I cad see you lads have about got this tractor worked out. The UK built B450 used a glow plug start diesel engine with the same bore and stroke as your SMD. Itput out 52hp at 1450 rpm and drove a 5 speed gearbox just like a M with no TA and ind pto. They took a lot of starting on a cold mornind they got called Doncaster disasters. I used to work one with an IH B55T baler. Many engine parts are still available here in the UK and i would think you could make a M bonnet fit. MJ
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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