Mercedes-Benz Sprinter - Seal the axle drive | W906

Heavy oil leakage with drip formation on drive flange of axle on Sprinter up to 3.5 tons. In order to eliminate the leak, replace the radial shaft sealing ring and coupling flange. Remove the wheels. Detach the brake jaws slightly from the brake disk so that the axle can move freely. Loosen the drum parking brake slightly. Detach the propeller shaft. Remove the 4 bolts to do so. Secure the propeller shaft with a cable tie at a suitable point. Drain the transmission oil from the axle gear. First check the gear for defects manually without using tools. Foreign objects in the oil provide an initial indication of defects and can be tested with your finger at the outlet. Another indication of a defect is a rough running bearing or axial play. If damage is found, the entire axle must be replaced. Reseal the oil drain. Use the correct torque of 60 Nm and turn the bolt 90 degrees further. After repair, the axle must have a friction resistance ... ... 0.1 Nm to 0.3 Nm above the value measured here. Determine the friction torque now. After the fifth revolution, read off the value while turning. Maintain a speed of roughly one revolution per second. In this example, the friction value is 1.4 Nm. Note down the measured value for checking after the repair. Remove the radial sealing ring. Remove the retainer for the 12-point nut and open the nut. Important: Do not use an impact wrench on the 12-point nut. Do not use one for the rest of the installation procedure. Otherwise the axle gear could be damaged. A retainer wrench in combination with a torque wrench can be used to unscrew the nut. Remove the coupling flange on the drive pinion with a puller. The radial sealing ring is exposed and can be taken out. To do so, knock the ring on one side with a drift ... ... so that the tension of the sealing ring is released in the seat of the housing. Pry out the radial sealing ring with a suitable tool. Do not damage the bearing behind it. Do not clean the sealing ring, return it for investigation as removed. Also send in the coupling flange as removed. Clean the seat of the sealing ring in the housing and the end face of the tapered roller bearing ... ... before installing the new radial sealing ring. A drift is needed to knock in the ring uniformly and flush with the housing. This prevents the ring from tilting. Use your finger to check whether the sealing ring is seated completely flat. This is extremely important so that the ring seals properly later. Install a new coupling flange and ... tighten the 12-point nut with an initial torque of 30 Nm. The shaft must have no axial play afterwards. Check this with a dial indicator attached to a magnetic mounting fixture. Find a suitable position for the fixture and place the measuring pin on the flange. Check the play by shaking in the axial direction with your hand. In this case, there is no axial play. If the bearing is not free of play, increase the initial torque to a maximum of 60 Nm in steps of 10 Nm. If play is still present, the rear axle must be replaced. To make sure that the tapered rollers also run properly in the bearing and line up for adjustment ... turn the drive flange at a speed of roughly one revolution per second ... ... 15 times clockwise and 15 times counterclockwise. Mark the mounting nut in order to first turn it 15 degrees further, half of a 12-point graduation. Turn freely again, 15 times clockwise and 15 times counterclockwise. Mark half of a 12-point graduation again. Then turn the nut another 15 degrees. Align the tapered rollers by freely turning the shaft 15 times in both directions. Check whether the bearing runs with the correct friction resistance. You need the friction value which was recorded during the first measurement. Before the repair, it was 1.4 Nm. The current friction value must be between 0.1 Nm and 0.3 Nm above the initial value noted. A value of 1.6 Nm is measured here, which is within the tolerance. If this is not the case, the rear axle must be replaced. Never turn the mounting nut back to reach the correct friction value. Secure the 12-point nut. The retaining tab must contact the left-hand nut edge against the opening direction. Screw the drive shaft back on. Note: Refill with new transmission oil. Observe the filling capacities of the corresponding axle model designation. Readjust the parking brake and mount the wheels. =========================================================== instagram:   / mbownersclub   twitter:   / mb_owners