That mark can be the very devil to find, as the flywheel tends to get covered in oil, crud, grime and rust, obscuring a mark that wasn't stamped very deeply in the first place. I never heard of there being an arrow.
Hugh's method will work just fine for timing. If you want to find the mark in any event or just to confirm that you've done what he described correctly, try this.
Pull it around to TDC as Hugh described. For timing you definitely want it to be on the compression stroke. For the sake of finding the mark, it can be on either. If it's even there, take the cover (usually oval, sometimes round) off the hole on the underside of the torque tube. Also remove the half moon cover on the front of the torque tube, the one with the timing mark on it. All for the sake of getting more light in there and having two places to look.
The mark you are looking for is a line that runs fore and aft on the flywheel, from the ring gear forward. Working through the bottom hole, clean up a little with a brush and a dry cleaner (like brake cleaner -- nopthing that would be a lubricant or leave a residue) on either side of the bottom of the flywheel at that point and it will eventually become visible, bit by bit. You can also try giving a look at the front edge of the flywheel from where you removed the cover there. Pursue anything that looks vaguely like a notch in the edge of the flywheel within a few degrees of bottom.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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