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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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