The first question is: does the new engine make more power than the old one did when it operated correctly? If yes, that may be the answer in a nutshell. It takes burnt fuel to make heat. It takes good injection timing, and expansion control, to turn it into work. Residual heat in the stack is waste. Exhaust valve timing, and back pressure can both affact the amount of heat in the stack. If the tractor is making more power than before, and no other changes have been made I would do the cooling system analysis first. Particularly the heat gun analysis of the radiator. Thermal analysis can also show restrictions in hoses, but not as easily. Thermostats that fail to open fully, and internally collapsed hoses are also possible. If these are sound and checked off, I would just swap the exhaust. It is not a 5 minute change, but running close to the edge is not in the best interests of a long engine life. Jim
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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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