Ford BR3Z-4676-A Seal Assembly - Oil

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Raise the rear of the vehicle and place it securely on jackstands. Remove the rear wheels and brake drums. Mark the driveshaft and companion flange for ease of realignment during reassembly, then remove the driveshaft. Mark the relationship between the pinion and companion flange. Using an inch-pound torque wrench, measure and record the torque required to turn the pinion nut through several revolutions (pinion bearing preload). Using a suitable tool, hold the companion flange and remove the pinion nut. Using a suitable puller, remove the companion flange. Pry out the old seal with a slide hammer and reversed jaws or other appropriate tool. It may also be removed with a hammer and chisel. Clean the oil seal mounting surface. Tap the new seal into place, taking care to insert it squarely. Inspect the splines on the pinion shaft for burrs and nicks. Remove any rough areas with a crocus cloth. Wipe the splines clean. Install the companion flange, aligning it with the marks made during removal. Gently tap the flange on with a soft-faced hammer until you can start the pinion nut on the pinion shaft. Using a suitable tool, hold the companion flange while tightening the pinion nut to the minimum torque. While tightening, take frequent rotational torque measurements, using the inch-pound torque wrench, until the measurement recorded is reached. Caution: If the measurement recorded was less than the pinion bearing preload torque, continue tightening until the specified torque is reached. If it was more than specified, stop when the specified torque is reached. Under no circumstances should the pinion nut be backed off to reduce pinion bearing preload. Increase the nut torque in small increments and check the preload after each increase. Reinstall the driveshaft, brake drums and wheels. Check the differential oil level and fill as necessary. Lower the vehicle and take a test drive to check for leaks.

Raise the rear of the vehicle and place it securely on jackstands. Remove the rear wheels and brake drums. Mark the driveshaft and companion flange for ease of realignment during reassembly, then remove the driveshaft. Mark the relationship between the pinion and companion flange. Using an inch-pound torque wrench, measure and record the torque required to turn the pinion nut through several revolutions (pinion bearing preload). Using a suitable tool, hold the companion flange and remove the pinion nut. Using a suitable puller, remove the companion flange. Pry out the old seal with a slide hammer and reversed jaws or other appropriate tool. It may also be removed with a hammer and chisel. Clean the oil seal mounting surface. Tap the new seal into place, taking care to insert it squarely. Inspect the splines on the pinion shaft for burrs and nicks. Remove any rough areas with a crocus cloth. Wipe the splines clean. Install the companion flange, aligning it with the marks made during removal. Gently tap the flange on with a soft-faced hammer until you can start the pinion nut on the pinion shaft. Using a suitable tool, hold the companion flange while tightening the pinion nut to the minimum torque. While tightening, take frequent rotational torque measurements, using the inch-pound torque wrench, until the measurement recorded is reached. Caution: If the measurement recorded was less than the pinion bearing preload torque, continue tightening until the specified torque is reached. If it was more than specified, stop when the specified torque is reached. Under no circumstances should the pinion nut be backed off to reduce pinion bearing preload. Increase the nut torque in small increments and check the preload after each increase. Reinstall the driveshaft, brake drums and wheels. Check the differential oil level and fill as necessary. Lower the vehicle and take a test drive to check for leaks.

Loosen the wheel lug nuts. Raise the front or rear of the vehicle and support it securely-on jackstands. Block the opposite set of wheels to keep the vehicle from rolling off the stands. Remove the wheels. Disconnect the driveshaft from the differential pinion flange and support it out of the way with a piece of wire or rope. Rotate the pinion a few times by hand. Use a beam-type or dial type inch-pound torque wrench to check the torque required to rotate the pinion. Record it for use later. Mark the relationship of the pinion flange to the shaft then count and write down the number of exposed threads on the shaft. A special tool or a chain wrench can be used to keep the companion flange from moving while the self-locking pinion nut is loosened. A screwdriver or long punch inserted through one of the holes in the flange can also be used to immobilize the flange. Remove The pinion nut. Withdraw the flange. It may be necessary to use a two-jaw puller engaged behind the flange to draw it off. Do not attempt to pry or hammer behind the flange or hammer on the end of the pinion shaft. Pry out the old seal and discard it. Lubricate the lips of the new seal and fill the space between the seal lips with wheel bearing grease, then tap it evenly into position with a seal installation tool or a large socket. Make sure it enters the housing squarely and is tapped into its full depth. Install the pinion flange, lining up the marks made earlier. If necessary, tighten the pinion nut to draw the flange into place. Do not try to hammer the flange into position. Apply a bead of RTV sealant to the ends of the splines visible in the center of the flange so oil will be sealed in. Install the washer and a new pinion nut. Tighten the nut until the number of threads recorded earlier are exposed. Measure the torque required to rotate the pinion and tighten the nut in small increments until it matches the figure recorded earlier. To compensate for the drag of the new oil seal, the nut should be tightened a little more until the rotational torque of the pinion exceeds the earlier recording by 5 in-lbs. Reinstall all components removed previously by reversing the removal process, tightening all fasteners to their specified torque values.

Clean the oil seal mounting surface, then tap the new seal into place, ensuring it is inserted squarely.