First one?
http://www.wright-brothers.org/Information_Desk/Just_the_Facts/Engines_&_Props/1903_Engine.htmAfter the castings had been made the Wrights "mechanician," Charlie Taylor, machined the parts and assembled the engine. He later described his work:
"We didn’t make any drawings. One of us would sketch out the part we were talking about on a piece of scratch paper, and I’d spike the sketch over my bench. It took me six weeks to make that engine. The only metal-working machines we had were a lathe and a drill press, run by belts from the stationary gas engine.
"The crankshaft was made out of a block of machine steel 6 by 31 inches and 1-5/8 inch thick. I traced the outline on the slab, then drilled through with the drill press until I could knock out the surplus pieces with a hammer and chisel. Then I put it in the lathe and turned it down to size and smoothness.
"The body of the first engine was of cast aluminum and was bored out on the lathe for independent cylinders. The pistons were cast iron, and these were turned down and grooved for piston rings.
"The completed engine weighed 180 pounds and developed 12 horsepower at 1,025 revolutions per minute. [It actually produced nearly 16 hp when it was first started, by this dropped to 12 hp as the engine heated up.]"