Mercury 6E5Z-1177-C 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 with the vehicle in Neutral, and record 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 two-pin spanner to hold the pinion flange while loosening the locknut, then take off the companion flange using a puller that can attach to the flange's driveshaft bolt holes. Pry out the seal with a screwdriver or seal removal tool without damaging the seal bore, then remove the seal deflector and use a seal-puller to take out the pinion seal. With the seal removed, take out the collapsible bearing spacer and install a new one. 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 in 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 new 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 figure. If the original torque reading is exceeded by more than three in-lbs, the assembly will need to be disassembled again to install a new collapsible spacer. Finally, connect the driveshaft, add the specified lubricant to the transfer case, and lower the vehicle, ensuring that all driveshaft flange and support bearing bolts are replaced with new fasteners.