Deere 2640 engine

Need to replace engine in 2640 tractor. Engine is a 4276D. Will any 300 series work. Is an engine out of an air compressor a workable choice. Are there structural and non-structural 300 series engines and if so how to tell the difference. Frank
 

What's wrong with the current engine? hole in block,spun main brg or something else? Yes some power unit application block aren't strong enough to support the frt axle. 2640 used a 276 cid engine which IIRC is the largest displacement 4 cyl 300 series engine JD built
 

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