Mercury E3TZ-7052-B Seal Assembly - Oil

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Raise the vehicle and support it securely on jack stands, ensuring that if equipped with Automatic Ride Control (ARC), the air suspension switch is turned to the OFF position to prevent damage to the system components. Place a drain pan under the extension housing, as some transmission lubricant may drain out when the driveshaft slip joint is withdrawn. Remove the driveshaft. Use a seal removal tool to take out the oil seal from the end of the extension housing, being cautious not to damage the housing if using a thin blade screwdriver or chisel instead. Inspect the sealing surface on the driveshaft slip joint for any scoring or burrs that could damage the new oil seal, and replace the yoke if it is damaged. Check the extension housing bore for burrs and remove them with emery cloth or medium grit wet-and-dry sandpaper, then clean the bore with a cloth dipped in solvent. Apply silicone sealant to the outside diameter of the oil seal and multipurpose grease to the seal lip. Using a seal driver, large socket, or section of pipe, install a new oil seal, ensuring it is completely seated and square to the housing. Install the driveshaft, lower the vehicle, and check the transmission lubricant level, topping up if necessary.

Apply silicone sealant to the inside diameter of the oil seal and apply grease to the end of the rubber boot portion.

Raise the vehicle and support it securely on jackstands.

Install the output flange onto the output shaft splines.

Clean the transfer case front output female splines and apply multi-purpose grease to them.

Lower the vehicle and check the transmission lubricant level. Top up if necessary.

Remove the driveshaft. Some transmission fluid may drain out when the driveshaft universal joint is withdrawn from the extension housing.

Install the front yoke or rear flange onto the splines, then install the rubber seal, steel washer, and a new nut (snap-ring on the front yoke on later models). Tighten the nut to the torque.