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 numbers would't compare to the JD,so it was withdrawn from the tests and never certified.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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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