drive the cam more or less in time - so the engine will still run. But you'll hear a slap or clunk twice every crank revolution as the gear "flops" fore and aft inside the timing cover.
Repair is straightforward - I've replaced several Super M/400 cam gears. However there's some heavy parts must be removed (entire front end/bolster assembly) to get at the timing cover. Also the nut on the the front of the crankshaft must be removed. The nut is BIG and located in a recess. It requires a 2-1/2" socket - a size not usually in the average M owners toolbox!
However before you tear the tractor apart carefully check also the fan blade/water pump assembly. A loose fan blade or failing water pump bearing can cause ominous sounds at the front of the engine too.
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