Abilene Machine | John Deere engine-overhaul-kits Abilene Machine is proud to offer our FARMTUFF® Ag Replacement Parts for John Deere® Engine Overhaul Kits and much more. All of the FARMTUFF® Replacement Parts are made to meet OEM specifications and requirements. That means when you buy from Abilene Machine you can be rest assured that you are g.. JOHN DEERE 6/A - MAJOR ENGINE OVERHAUL KIT - LATE This is a Brand New Premium Quality Major Engine Overhaul Kit. It comes with a Full Manufacturers Warranty. It is for rebuilding the original John Deere 6/A - (LATE SERIAL NUMBER RANGE) Turbo/Aftercooled Series Diesel Engine in the following equipment.