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All Fuel 630

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Dick N.

05-22-2002 12:36:40

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I recently read about a 630 Hi-crop all fuel engine. What is an all fuel engine? Thanks for any information.

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G-MAN

05-22-2002 13:43:41

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Re: All Fuel 630 in reply to Dick N., 05-22-2002 12:36:40

An all-fuel engine is what Deere called their distallate burning tractors. These tractors started on gasoline and ran on that until warm enough (about 190 degrees coolant temp) to switch over and burn kerosene/distillate/tractor fuel. Way back in the day, these fuels were much cheaper and easier to get than gasoline. At one time in it's history, gasoline was even considered a waste product of the refining process and nobody wanted it. Anyway, all-fuel tractors have lower compression ratios than gas burners - around 4:1 give or take. However, they made comparable power because those heavy fuels had more BTUs per gallon than gasoline. The easiest way to tell an all-fuel Deere is to look at the manifold - if the intake and exhaust are kind of all tied together in one unit, it's probably an all-fuel. Another way is to look at the gas tanks. If it has two fuel caps, it's probably an all-fuel, although I think some gasoline burner As still had both tanks and lots of all-fuel tractors were converted to gasoline operation with higher compression pistons and "cold" manifolds (intake and exhaust separated). This probably isn't the most technically accurate explanation of all-fuel tractors, but it will give you a basic idea.

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