KD Tools 3296 Ford Fan Clutch Wrench Set for 6.9- and 7.3-L Engines Fan clutch wrench set removes and replaces thermostatic fan assembly on Ford 6.9- and 7.3-liter engines Use with 1/2-inch square drive tools and torque wrench Long and short wrench openings: 48 millimeters and 83 millimeters Not to be used with power tools Lifetime warranty