Mercury YL8Z-1S177-AA Seal

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Raise the vehicle and support it securely on jackstands, then drain the transfer case lubricant. Remove the driveshaft and mark the relative positions of the pinion, nut, and flange. Use a beam or dial-type inch-pound torque wrench to determine the torque required to rotate the pinion, recording it for later use. Count the number of threads visible between the end of the nut and the end of the pinion shaft, and record that as well. Remove the flange mounting nut using a chain wrench to hold the pinion flange while loosening the locknut, then take off the companion flange, which may require a small puller for removal. Pry out the seal with a screwdriver or seal removal tool, taking care not to damage the seal bore. Lubricate the lips of the new seal with multi-purpose grease and tap it evenly into position with a seal installation tool or a large socket, ensuring it enters the housing squarely and is tapped to its full depth. Align the mating marks made before disassembly and install the companion flange, tightening the pinion nut if necessary to draw the flange into place. Carefully tighten the nut until the original number of threads are exposed and the marks are aligned, then measure the torque required to rotate the pinion, tightening the nut in small increments until it matches the previously recorded figure. Finally, connect the driveshaft, add the specified lubricant to the transfer case, and lower the vehicle.

Raise the vehicle and support it securely on jackstands, then drain the transfer case lubricant. Remove the driveshaft and mark the relative positions of the pinion, nut, and flange. Use a beam or dial-type inch-pound torque wrench to determine the torque required to rotate the pinion, recording it for later use. Count the number of threads visible between the end of the nut and the end of the pinion shaft, and record that as well. Remove the flange mounting nut using a chain wrench to hold the pinion flange while loosening the locknut, then take off the companion flange, which may require a small puller for removal. Pry out the seal with a screwdriver or seal removal tool, taking care not to damage the seal bore. Lubricate the lips of the new seal with multi-purpose grease and tap it evenly into position with a seal installation tool or a large socket, ensuring it enters the housing squarely and is tapped to its full depth. Align the mating marks made before disassembly and install the companion flange, tightening the pinion nut if necessary to draw the flange into place. Carefully tighten the nut until the original number of threads are exposed and the marks are aligned, then measure the torque required to rotate the pinion, tightening the nut in small increments until it matches the previously recorded figure. Finally, connect the driveshaft, add the specified lubricant to the transfer case, and lower the vehicle.