I can sympathize with Hugh, that mark on the flywheel can be a bear to find if there's any of the usual scale and crud to be expected down there.
The mark on the flywheel is a fore-and-aft line from the ring gear to the front edge of the flywheel, marked with T-C and 1-4. It's not marked very deep. Get the motor to TDC as best you can from the top, by eye or using a stiff wire or screwdriver through the plug hole and riding on top of the piston as an indicator. At that point the mark should be very near the bottom of the flywheel. Dead bottom for the mark is TDC on the piston.
The flywheel mark should align with an indicator on the back of the lower cover, the almost-half-moon cast piece covering the lower part of the torque tube, ahead of the flywheel. Depending on the year of the tractor, the indicator will be either a very nice piece of steel tapered to a point, or a simnple nub on the inside of the casting.
The only place to look is through the oval (some are round) handhole on the underside of the torque tube/bell housing. A bright flashlight will help. With the right light, you could also get some better light in there by removing teh lower cover and going in that way, at least to find the mark.
Once found, you're on the right track. Clean it up and mark it with paint. Couldn't hurt to mark the indicator on the cover as well. Once marked, it is pretty easy to see though the hand hole.
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