The 400 carb will work okay, but I can still tell the differance between it and a SM carb. from several feet away because the idle air adjusting screws are in a different spot.Also the 362173 R91 and 92 don't have the nut on bottom of bowl that holds main discharge jet in like the SM. Original R91 carbs didn't have a high speed adjustment screw,just a plug in the hole. Also the main discharge jet, main jet or seat, and some passages are different between R91 and R92. IH sold a changeover kit to convert R91 to R92 after they went to the R92 carburetor. Carb was used on 450 also. A 400 distillate or kerosene carb is made like a SM carb.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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