Combines need info on N7 516 motor urgent

I have a 1981 N7 w_ 3500 engine hrs. and not a minute of trouble from the engine. Can't say that for some of the 426's I've had. loaded w_ power but does like the fuel.

local salvage yard had a 516 from an N7 a couple years ago and they didn't recommend me buying it as a replacement for my N6 426cid. I was told that it is quite a feat to convert the 426 combine engine to the 516, belts, sheaves, water lines, hydraulic pump and lines, and the list goes on. Before you buy, make sure you know the complete cost and changes that need to be done to the base machine. The Cummins retro fit is a much better match from what I have seen and heard. Good luck!

Kirk, Frame rails are different on N7 to N5.Radiator is larger on N7 and I don't think you will be able to keep her cool,let alone keep enough fuel bought ahead to feed its thirsty appetite.Usually you can figure 12-15 gal. hour whether running loaded or empty.(Kind of like a 454 Chevy,GM says 2-4 mi_gal. is acceptable.)Cummins will consistatly be 7-8 gal._hr. max. I have yet to see a full fuel tank run empty after a long day(12-15hrs.).Fuel savings alone will pay for the Cummins in a few years depending on how many hours your running per year.Don't get me wrong,N7 engine is reliable,but replacement parts are expensive if it goes down. Food for thought, Hyper Harvest II

I had a 1981 N7 that I put 5500 hrs. on. During that time I only had to replace a head gasket. I would rate the 516 [11000 series] engine one the best Allis-Chalmers engine ever used. Just wish they would have put it in the 8070 tractor. This motor only turned 2200 rpm's in the N7. I think it was rated at 270 HP. Horsepower was never lacking.The torque was there. You may need the N7 radiator also. Good luck.