As stated International had nothing to do with the Sheppard conversion engine.It was designated model 6M by Sheppard,it was a 3 cylinder,indirect injection Diesel.Sheppard also made 4 models of tractors.The SD-1,SD-2,SD-3 and SD-4.The SD-1 is the rarest of all with production believed to be less than 20.Wendel Kelch ones one of these.SD-2 and SD-4 production was around 200 each.The SD-3 was the most common of the Sheppard tractors wsith production of less than 2000.The 6M conversion engine was designed to fit the M chassis,and had very little in common with the SD-3 tractor engine.About the only interchange of parts were the pistons and injectors.Block,heads,crank,inj. pump,etc. were different from the SD-3 engine.The early 6M conversions actually used a timing chain and the later ones had gears.Sheppard never Nebraska tested their tractors,so hp estimates are sketchy.Sheppard rated their tractor as "2 plow" or "3 plow"or "4 plow" tractors.The story is the SD-4 was sent to Nebraska for testing to try to compete with the John Deere 70 for sales.Supposedly the Sd-4's hp. numbers would't compare to the JD,so it was withdrawn from the tests and never certified.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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