It does sound kinda odd that there's no water pump.
I don't know how familiar you are with the 113/123 motor you've got, so forgive me if I'm telling you something you already know. That's not my intention.
The water pump on the motor, if it's there, is not behind the fan in the middle of the block like most auto water pumps. It's actually at the inlet to the block, connected to the lower radiator hose. A motor without a pump will have a straight inlet there.
If there's a water pump, look at your belts. The rear belt should run straight between the fan pulley and the generator. The front belt, if there is NO pump will run from the crank pulley to the fan and no where else. If there IS a pump, it will be a longer belt that runs between the pulleys on the crank, the fan and the water pump. Standing by the generator and looking, if the forward belt is angled out toward the left side of the tractor and runs close to the inlet to the block, it will be running around the pulley on the water pump.
Another clule would be the brace that holds the top of your generator. With no water pump, that brace will be a straight piece of steel with a slot in it. If there's a water pump (or used to be) that brace will have a curve to it.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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