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| Your salvage yard is correct. 4010 and early serial number 4020 tractors used the flat face crankshaft/flywheel connection. With the intro of the 4520 in 1969 the machining for the higher horsepower parts were also used in the 4020 engines. Later when the 466 engines bumped the horsepower more they added 2 more bolts in the flange. 4010,4020E AND 4020L all use the same dampner assembly which I would recommend that you replace. Hope this helps. | |
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JD 4020 Crankshaft
