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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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